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Diffstat (limited to 'src/cairo_gstate.c')
| -rw-r--r-- | src/cairo_gstate.c | 2566 |
1 files changed, 0 insertions, 2566 deletions
diff --git a/src/cairo_gstate.c b/src/cairo_gstate.c deleted file mode 100644 index d6db560a..00000000 --- a/src/cairo_gstate.c +++ /dev/null @@ -1,2566 +0,0 @@ -/* cairo - a vector graphics library with display and print output - * - * Copyright © 2002 University of Southern California - * - * This library is free software; you can redistribute it and/or - * modify it either under the terms of the GNU Lesser General Public - * License version 2.1 as published by the Free Software Foundation - * (the "LGPL") or, at your option, under the terms of the Mozilla - * Public License Version 1.1 (the "MPL"). If you do not alter this - * notice, a recipient may use your version of this file under either - * the MPL or the LGPL. - * - * You should have received a copy of the LGPL along with this library - * in the file COPYING-LGPL-2.1; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * You should have received a copy of the MPL along with this library - * in the file COPYING-MPL-1.1 - * - * The contents of this file are subject to the Mozilla Public License - * Version 1.1 (the "License"); you may not use this file except in - * compliance with the License. You may obtain a copy of the License at - * http://www.mozilla.org/MPL/ - * - * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY - * OF ANY KIND, either express or implied. See the LGPL or the MPL for - * the specific language governing rights and limitations. - * - * The Original Code is the cairo graphics library. - * - * The Initial Developer of the Original Code is University of Southern - * California. - * - * Contributor(s): - * Carl D. Worth <cworth@cworth.org> - */ - -#include <stdlib.h> -#include <math.h> - -#include "cairoint.h" - -static cairo_status_t -_cairo_gstate_clip_and_composite_trapezoids (cairo_gstate_t *gstate, - cairo_pattern_t *src, - cairo_operator_t operator, - cairo_surface_t *dst, - cairo_traps_t *traps); - -static cairo_status_t -_cairo_gstate_ensure_font (cairo_gstate_t *gstate); - -static void -_cairo_gstate_unset_font (cairo_gstate_t *gstate); - -cairo_gstate_t * -_cairo_gstate_create () -{ - cairo_status_t status; - cairo_gstate_t *gstate; - - gstate = malloc (sizeof (cairo_gstate_t)); - - if (gstate) - { - status = _cairo_gstate_init (gstate); - if (status) { - free (gstate); - return NULL; - } - } - - return gstate; -} - -cairo_status_t -_cairo_gstate_init (cairo_gstate_t *gstate) -{ - gstate->operator = CAIRO_GSTATE_OPERATOR_DEFAULT; - - gstate->tolerance = CAIRO_GSTATE_TOLERANCE_DEFAULT; - - gstate->line_width = CAIRO_GSTATE_LINE_WIDTH_DEFAULT; - gstate->line_cap = CAIRO_GSTATE_LINE_CAP_DEFAULT; - gstate->line_join = CAIRO_GSTATE_LINE_JOIN_DEFAULT; - gstate->miter_limit = CAIRO_GSTATE_MITER_LIMIT_DEFAULT; - - gstate->fill_rule = CAIRO_GSTATE_FILL_RULE_DEFAULT; - - gstate->dash = NULL; - gstate->num_dashes = 0; - gstate->dash_offset = 0.0; - - gstate->font_family = NULL; - gstate->font_slant = CAIRO_FONT_SLANT_DEFAULT; - gstate->font_weight = CAIRO_FONT_WEIGHT_DEFAULT; - - gstate->font = NULL; - - gstate->surface = NULL; - - gstate->clip.region = NULL; - gstate->clip.surface = NULL; - - gstate->pattern = _cairo_pattern_create_solid (0.0, 0.0, 0.0); - if (!gstate->pattern) - return CAIRO_STATUS_NO_MEMORY; - - gstate->alpha = 1.0; - - gstate->pixels_per_inch = CAIRO_GSTATE_PIXELS_PER_INCH_DEFAULT; - _cairo_gstate_default_matrix (gstate); - - _cairo_path_init (&gstate->path); - - _cairo_pen_init_empty (&gstate->pen_regular); - - gstate->next = NULL; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_init_copy (cairo_gstate_t *gstate, cairo_gstate_t *other) -{ - cairo_status_t status; - cairo_gstate_t *next; - - /* Copy all members, but don't smash the next pointer */ - next = gstate->next; - *gstate = *other; - gstate->next = next; - - /* Now fix up pointer data that needs to be cloned/referenced */ - if (other->dash) { - gstate->dash = malloc (other->num_dashes * sizeof (double)); - if (gstate->dash == NULL) - return CAIRO_STATUS_NO_MEMORY; - memcpy (gstate->dash, other->dash, other->num_dashes * sizeof (double)); - } - - if (other->font_family) { - gstate->font_family = strdup (other->font_family); - if (!gstate->font_family) - goto CLEANUP_DASH; - } - - if (other->font) { - gstate->font = other->font; - cairo_font_reference (gstate->font); - } - - if (other->clip.region) - { - gstate->clip.region = pixman_region_create (); - pixman_region_copy (gstate->clip.region, other->clip.region); - } - - cairo_surface_reference (gstate->surface); - cairo_surface_reference (gstate->clip.surface); - - cairo_pattern_reference (gstate->pattern); - - status = _cairo_path_init_copy (&gstate->path, &other->path); - if (status) - goto CLEANUP_FONT; - - status = _cairo_pen_init_copy (&gstate->pen_regular, &other->pen_regular); - if (status) - goto CLEANUP_PATH; - - return status; - - CLEANUP_PATH: - _cairo_path_fini (&gstate->path); - - CLEANUP_FONT: - cairo_font_destroy (gstate->font); - gstate->font = NULL; - - if (gstate->font_family) { - free (gstate->font_family); - gstate->font_family = NULL; - } - - CLEANUP_DASH: - free (gstate->dash); - gstate->dash = NULL; - - return CAIRO_STATUS_NO_MEMORY; -} - -void -_cairo_gstate_fini (cairo_gstate_t *gstate) -{ - if (gstate->font_family) - free (gstate->font_family); - - if (gstate->font) - cairo_font_destroy (gstate->font); - - if (gstate->surface) - cairo_surface_destroy (gstate->surface); - gstate->surface = NULL; - - if (gstate->clip.surface) - cairo_surface_destroy (gstate->clip.surface); - gstate->clip.surface = NULL; - - if (gstate->clip.region) - pixman_region_destroy (gstate->clip.region); - gstate->clip.region = NULL; - - cairo_pattern_destroy (gstate->pattern); - - _cairo_matrix_fini (&gstate->font_matrix); - - _cairo_matrix_fini (&gstate->ctm); - _cairo_matrix_fini (&gstate->ctm_inverse); - - _cairo_path_fini (&gstate->path); - - _cairo_pen_fini (&gstate->pen_regular); - - if (gstate->dash) { - free (gstate->dash); - gstate->dash = NULL; - } -} - -void -_cairo_gstate_destroy (cairo_gstate_t *gstate) -{ - _cairo_gstate_fini (gstate); - free (gstate); -} - -cairo_gstate_t* -_cairo_gstate_clone (cairo_gstate_t *gstate) -{ - cairo_status_t status; - cairo_gstate_t *clone; - - clone = malloc (sizeof (cairo_gstate_t)); - if (clone) { - status = _cairo_gstate_init_copy (clone, gstate); - if (status) { - free (clone); - return NULL; - } - } - clone->next = NULL; - - return clone; -} - -cairo_status_t -_cairo_gstate_copy (cairo_gstate_t *dest, cairo_gstate_t *src) -{ - cairo_status_t status; - cairo_gstate_t *next; - - /* Preserve next pointer over fini/init */ - next = dest->next; - _cairo_gstate_fini (dest); - status = _cairo_gstate_init_copy (dest, src); - dest->next = next; - - return status; -} - -/* Push rendering off to an off-screen group. */ -/* XXX: Rethinking this API -cairo_status_t -_cairo_gstate_begin_group (cairo_gstate_t *gstate) -{ - Pixmap pix; - cairo_color_t clear; - unsigned int width, height; - - gstate->parent_surface = gstate->surface; - - width = _cairo_surface_get_width (gstate->surface); - height = _cairo_surface_get_height (gstate->surface); - - pix = XCreatePixmap (gstate->dpy, - _cairo_surface_get_drawable (gstate->surface), - width, height, - _cairo_surface_get_depth (gstate->surface)); - if (pix == 0) - return CAIRO_STATUS_NO_MEMORY; - - gstate->surface = cairo_surface_create (gstate->dpy); - if (gstate->surface == NULL) - return CAIRO_STATUS_NO_MEMORY; - - _cairo_surface_set_drawableWH (gstate->surface, pix, width, height); - - _cairo_color_init (&clear); - _cairo_color_set_alpha (&clear, 0); - - status = _cairo_surface_fill_rectangle (gstate->surface, - CAIRO_OPERATOR_SRC, - &clear, - 0, 0, - _cairo_surface_get_width (gstate->surface), - _cairo_surface_get_height (gstate->surface)); - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} -*/ - -/* Complete the current offscreen group, composing its contents onto the parent surface. */ -/* XXX: Rethinking this API -cairo_status_t -_cairo_gstate_end_group (cairo_gstate_t *gstate) -{ - Pixmap pix; - cairo_color_t mask_color; - cairo_surface_t mask; - - if (gstate->parent_surface == NULL) - return CAIRO_STATUS_INVALID_POP_GROUP; - - _cairo_surface_init (&mask, gstate->dpy); - _cairo_color_init (&mask_color); - _cairo_color_set_alpha (&mask_color, gstate->alpha); - - _cairo_surface_set_solid_color (&mask, &mask_color); - - * XXX: This could be made much more efficient by using - _cairo_surface_get_damaged_width/Height if cairo_surface_t actually kept - track of such informaton. * - _cairo_surface_composite (gstate->operator, - gstate->surface, - mask, - gstate->parent_surface, - 0, 0, - 0, 0, - 0, 0, - _cairo_surface_get_width (gstate->surface), - _cairo_surface_get_height (gstate->surface)); - - _cairo_surface_fini (&mask); - - pix = _cairo_surface_get_drawable (gstate->surface); - XFreePixmap (gstate->dpy, pix); - - cairo_surface_destroy (gstate->surface); - gstate->surface = gstate->parent_surface; - gstate->parent_surface = NULL; - - return CAIRO_STATUS_SUCCESS; -} -*/ - -cairo_status_t -_cairo_gstate_set_target_surface (cairo_gstate_t *gstate, cairo_surface_t *surface) -{ - double scale; - - _cairo_gstate_unset_font (gstate); - - if (gstate->surface) - cairo_surface_destroy (gstate->surface); - - gstate->surface = surface; - - /* Sometimes the user wants to return to having no target surface, - * (just like after cairo_create). This can be useful for forcing - * the old surface to be destroyed. */ - if (surface == NULL) - return CAIRO_STATUS_SUCCESS; - - cairo_surface_reference (gstate->surface); - - scale = _cairo_surface_pixels_per_inch (surface) / gstate->pixels_per_inch; - _cairo_gstate_scale (gstate, scale, scale); - gstate->pixels_per_inch = _cairo_surface_pixels_per_inch (surface); - - return CAIRO_STATUS_SUCCESS; -} - -/* XXX: Need to decide the memory mangement semantics of this - function. Should it reference the surface again? */ -cairo_surface_t * -_cairo_gstate_current_target_surface (cairo_gstate_t *gstate) -{ - if (gstate == NULL) - return NULL; - -/* XXX: Do we want this? - if (gstate->surface) - _cairo_surface_reference (gstate->surface); -*/ - - return gstate->surface; -} - -cairo_status_t -_cairo_gstate_set_pattern (cairo_gstate_t *gstate, cairo_pattern_t *pattern) -{ - if (pattern == NULL) - return CAIRO_STATUS_NULL_POINTER; - - cairo_pattern_reference (pattern); - cairo_pattern_destroy (gstate->pattern); - gstate->pattern = pattern; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_pattern_t * -_cairo_gstate_current_pattern (cairo_gstate_t *gstate) -{ - if (gstate == NULL) - return NULL; - -/* XXX: Do we want this? - cairo_pattern_reference (gstate->pattern); -*/ - - return gstate->pattern; -} - -cairo_status_t -_cairo_gstate_set_operator (cairo_gstate_t *gstate, cairo_operator_t operator) -{ - gstate->operator = operator; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_operator_t -_cairo_gstate_current_operator (cairo_gstate_t *gstate) -{ - return gstate->operator; -} - -cairo_status_t -_cairo_gstate_set_rgb_color (cairo_gstate_t *gstate, double red, double green, double blue) -{ - cairo_pattern_destroy (gstate->pattern); - - gstate->pattern = _cairo_pattern_create_solid (red, green, blue); - if (!gstate->pattern) - return CAIRO_STATUS_NO_MEMORY; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_current_rgb_color (cairo_gstate_t *gstate, double *red, double *green, double *blue) -{ - return _cairo_pattern_get_rgb (gstate->pattern, red, green, blue); -} - -cairo_status_t -_cairo_gstate_set_tolerance (cairo_gstate_t *gstate, double tolerance) -{ - gstate->tolerance = tolerance; - - return CAIRO_STATUS_SUCCESS; -} - -double -_cairo_gstate_current_tolerance (cairo_gstate_t *gstate) -{ - return gstate->tolerance; -} - -cairo_status_t -_cairo_gstate_set_alpha (cairo_gstate_t *gstate, double alpha) -{ - gstate->alpha = alpha; - - return CAIRO_STATUS_SUCCESS; -} - -double -_cairo_gstate_current_alpha (cairo_gstate_t *gstate) -{ - return gstate->alpha; -} - -cairo_status_t -_cairo_gstate_set_fill_rule (cairo_gstate_t *gstate, cairo_fill_rule_t fill_rule) -{ - gstate->fill_rule = fill_rule; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_fill_rule_t -_cairo_gstate_current_fill_rule (cairo_gstate_t *gstate) -{ - return gstate->fill_rule; -} - -cairo_status_t -_cairo_gstate_set_line_width (cairo_gstate_t *gstate, double width) -{ - gstate->line_width = width; - - return CAIRO_STATUS_SUCCESS; -} - -double -_cairo_gstate_current_line_width (cairo_gstate_t *gstate) -{ - return gstate->line_width; -} - -cairo_status_t -_cairo_gstate_set_line_cap (cairo_gstate_t *gstate, cairo_line_cap_t line_cap) -{ - gstate->line_cap = line_cap; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_line_cap_t -_cairo_gstate_current_line_cap (cairo_gstate_t *gstate) -{ - return gstate->line_cap; -} - -cairo_status_t -_cairo_gstate_set_line_join (cairo_gstate_t *gstate, cairo_line_join_t line_join) -{ - gstate->line_join = line_join; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_line_join_t -_cairo_gstate_current_line_join (cairo_gstate_t *gstate) -{ - return gstate->line_join; -} - -cairo_status_t -_cairo_gstate_set_dash (cairo_gstate_t *gstate, double *dash, int num_dashes, double offset) -{ - if (gstate->dash) { - free (gstate->dash); - gstate->dash = NULL; - } - - gstate->num_dashes = num_dashes; - if (gstate->num_dashes) { - gstate->dash = malloc (gstate->num_dashes * sizeof (double)); - if (gstate->dash == NULL) { - gstate->num_dashes = 0; - return CAIRO_STATUS_NO_MEMORY; - } - } - - memcpy (gstate->dash, dash, gstate->num_dashes * sizeof (double)); - gstate->dash_offset = offset; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_set_miter_limit (cairo_gstate_t *gstate, double limit) -{ - gstate->miter_limit = limit; - - return CAIRO_STATUS_SUCCESS; -} - -double -_cairo_gstate_current_miter_limit (cairo_gstate_t *gstate) -{ - return gstate->miter_limit; -} - -void -_cairo_gstate_current_matrix (cairo_gstate_t *gstate, cairo_matrix_t *matrix) -{ - cairo_matrix_copy (matrix, &gstate->ctm); -} - -cairo_status_t -_cairo_gstate_translate (cairo_gstate_t *gstate, double tx, double ty) -{ - cairo_matrix_t tmp; - - _cairo_gstate_unset_font (gstate); - - _cairo_matrix_set_translate (&tmp, tx, ty); - cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); - - _cairo_matrix_set_translate (&tmp, -tx, -ty); - cairo_matrix_multiply (&gstate->ctm_inverse, &gstate->ctm_inverse, &tmp); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_scale (cairo_gstate_t *gstate, double sx, double sy) -{ - cairo_matrix_t tmp; - - if (sx == 0 || sy == 0) - return CAIRO_STATUS_INVALID_MATRIX; - - _cairo_gstate_unset_font (gstate); - - _cairo_matrix_set_scale (&tmp, sx, sy); - cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); - - _cairo_matrix_set_scale (&tmp, 1/sx, 1/sy); - cairo_matrix_multiply (&gstate->ctm_inverse, &gstate->ctm_inverse, &tmp); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_rotate (cairo_gstate_t *gstate, double angle) -{ - cairo_matrix_t tmp; - - _cairo_gstate_unset_font (gstate); - - _cairo_matrix_set_rotate (&tmp, angle); - cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); - - _cairo_matrix_set_rotate (&tmp, -angle); - cairo_matrix_multiply (&gstate->ctm_inverse, &gstate->ctm_inverse, &tmp); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_concat_matrix (cairo_gstate_t *gstate, - cairo_matrix_t *matrix) -{ - cairo_matrix_t tmp; - - _cairo_gstate_unset_font (gstate); - - cairo_matrix_copy (&tmp, matrix); - cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); - - cairo_matrix_invert (&tmp); - cairo_matrix_multiply (&gstate->ctm_inverse, &gstate->ctm_inverse, &tmp); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_set_matrix (cairo_gstate_t *gstate, - cairo_matrix_t *matrix) -{ - cairo_status_t status; - - _cairo_gstate_unset_font (gstate); - - cairo_matrix_copy (&gstate->ctm, matrix); - - cairo_matrix_copy (&gstate->ctm_inverse, matrix); - status = cairo_matrix_invert (&gstate->ctm_inverse); - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_default_matrix (cairo_gstate_t *gstate) -{ - int scale = gstate->pixels_per_inch / CAIRO_GSTATE_PIXELS_PER_INCH_DEFAULT + 0.5; - if (scale == 0) - scale = 1; - - _cairo_gstate_unset_font (gstate); - - cairo_matrix_set_identity (&gstate->font_matrix); - - cairo_matrix_set_identity (&gstate->ctm); - cairo_matrix_scale (&gstate->ctm, scale, scale); - cairo_matrix_copy (&gstate->ctm_inverse, &gstate->ctm); - cairo_matrix_invert (&gstate->ctm_inverse); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_identity_matrix (cairo_gstate_t *gstate) -{ - _cairo_gstate_unset_font (gstate); - - cairo_matrix_set_identity (&gstate->ctm); - cairo_matrix_set_identity (&gstate->ctm_inverse); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_transform_point (cairo_gstate_t *gstate, double *x, double *y) -{ - cairo_matrix_transform_point (&gstate->ctm, x, y); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_transform_distance (cairo_gstate_t *gstate, double *dx, double *dy) -{ - cairo_matrix_transform_distance (&gstate->ctm, dx, dy); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_inverse_transform_point (cairo_gstate_t *gstate, double *x, double *y) -{ - cairo_matrix_transform_point (&gstate->ctm_inverse, x, y); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_inverse_transform_distance (cairo_gstate_t *gstate, double *dx, double *dy) -{ - cairo_matrix_transform_distance (&gstate->ctm_inverse, dx, dy); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_new_path (cairo_gstate_t *gstate) -{ - _cairo_path_fini (&gstate->path); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_move_to (cairo_gstate_t *gstate, double x, double y) -{ - cairo_point_t point; - - cairo_matrix_transform_point (&gstate->ctm, &x, &y); - - point.x = _cairo_fixed_from_double (x); - point.y = _cairo_fixed_from_double (y); - - return _cairo_path_move_to (&gstate->path, &point); -} - -cairo_status_t -_cairo_gstate_line_to (cairo_gstate_t *gstate, double x, double y) -{ - cairo_point_t point; - - cairo_matrix_transform_point (&gstate->ctm, &x, &y); - - point.x = _cairo_fixed_from_double (x); - point.y = _cairo_fixed_from_double (y); - - return _cairo_path_line_to (&gstate->path, &point); -} - -cairo_status_t -_cairo_gstate_curve_to (cairo_gstate_t *gstate, - double x0, double y0, - double x1, double y1, - double x2, double y2) -{ - cairo_point_t p0, p1, p2; - - cairo_matrix_transform_point (&gstate->ctm, &x0, &y0); - cairo_matrix_transform_point (&gstate->ctm, &x1, &y1); - cairo_matrix_transform_point (&gstate->ctm, &x2, &y2); - - p0.x = _cairo_fixed_from_double (x0); - p0.y = _cairo_fixed_from_double (y0); - - p1.x = _cairo_fixed_from_double (x1); - p1.y = _cairo_fixed_from_double (y1); - - p2.x = _cairo_fixed_from_double (x2); - p2.y = _cairo_fixed_from_double (y2); - - return _cairo_path_curve_to (&gstate->path, &p0, &p1, &p2); -} - -/* Spline deviation from the circle in radius would be given by: - - error = sqrt (x**2 + y**2) - 1 - - A simpler error function to work with is: - - e = x**2 + y**2 - 1 - - From "Good approximation of circles by curvature-continuous Bezier - curves", Tor Dokken and Morten Daehlen, Computer Aided Geometric - Design 8 (1990) 22-41, we learn: - - abs (max(e)) = 4/27 * sin**6(angle/4) / cos**2(angle/4) - - and - abs (error) =~ 1/2 * e - - Of course, this error value applies only for the particular spline - approximation that is used in _cairo_gstate_arc_segment. -*/ -static double -_arc_error_normalized (double angle) -{ - return 2.0/27.0 * pow (sin (angle / 4), 6) / pow (cos (angle / 4), 2); -} - -static double -_arc_max_angle_for_tolerance_normalized (double tolerance) -{ - double angle, error; - int i; - - /* Use table lookup to reduce search time in most cases. */ - struct { - double angle; - double error; - } table[] = { - { M_PI / 1.0, 0.0185185185185185036127 }, - { M_PI / 2.0, 0.000272567143730179811158 }, - { M_PI / 3.0, 2.38647043651461047433e-05 }, - { M_PI / 4.0, 4.2455377443222443279e-06 }, - { M_PI / 5.0, 1.11281001494389081528e-06 }, - { M_PI / 6.0, 3.72662000942734705475e-07 }, - { M_PI / 7.0, 1.47783685574284411325e-07 }, - { M_PI / 8.0, 6.63240432022601149057e-08 }, - { M_PI / 9.0, 3.2715520137536980553e-08 }, - { M_PI / 10.0, 1.73863223499021216974e-08 }, - { M_PI / 11.0, 9.81410988043554039085e-09 }, - }; - int table_size = (sizeof (table) / sizeof (table[0])); - - for (i = 0; i < table_size; i++) - if (table[i].error < tolerance) - return table[i].angle; - - ++i; - do { - angle = M_PI / i++; - error = _arc_error_normalized (angle); - } while (error > tolerance); - - return angle; -} - -static int -_cairo_gstate_arc_segments_needed (cairo_gstate_t *gstate, - double angle, - double radius) -{ - double l1, l2, lmax; - double max_angle; - - _cairo_matrix_compute_eigen_values (&gstate->ctm, &l1, &l2); - - l1 = fabs (l1); - l2 = fabs (l2); - if (l1 > l2) - lmax = l1; - else - lmax = l2; - - max_angle = _arc_max_angle_for_tolerance_normalized (gstate->tolerance / (radius * lmax)); - - return (int) ceil (angle / max_angle); -} - -/* We want to draw a single spline approximating a circular arc radius - R from angle A to angle B. Since we want a symmetric spline that - matches the endpoints of the arc in position and slope, we know - that the spline control points must be: - - (R * cos(A), R * sin(A)) - (R * cos(A) - h * sin(A), R * sin(A) + h * cos (A)) - (R * cos(B) + h * sin(B), R * sin(B) - h * cos (B)) - (R * cos(B), R * sin(B)) - - for some value of h. - - "Approximation of circular arcs by cubic poynomials", Michael - Goldapp, Computer Aided Geometric Design 8 (1991) 227-238, provides - various values of h along with error analysis for each. - - From that paper, a very practical value of h is: - - h = 4/3 * tan(angle/4) - - This value does not give the spline with minimal error, but it does - provide a very good approximation, (6th-order convergence), and the - error expression is quite simple, (see the comment for - _arc_error_normalized). -*/ -static cairo_status_t -_cairo_gstate_arc_segment (cairo_gstate_t *gstate, - double xc, double yc, - double radius, - double angle_A, double angle_B) -{ - cairo_status_t status; - double r_sin_A, r_cos_A; - double r_sin_B, r_cos_B; - double h; - - r_sin_A = radius * sin (angle_A); - r_cos_A = radius * cos (angle_A); - r_sin_B = radius * sin (angle_B); - r_cos_B = radius * cos (angle_B); - - h = 4.0/3.0 * tan ((angle_B - angle_A) / 4.0); - - status = _cairo_gstate_curve_to (gstate, - xc + r_cos_A - h * r_sin_A, yc + r_sin_A + h * r_cos_A, - xc + r_cos_B + h * r_sin_B, yc + r_sin_B - h * r_cos_B, - xc + r_cos_B, yc + r_sin_B); - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -_cairo_gstate_arc_dir (cairo_gstate_t *gstate, - double xc, double yc, - double radius, - double angle_min, - double angle_max, - cairo_direction_t dir) -{ - cairo_status_t status; - - while (angle_max - angle_min > 4 * M_PI) - angle_max -= 2 * M_PI; - - /* Recurse if drawing arc larger than pi */ - if (angle_max - angle_min > M_PI) { - double angle_mid = angle_min + (angle_max - angle_min) / 2.0; - /* XXX: Something tells me this block could be condensed. */ - if (dir == CAIRO_DIRECTION_FORWARD) { - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle_min, angle_mid, dir); - if (status) - return status; - - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle_mid, angle_max, dir); - if (status) - return status; - } else { - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle_mid, angle_max, dir); - if (status) - return status; - - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle_min, angle_mid, dir); - if (status) - return status; - } - } else { - int i, segments; - double angle, angle_step; - - segments = _cairo_gstate_arc_segments_needed (gstate, - angle_max - angle_min, - radius); - angle_step = (angle_max - angle_min) / (double) segments; - - if (dir == CAIRO_DIRECTION_FORWARD) { - angle = angle_min; - } else { - angle = angle_max; - angle_step = - angle_step; - } - - for (i = 0; i < segments; i++, angle += angle_step) { - _cairo_gstate_arc_segment (gstate, - xc, yc, - radius, - angle, - angle + angle_step); - } - - } - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_arc (cairo_gstate_t *gstate, - double xc, double yc, - double radius, - double angle1, double angle2) -{ - cairo_status_t status; - - if (radius <= 0.0) - return CAIRO_STATUS_SUCCESS; - - while (angle2 < angle1) - angle2 += 2 * M_PI; - - status = _cairo_gstate_line_to (gstate, - xc + radius * cos (angle1), - yc + radius * sin (angle1)); - if (status) - return status; - - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle1, angle2, CAIRO_DIRECTION_FORWARD); - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_arc_negative (cairo_gstate_t *gstate, - double xc, double yc, - double radius, - double angle1, double angle2) -{ - cairo_status_t status; - - if (radius <= 0.0) - return CAIRO_STATUS_SUCCESS; - - while (angle2 > angle1) - angle2 -= 2 * M_PI; - - status = _cairo_gstate_line_to (gstate, - xc + radius * cos (angle1), - yc + radius * sin (angle1)); - if (status) - return status; - - status = _cairo_gstate_arc_dir (gstate, xc, yc, radius, - angle2, angle1, CAIRO_DIRECTION_REVERSE); - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} - -/* XXX: NYI -cairo_status_t -_cairo_gstate_arc_to (cairo_gstate_t *gstate, - double x1, double y1, - double x2, double y2, - double radius) -{ - -} -*/ - -cairo_status_t -_cairo_gstate_rel_move_to (cairo_gstate_t *gstate, double dx, double dy) -{ - cairo_distance_t distance; - - cairo_matrix_transform_distance (&gstate->ctm, &dx, &dy); - - distance.dx = _cairo_fixed_from_double (dx); - distance.dy = _cairo_fixed_from_double (dy); - - return _cairo_path_rel_move_to (&gstate->path, &distance); -} - -cairo_status_t -_cairo_gstate_rel_line_to (cairo_gstate_t *gstate, double dx, double dy) -{ - cairo_distance_t distance; - - cairo_matrix_transform_distance (&gstate->ctm, &dx, &dy); - - distance.dx = _cairo_fixed_from_double (dx); - distance.dy = _cairo_fixed_from_double (dy); - - return _cairo_path_rel_line_to (&gstate->path, &distance); -} - -cairo_status_t -_cairo_gstate_rel_curve_to (cairo_gstate_t *gstate, - double dx0, double dy0, - double dx1, double dy1, - double dx2, double dy2) -{ - cairo_distance_t distance[3]; - - cairo_matrix_transform_distance (&gstate->ctm, &dx0, &dy0); - cairo_matrix_transform_distance (&gstate->ctm, &dx1, &dy1); - cairo_matrix_transform_distance (&gstate->ctm, &dx2, &dy2); - - distance[0].dx = _cairo_fixed_from_double (dx0); - distance[0].dy = _cairo_fixed_from_double (dy0); - - distance[1].dx = _cairo_fixed_from_double (dx1); - distance[1].dy = _cairo_fixed_from_double (dy1); - - distance[2].dx = _cairo_fixed_from_double (dx2); - distance[2].dy = _cairo_fixed_from_double (dy2); - - return _cairo_path_rel_curve_to (&gstate->path, - &distance[0], - &distance[1], - &distance[2]); -} - -/* XXX: NYI -cairo_status_t -_cairo_gstate_stroke_path (cairo_gstate_t *gstate) -{ - cairo_status_t status; - - _cairo_pen_init (&gstate); - return CAIRO_STATUS_SUCCESS; -} -*/ - -cairo_status_t -_cairo_gstate_close_path (cairo_gstate_t *gstate) -{ - return _cairo_path_close_path (&gstate->path); -} - -cairo_status_t -_cairo_gstate_current_point (cairo_gstate_t *gstate, double *x_ret, double *y_ret) -{ - cairo_status_t status; - cairo_point_t point; - double x, y; - - status = _cairo_path_current_point (&gstate->path, &point); - if (status == CAIRO_STATUS_NO_CURRENT_POINT) { - x = 0.0; - y = 0.0; - } else { - x = _cairo_fixed_to_double (point.x); - y = _cairo_fixed_to_double (point.y); - cairo_matrix_transform_point (&gstate->ctm_inverse, &x, &y); - } - - if (x_ret) - *x_ret = x; - if (y_ret) - *y_ret = y; - - return CAIRO_STATUS_SUCCESS; -} - -typedef struct gstate_path_interpreter { - cairo_matrix_t ctm_inverse; - double tolerance; - cairo_point_t current_point; - - cairo_move_to_func_t *move_to; - cairo_line_to_func_t *line_to; - cairo_curve_to_func_t *curve_to; - cairo_close_path_func_t *close_path; - - void *closure; -} gpi_t; - -static cairo_status_t -_gpi_move_to (void *closure, cairo_point_t *point) -{ - gpi_t *gpi = closure; - double x, y; - - x = _cairo_fixed_to_double (point->x); - y = _cairo_fixed_to_double (point->y); - - cairo_matrix_transform_point (&gpi->ctm_inverse, &x, &y); - - gpi->move_to (gpi->closure, x, y); - gpi->current_point = *point; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -_gpi_line_to (void *closure, cairo_point_t *point) -{ - gpi_t *gpi = closure; - double x, y; - - x = _cairo_fixed_to_double (point->x); - y = _cairo_fixed_to_double (point->y); - - cairo_matrix_transform_point (&gpi->ctm_inverse, &x, &y); - - gpi->line_to (gpi->closure, x, y); - gpi->current_point = *point; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -_gpi_curve_to (void *closure, - cairo_point_t *p1, - cairo_point_t *p2, - cairo_point_t *p3) -{ - gpi_t *gpi = closure; - cairo_status_t status; - cairo_spline_t spline; - double x1, y1, x2, y2, x3, y3; - - if (gpi->curve_to) { - x1 = _cairo_fixed_to_double (p1->x); - y1 = _cairo_fixed_to_double (p1->y); - cairo_matrix_transform_point (&gpi->ctm_inverse, &x1, &y1); - - x2 = _cairo_fixed_to_double (p2->x); - y2 = _cairo_fixed_to_double (p2->y); - cairo_matrix_transform_point (&gpi->ctm_inverse, &x2, &y2); - - x3 = _cairo_fixed_to_double (p3->x); - y3 = _cairo_fixed_to_double (p3->y); - cairo_matrix_transform_point (&gpi->ctm_inverse, &x3, &y3); - - gpi->curve_to (gpi->closure, x1, y1, x2, y2, x3, y3); - } else { - cairo_point_t *p0 = &gpi->current_point; - int i; - double x, y; - - status = _cairo_spline_init (&spline, p0, p1, p2, p3); - if (status == CAIRO_INT_STATUS_DEGENERATE) - return CAIRO_STATUS_SUCCESS; - - status = _cairo_spline_decompose (&spline, gpi->tolerance); - if (status) - return status; - - for (i=1; i < spline.num_points; i++) { - x = _cairo_fixed_to_double (spline.points[i].x); - y = _cairo_fixed_to_double (spline.points[i].y); - - cairo_matrix_transform_point (&gpi->ctm_inverse, &x, &y); - - gpi->line_to (gpi->closure, x, y); - } - } - - gpi->current_point = *p3; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -_gpi_close_path (void *closure) -{ - gpi_t *gpi = closure; - - gpi->close_path (gpi->closure); - - gpi->current_point.x = 0; - gpi->current_point.y = 0; - - return CAIRO_STATUS_SUCCESS; -} - -/* It's OK for curve_path to be NULL. In that case, all curves in the - path will be decomposed into one or more calls to the line_to - function, (according to the current tolerance). */ -cairo_status_t -_cairo_gstate_interpret_path (cairo_gstate_t *gstate, - cairo_move_to_func_t *move_to, - cairo_line_to_func_t *line_to, - cairo_curve_to_func_t *curve_to, - cairo_close_path_func_t *close_path, - void *closure) -{ - cairo_path_t path; - gpi_t gpi; - - /* Anything we want from gstate must be copied. We must not retain - pointers into gstate. */ - _cairo_path_init_copy (&path, &gstate->path); - - cairo_matrix_copy (&gpi.ctm_inverse, &gstate->ctm_inverse); - gpi.tolerance = gstate->tolerance; - - gpi.move_to = move_to; - gpi.line_to = line_to; - gpi.curve_to = curve_to; - gpi.close_path = close_path; - gpi.closure = closure; - - gpi.current_point.x = 0; - gpi.current_point.y = 0; - - return _cairo_path_interpret (&path, - CAIRO_DIRECTION_FORWARD, - _gpi_move_to, - _gpi_line_to, - _gpi_curve_to, - _gpi_close_path, - &gpi); -} - -/* XXX: gstate->alpha will be going away before too long, and when it - * does, it may make sense for this function to just disappear. - */ -static void -_cairo_gstate_pattern_init_copy (cairo_gstate_t *gstate, - cairo_pattern_union_t *pattern, - cairo_pattern_t *src) -{ - _cairo_pattern_init_copy (&pattern->base, src); - _cairo_pattern_transform (&pattern->base, &gstate->ctm_inverse); - _cairo_pattern_set_alpha (&pattern->base, gstate->alpha); -} - -cairo_status_t -_cairo_gstate_stroke (cairo_gstate_t *gstate) -{ - cairo_status_t status; - cairo_traps_t traps; - - if (gstate->line_width <= 0.0) - return CAIRO_STATUS_SUCCESS; - - _cairo_pen_init (&gstate->pen_regular, gstate->line_width / 2.0, gstate); - - _cairo_traps_init (&traps); - - status = _cairo_path_stroke_to_traps (&gstate->path, gstate, &traps); - if (status) { - _cairo_traps_fini (&traps); - return status; - } - - _cairo_gstate_clip_and_composite_trapezoids (gstate, - gstate->pattern, - gstate->operator, - gstate->surface, - &traps); - - _cairo_traps_fini (&traps); - - _cairo_gstate_new_path (gstate); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_in_stroke (cairo_gstate_t *gstate, - double x, - double y, - cairo_bool_t *inside_ret) -{ - cairo_status_t status = CAIRO_STATUS_SUCCESS; - cairo_traps_t traps; - - cairo_matrix_transform_point (&gstate->ctm, &x, &y); - - _cairo_pen_init (&gstate->pen_regular, gstate->line_width / 2.0, gstate); - - _cairo_traps_init (&traps); - - status = _cairo_path_stroke_to_traps (&gstate->path, gstate, &traps); - if (status) - goto BAIL; - - *inside_ret = _cairo_traps_contain (&traps, x, y); - -BAIL: - _cairo_traps_fini (&traps); - - return status; -} - -/* XXX We currently have a confusing mix of boxes and rectangles as - * exemplified by this function. A cairo_box_t is a rectangular area - * represented by the coordinates of the upper left and lower right - * corners, expressed in fixed point numbers. A cairo_rectangle_t is - * also a rectangular area, but represented by the upper left corner - * and the width and the height, as integer numbers. - * - * This function converts a cairo_box_t to a cairo_rectangle_t by - * increasing the area to the nearest integer coordinates. We should - * standardize on cairo_rectangle_t and cairo_rectangle_fixed_t, and - * this function could be renamed to the more reasonable - * _cairo_rectangle_fixed_round. - */ - -static void -_cairo_box_round_to_rectangle (cairo_box_t *box, cairo_rectangle_t *rectangle) -{ - rectangle->x = _cairo_fixed_integer_floor (box->p1.x); - rectangle->y = _cairo_fixed_integer_floor (box->p1.y); - rectangle->width = _cairo_fixed_integer_ceil (box->p2.x) - rectangle->x; - rectangle->height = _cairo_fixed_integer_ceil (box->p2.y) - rectangle->y; -} - -static void -_cairo_rectangle_intersect (cairo_rectangle_t *dest, cairo_rectangle_t *src) -{ - int x1, y1, x2, y2; - - x1 = MAX (dest->x, src->x); - y1 = MAX (dest->y, src->y); - x2 = MIN (dest->x + dest->width, src->x + src->width); - y2 = MIN (dest->y + dest->height, src->y + src->height); - - if (x1 >= x2 || y1 >= y2) { - dest->x = 0; - dest->y = 0; - dest->width = 0; - dest->height = 0; - } else { - dest->x = x1; - dest->y = y1; - dest->width = x2 - x1; - dest->height = y2 - y1; - } -} - -static int -_cairo_rectangle_empty (cairo_rectangle_t *rect) -{ - return rect->width == 0 || rect->height == 0; -} - -static void -translate_traps (cairo_traps_t *traps, int x, int y) -{ - cairo_fixed_t xoff, yoff; - cairo_trapezoid_t *t; - int i; - - /* Ugh. The cairo_composite/(Render) interface doesn't allow - an offset for the trapezoids. Need to manually shift all - the coordinates to align with the offset origin of the - intermediate surface. */ - - xoff = _cairo_fixed_from_int (x); - yoff = _cairo_fixed_from_int (y); - - for (i = 0, t = traps->traps; i < traps->num_traps; i++, t++) { - t->top += yoff; - t->bottom += yoff; - t->left.p1.x += xoff; - t->left.p1.y += yoff; - t->left.p2.x += xoff; - t->left.p2.y += yoff; - t->right.p1.x += xoff; - t->right.p1.y += yoff; - t->right.p2.x += xoff; - t->right.p2.y += yoff; - } -} - - -/* Warning: This call modifies the coordinates of traps */ -static cairo_status_t -_cairo_gstate_clip_and_composite_trapezoids (cairo_gstate_t *gstate, - cairo_pattern_t *src, - cairo_operator_t operator, - cairo_surface_t *dst, - cairo_traps_t *traps) -{ - cairo_status_t status; - cairo_pattern_union_t pattern; - cairo_rectangle_t extents; - cairo_box_t trap_extents; - - if (traps->num_traps == 0) - return CAIRO_STATUS_SUCCESS; - - if (gstate->surface == NULL) - return CAIRO_STATUS_NO_TARGET_SURFACE; - - _cairo_traps_extents (traps, &trap_extents); - _cairo_box_round_to_rectangle (&trap_extents, &extents); - - if (gstate->clip.surface) { - cairo_surface_t *intermediate; - cairo_surface_pattern_t intermediate_pattern; - cairo_color_t empty_color; - - _cairo_rectangle_intersect (&extents, &gstate->clip.rect); - - if (_cairo_rectangle_empty (&extents)) { - status = CAIRO_STATUS_SUCCESS; - goto BAIL1; - } - - translate_traps (traps, -extents.x, -extents.y); - - _cairo_color_init (&empty_color); - _cairo_color_set_alpha (&empty_color, 0.); - intermediate = _cairo_surface_create_similar_solid (gstate->clip.surface, - CAIRO_FORMAT_A8, - extents.width, - extents.height, - &empty_color); - if (intermediate == NULL) { - status = CAIRO_STATUS_NO_MEMORY; - goto BAIL1; - } - - _cairo_pattern_init_solid (&pattern.solid, 1.0, 1.0, 1.0); - - status = _cairo_surface_composite_trapezoids (CAIRO_OPERATOR_ADD, - &pattern.base, - intermediate, - extents.x, extents.y, - 0, 0, - extents.width, - extents.height, - traps->traps, - traps->num_traps); - _cairo_pattern_fini (&pattern.base); - - if (status) - goto BAIL2; - - - _cairo_pattern_init_for_surface (&pattern.surface, - gstate->clip.surface); - - status = _cairo_surface_composite (CAIRO_OPERATOR_IN, - &pattern.base, - NULL, - intermediate, - extents.x - gstate->clip.rect.x, - extents.y - gstate->clip.rect.y, - 0, 0, - 0, 0, - extents.width, extents.height); - _cairo_pattern_fini (&pattern.base); - - if (status) - goto BAIL2; - - _cairo_pattern_init_for_surface (&intermediate_pattern, intermediate); - _cairo_gstate_pattern_init_copy (gstate, &pattern, src); - - status = _cairo_surface_composite (operator, - &pattern.base, - &intermediate_pattern.base, - dst, - extents.x, extents.y, - 0, 0, - extents.x, extents.y, - extents.width, extents.height); - - _cairo_pattern_fini (&pattern.base); - _cairo_pattern_fini (&intermediate_pattern.base); - - BAIL2: - cairo_surface_destroy (intermediate); - BAIL1: - - if (status) - return status; - - } else { - if (gstate->clip.region) { - pixman_box16_t box; - pixman_box16_t *intersection_extents; - pixman_region16_t *rect, *intersection; - - box.x1 = _cairo_fixed_integer_floor (trap_extents.p1.x); - box.y1 = _cairo_fixed_integer_floor (trap_extents.p1.y); - box.x2 = _cairo_fixed_integer_ceil (trap_extents.p2.x); - box.y2 = _cairo_fixed_integer_ceil (trap_extents.p2.y); - - rect = pixman_region_create_simple (&box); - if (rect == NULL) - goto bail1; - intersection = pixman_region_create(); - if (intersection == NULL) - goto bail2; - - if (pixman_region_intersect (intersection, gstate->clip.region, - rect) != PIXMAN_REGION_STATUS_SUCCESS) - goto bail3; - intersection_extents = pixman_region_extents (intersection); - - extents.x = intersection_extents->x1; - extents.y = intersection_extents->y1; - extents.width = intersection_extents->x2 - intersection_extents->x1; - extents.height = intersection_extents->y2 - intersection_extents->y1; - bail3: - pixman_region_destroy (intersection); - bail2: - pixman_region_destroy (rect); - bail1: - ; - } - - _cairo_gstate_pattern_init_copy (gstate, &pattern, src); - - status = _cairo_surface_composite_trapezoids (gstate->operator, - &pattern.base, dst, - extents.x, extents.y, - extents.x, extents.y, - extents.width, - extents.height, - traps->traps, - traps->num_traps); - - _cairo_pattern_fini (&pattern.base); - - if (status) - return status; - } - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_fill (cairo_gstate_t *gstate) -{ - cairo_status_t status; - cairo_traps_t traps; - - _cairo_traps_init (&traps); - - status = _cairo_path_fill_to_traps (&gstate->path, gstate, &traps); - if (status) { - _cairo_traps_fini (&traps); - return status; - } - - _cairo_gstate_clip_and_composite_trapezoids (gstate, - gstate->pattern, - gstate->operator, - gstate->surface, - &traps); - - _cairo_traps_fini (&traps); - - _cairo_gstate_new_path (gstate); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_in_fill (cairo_gstate_t *gstate, - double x, - double y, - cairo_bool_t *inside_ret) -{ - cairo_status_t status = CAIRO_STATUS_SUCCESS; - cairo_traps_t traps; - - cairo_matrix_transform_point (&gstate->ctm, &x, &y); - - _cairo_traps_init (&traps); - - status = _cairo_path_fill_to_traps (&gstate->path, gstate, &traps); - if (status) - goto BAIL; - - *inside_ret = _cairo_traps_contain (&traps, x, y); - -BAIL: - _cairo_traps_fini (&traps); - - return status; -} - -cairo_status_t -_cairo_gstate_copy_page (cairo_gstate_t *gstate) -{ - if (gstate->surface == NULL) - return CAIRO_STATUS_NO_TARGET_SURFACE; - - return _cairo_surface_copy_page (gstate->surface); -} - -cairo_status_t -_cairo_gstate_show_page (cairo_gstate_t *gstate) -{ - if (gstate->surface == NULL) - return CAIRO_STATUS_NO_TARGET_SURFACE; - - return _cairo_surface_show_page (gstate->surface); -} - -cairo_status_t -_cairo_gstate_stroke_extents (cairo_gstate_t *gstate, - double *x1, double *y1, - double *x2, double *y2) -{ - cairo_status_t status; - cairo_traps_t traps; - cairo_box_t extents; - - _cairo_traps_init (&traps); - - status = _cairo_path_stroke_to_traps (&gstate->path, gstate, &traps); - if (status) - goto BAIL; - - _cairo_traps_extents (&traps, &extents); - - *x1 = _cairo_fixed_to_double (extents.p1.x); - *y1 = _cairo_fixed_to_double (extents.p1.y); - *x2 = _cairo_fixed_to_double (extents.p2.x); - *y2 = _cairo_fixed_to_double (extents.p2.y); - - cairo_matrix_transform_point (&gstate->ctm_inverse, x1, y1); - cairo_matrix_transform_point (&gstate->ctm_inverse, x2, y2); - -BAIL: - _cairo_traps_fini (&traps); - - return status; -} - -cairo_status_t -_cairo_gstate_fill_extents (cairo_gstate_t *gstate, - double *x1, double *y1, - double *x2, double *y2) -{ - cairo_status_t status; - cairo_traps_t traps; - cairo_box_t extents; - - _cairo_traps_init (&traps); - - status = _cairo_path_fill_to_traps (&gstate->path, gstate, &traps); - if (status) - goto BAIL; - - _cairo_traps_extents (&traps, &extents); - - *x1 = _cairo_fixed_to_double (extents.p1.x); - *y1 = _cairo_fixed_to_double (extents.p1.y); - *x2 = _cairo_fixed_to_double (extents.p2.x); - *y2 = _cairo_fixed_to_double (extents.p2.y); - - cairo_matrix_transform_point (&gstate->ctm_inverse, x1, y1); - cairo_matrix_transform_point (&gstate->ctm_inverse, x2, y2); - -BAIL: - _cairo_traps_fini (&traps); - - return status; -} - -cairo_status_t -_cairo_gstate_init_clip (cairo_gstate_t *gstate) -{ - /* destroy any existing clip-region artifacts */ - if (gstate->clip.surface) - cairo_surface_destroy (gstate->clip.surface); - gstate->clip.surface = NULL; - - if (gstate->clip.region) - pixman_region_destroy (gstate->clip.region); - gstate->clip.region = NULL; - - /* reset the surface's clip to the whole surface */ - if (gstate->surface) - _cairo_surface_set_clip_region (gstate->surface, - gstate->clip.region); - - return CAIRO_STATUS_SUCCESS; -} - -static int -extract_transformed_rectangle(cairo_matrix_t *mat, - cairo_traps_t *tr, - pixman_box16_t *box) -{ - double a, b, c, d, tx, ty; - cairo_status_t st; - - st = cairo_matrix_get_affine (mat, &a, &b, &c, &d, &tx, &ty); - if (!(st == CAIRO_STATUS_SUCCESS && b == 0. && c == 0.)) - return 0; - - if (tr->num_traps == 1 - && tr->traps[0].left.p1.x == tr->traps[0].left.p2.x - && tr->traps[0].right.p1.x == tr->traps[0].right.p2.x - && tr->traps[0].left.p1.y == tr->traps[0].right.p1.y - && tr->traps[0].left.p2.y == tr->traps[0].right.p2.y - && _cairo_fixed_is_integer(tr->traps[0].left.p1.x) - && _cairo_fixed_is_integer(tr->traps[0].left.p1.y) - && _cairo_fixed_is_integer(tr->traps[0].left.p2.x) - && _cairo_fixed_is_integer(tr->traps[0].left.p2.y) - && _cairo_fixed_is_integer(tr->traps[0].right.p1.x) - && _cairo_fixed_is_integer(tr->traps[0].right.p1.y) - && _cairo_fixed_is_integer(tr->traps[0].right.p2.x) - && _cairo_fixed_is_integer(tr->traps[0].right.p2.y)) { - - box->x1 = (short) _cairo_fixed_integer_part(tr->traps[0].left.p1.x); - box->x2 = (short) _cairo_fixed_integer_part(tr->traps[0].right.p1.x); - box->y1 = (short) _cairo_fixed_integer_part(tr->traps[0].left.p1.y); - box->y2 = (short) _cairo_fixed_integer_part(tr->traps[0].left.p2.y); - return 1; - } - return 0; -} - -/* Reset surface clip region to the one in the gstate */ -cairo_status_t -_cairo_gstate_restore_external_state (cairo_gstate_t *gstate) -{ - cairo_status_t status; - - status = CAIRO_STATUS_SUCCESS; - - if (gstate->surface) - status = _cairo_surface_set_clip_region (gstate->surface, - gstate->clip.region); - - /* If not supported we're already using surface clipping */ - if (status == CAIRO_INT_STATUS_UNSUPPORTED) - status = CAIRO_STATUS_SUCCESS; - - return status; -} - -cairo_status_t -_cairo_gstate_clip (cairo_gstate_t *gstate) -{ - cairo_status_t status; - cairo_pattern_union_t pattern; - cairo_traps_t traps; - cairo_color_t white_color; - cairo_box_t extents; - pixman_box16_t box; - - /* Fill the clip region as traps. */ - - _cairo_traps_init (&traps); - status = _cairo_path_fill_to_traps (&gstate->path, gstate, &traps); - if (status) { - _cairo_traps_fini (&traps); - return status; - } - - /* Check to see if we can represent these traps as a PixRegion. */ - - if (extract_transformed_rectangle (&gstate->ctm, &traps, &box)) { - - pixman_region16_t *rect = NULL; - pixman_region16_t *intersection = NULL; - - status = CAIRO_STATUS_SUCCESS; - rect = pixman_region_create_simple (&box); - - if (rect == NULL) { - status = CAIRO_STATUS_NO_MEMORY; - - } else { - - if (gstate->clip.region == NULL) { - gstate->clip.region = rect; - } else { - intersection = pixman_region_create(); - if (pixman_region_intersect (intersection, - gstate->clip.region, rect) - == PIXMAN_REGION_STATUS_SUCCESS) { - pixman_region_destroy (gstate->clip.region); - gstate->clip.region = intersection; - } else { - status = CAIRO_STATUS_NO_MEMORY; - } - pixman_region_destroy (rect); - } - - if (!status) - status = _cairo_surface_set_clip_region (gstate->surface, - gstate->clip.region); - } - - if (status != CAIRO_INT_STATUS_UNSUPPORTED) { - _cairo_traps_fini (&traps); - return status; - } - - /* Fall through as status == CAIRO_INT_STATUS_UNSUPPORTED - means that backend doesn't support clipping regions and - mask surface clipping should be used instead. */ - } - - /* Otherwise represent the clip as a mask surface. */ - - _cairo_color_init (&white_color); - - if (gstate->clip.surface == NULL) { - _cairo_traps_extents (&traps, &extents); - _cairo_box_round_to_rectangle (&extents, &gstate->clip.rect); - gstate->clip.surface = - _cairo_surface_create_similar_solid (gstate->surface, - CAIRO_FORMAT_A8, - gstate->clip.rect.width, - gstate->clip.rect.height, - &white_color); - if (gstate->clip.surface == NULL) - return CAIRO_STATUS_NO_MEMORY; - } - - translate_traps (&traps, -gstate->clip.rect.x, -gstate->clip.rect.y); - _cairo_pattern_init_solid (&pattern.solid, 1.0, 1.0, 1.0); - - status = _cairo_surface_composite_trapezoids (CAIRO_OPERATOR_IN, - &pattern.base, - gstate->clip.surface, - 0, 0, - 0, 0, - gstate->clip.rect.width, - gstate->clip.rect.height, - traps.traps, - traps.num_traps); - - _cairo_pattern_fini (&pattern.base); - - _cairo_traps_fini (&traps); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_show_surface (cairo_gstate_t *gstate, - cairo_surface_t *surface, - int width, - int height) -{ - - /* We are dealing with 6 coordinate spaces in this function. this makes - * it ugly. - * - * - "Image" space is the space of the surface we're reading pixels from. - * it is the surface argument to this function. The surface has a - * matrix attached to it which maps "user" space (see below) into - * image space. - * - * - "Device" space is the space of the surface we're ultimately writing - * pixels to. It is the current surface of the gstate argument to - * this function. - * - * - "User" space is an arbitrary space defined by the user, defined - * implicitly by the gstate's CTM. The CTM maps from user space to - * device space. The CTM inverse (which is also kept at all times) - * maps from device space to user space. - * - * - "Clip" space is the space of the surface being used to clip pixels - * during compositing. Space-wise, it is a bounding box (offset+size) - * within device space. This surface is usually smaller than the device - * surface (and possibly the image surface too) and logically occupies - * a bounding box around the "clip path", situated somewhere in device - * space. The clip path is already painted on the clip surface. - * - * - "Intermediate" space is the subset of the Clip space that the - * drawing will affect, and we allocate an intermediate surface - * of this size so that we can paint in it. - * - * - "Pattern" space is another arbitrary space defined in the pattern - * element of gstate. As pixels are read from image space, they are - * combined with pixels being read from pattern space and pixels - * already existing in device space. User coordinates are converted - * to pattern space, similarly, using a matrix attached to the pattern. - * (in fact, there is a 7th space in here, which is the space of the - * surface acting as a source for the pattern) - * - * To composite these spaces, we temporarily change the image surface - * so that it can be read and written in device coordinates; in a sense - * this makes it "spatially compatible" with the clip and device spaces. - * - * - * There is also some confusion about the interaction between a clip and - * a pattern; it is assumed that in this "show surface" operation a pattern - * is to be used as an auxiliary alpha mask. this might be wrong, but it's - * what we're doing now. - * - * so, to follow the operations below, remember that in the compositing - * model, each operation is always of the form ((src IN mask) OP dst). - * that's the basic operation. - * - * so the compositing we are trying to do here, in general, involves 2 - * steps, going via a temporary surface: - * - * - combining clip and pattern pixels together into a mask channel. - * this will be ((pattern IN clip) SRC temporary). it ignores the - * pixels already in the temporary, overwriting it with the - * pattern, clipped to the clip mask. - * - * - combining temporary and "image" pixels with "device" pixels, - * with a user-provided porter/duff operator. this will be - * ((image IN temporary) OP device). - * - * if there is no clip, the degenerate case is just the second step - * with pattern standing in for temporary. - * - */ - - cairo_status_t status = CAIRO_STATUS_SUCCESS; - cairo_matrix_t image_to_user, image_to_device; - double device_x, device_y; - double device_width, device_height; - cairo_surface_pattern_t pattern; - cairo_box_t pattern_extents; - cairo_rectangle_t extents; - - cairo_surface_get_matrix (surface, &image_to_user); - cairo_matrix_invert (&image_to_user); - cairo_matrix_multiply (&image_to_device, &image_to_user, &gstate->ctm); - - _cairo_gstate_current_point (gstate, &device_x, &device_y); - device_width = width; - device_height = height; - _cairo_matrix_transform_bounding_box (&image_to_device, - &device_x, &device_y, - &device_width, &device_height); - - _cairo_pattern_init_for_surface (&pattern, surface); - - /* inherit surface attributes while surface attribute functions still - exist */ - pattern.base.matrix = surface->matrix; - pattern.base.filter = surface->filter; - if (surface->repeat) - pattern.base.extend = CAIRO_EXTEND_REPEAT; - else - pattern.base.extend = CAIRO_EXTEND_NONE; - - _cairo_pattern_transform (&pattern.base, &gstate->ctm_inverse); - _cairo_pattern_set_alpha (&pattern.base, gstate->alpha); - - pattern_extents.p1.x = _cairo_fixed_from_double (device_x); - pattern_extents.p1.y = _cairo_fixed_from_double (device_y); - pattern_extents.p2.x = _cairo_fixed_from_double (device_x + device_width); - pattern_extents.p2.y = _cairo_fixed_from_double (device_y + device_height); - _cairo_box_round_to_rectangle (&pattern_extents, &extents); - - if (gstate->clip.surface) - { - _cairo_rectangle_intersect (&extents, &gstate->clip.rect); - - /* We only need to composite if the rectangle is not empty. */ - if (!_cairo_rectangle_empty (&extents)) { - cairo_surface_pattern_t clip_pattern; - - _cairo_pattern_init_for_surface (&clip_pattern, - gstate->clip.surface); - - status = _cairo_surface_composite (gstate->operator, - &pattern.base, - &clip_pattern.base, - gstate->surface, - extents.x, extents.y, - 0, 0, - extents.x, extents.y, - extents.width, extents.height); - - _cairo_pattern_fini (&clip_pattern.base); - } - } - else - { - /* XXX: The rendered size is sometimes 1 or 2 pixels short - * from what I expect. Need to fix this. - * KRH: I'm guessing this was due to rounding error when - * passing double coordinates for integer arguments. Using - * the extents rectangle should fix this, since it's properly - * rounded. Is this still the case? - */ - status = _cairo_surface_composite (gstate->operator, - &pattern.base, - NULL, - gstate->surface, - extents.x, extents.y, - 0, 0, - extents.x, extents.y, - extents.width, extents.height); - - } - - _cairo_pattern_fini (&pattern.base); - - return status; -} - -static void -_cairo_gstate_unset_font (cairo_gstate_t *gstate) -{ - if (gstate->font) { - cairo_font_destroy (gstate->font); - gstate->font = NULL; - } -} - -cairo_status_t -_cairo_gstate_select_font (cairo_gstate_t *gstate, - const char *family, - cairo_font_slant_t slant, - cairo_font_weight_t weight) -{ - char *new_family; - - new_family = strdup (family); - if (!new_family) - return CAIRO_STATUS_NO_MEMORY; - - _cairo_gstate_unset_font (gstate); - - gstate->font_family = new_family; - gstate->font_slant = slant; - gstate->font_weight = weight; - - cairo_matrix_set_identity (&gstate->font_matrix); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_scale_font (cairo_gstate_t *gstate, - double scale) -{ - _cairo_gstate_unset_font (gstate); - - return cairo_matrix_scale (&gstate->font_matrix, scale, scale); -} - -cairo_status_t -_cairo_gstate_transform_font (cairo_gstate_t *gstate, - cairo_matrix_t *matrix) -{ - cairo_matrix_t tmp; - double a, b, c, d, tx, ty; - - _cairo_gstate_unset_font (gstate); - - cairo_matrix_get_affine (matrix, &a, &b, &c, &d, &tx, &ty); - cairo_matrix_set_affine (&tmp, a, b, c, d, 0, 0); - return cairo_matrix_multiply (&gstate->font_matrix, &gstate->font_matrix, &tmp); -} - - -cairo_status_t -_cairo_gstate_current_font (cairo_gstate_t *gstate, - cairo_font_t **font) -{ - cairo_status_t status; - - status = _cairo_gstate_ensure_font (gstate); - if (status) - return status; - - *font = gstate->font; - - return CAIRO_STATUS_SUCCESS; -} - -void -_cairo_gstate_set_font_transform (cairo_gstate_t *gstate, - cairo_matrix_t *matrix) -{ - _cairo_gstate_unset_font (gstate); - - cairo_matrix_copy (&gstate->font_matrix, matrix); -} - -void -_cairo_gstate_current_font_transform (cairo_gstate_t *gstate, - cairo_matrix_t *matrix) -{ - cairo_matrix_copy (matrix, &gstate->font_matrix); -} - -/* - * Like everything else in this file, fonts involve Too Many Coordinate Spaces; - * it is easy to get confused about what's going on. - * - * The user's view - * --------------- - * - * Users ask for things in user space. When cairo starts, a user space unit - * is about 1/96 inch, which is similar to (but importantly different from) - * the normal "point" units most users think in terms of. When a user - * selects a font, its scale is set to "one user unit". The user can then - * independently scale the user coordinate system *or* the font matrix, in - * order to adjust the rendered size of the font. - * - * The only font type exposed to the user is cairo_font_t which is a - * a font specialized to a particular scale matrix, CTM, and target - * surface. The user is responsible for not using a cairo_font_t - * after changing the parameters; doing so will produce garbled metrics. - * - * - * The font's view - * --------------- - * - * Fonts are designed and stored (in say .ttf files) in "font space", which - * describes an "EM Square" (a design tile) and has some abstract number - * such as 1000, 1024, or 2048 units per "EM". This is basically an - * uninteresting space for us, but we need to remember that it exists. - * - * Font resources (from libraries or operating systems) render themselves - * to a particular device. Since they do not want to make most programmers - * worry about the font design space, the scaling API is simplified to - * involve just telling the font the required pixel size of the EM square - * (that is, in device space). - * - * - * Cairo's gstate view - * ------------------- - * - * In addition to the CTM and CTM inverse, we keep a matrix in the gstate - * called the "font matrix" which describes the user's most recent - * font-scaling or font-transforming request. This is kept in terms of an - * abstract scale factor, composed with the CTM and used to set the font's - * pixel size. So if the user asks to "scale the font by 12", the matrix - * is: - * - * [ 12.0, 0.0, 0.0, 12.0, 0.0, 0.0 ] - * - * It is an affine matrix, like all cairo matrices, but its tx and ty - * components are always set to zero; we don't permit "nudging" fonts - * around. - * - * In order to perform any action on a font, we must build an object - * called a cairo_font_scale_t; this contains the central 2x2 matrix - * resulting from "font matrix * CTM". - * - * We pass this to the font when making requests of it, which causes it to - * reply for a particular [user request, device] combination, under the CTM - * (to accomodate the "zoom in" == "bigger fonts" issue above). - * - * The other terms in our communication with the font are therefore in - * device space. When we ask it to perform text->glyph conversion, it will - * produce a glyph string in device space. Glyph vectors we pass to it for - * measuring or rendering should be in device space. The metrics which we - * get back from the font will be in device space. The contents of the - * global glyph image cache will be in device space. - * - * - * Cairo's public view - * ------------------- - * - * Since the values entering and leaving via public API calls are in user - * space, the gstate functions typically need to multiply argumens by the - * CTM (for user-input glyph vectors), and return values by the CTM inverse - * (for font responses such as metrics or glyph vectors). - * - */ - -void -_cairo_gstate_current_font_scale (cairo_gstate_t *gstate, - cairo_font_scale_t *sc) -{ - cairo_matrix_t tmp; - double dummy; - cairo_matrix_multiply (&tmp, &gstate->font_matrix, &gstate->ctm); - cairo_matrix_get_affine (&tmp, - &sc->matrix[0][0], - &sc->matrix[0][1], - &sc->matrix[1][0], - &sc->matrix[1][1], - &dummy, &dummy); -} - -static cairo_status_t -_cairo_gstate_ensure_font (cairo_gstate_t *gstate) -{ - cairo_font_scale_t sc; - cairo_status_t status; - const char *family; - - if (gstate->font) - return CAIRO_STATUS_SUCCESS; - - _cairo_gstate_current_font_scale (gstate, &sc); - - if (gstate->font_family) - family = gstate->font_family; - else - family = CAIRO_FONT_FAMILY_DEFAULT; - - status = _cairo_font_create (family, - gstate->font_slant, - gstate->font_weight, - &sc, - &gstate->font); - - if (status) - return status; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_current_font_extents (cairo_gstate_t *gstate, - cairo_font_extents_t *extents) -{ - cairo_status_t status = _cairo_gstate_ensure_font (gstate); - if (status) - return status; - - return cairo_font_extents (gstate->font, - &gstate->font_matrix, - extents); -} - -cairo_status_t -_cairo_gstate_text_to_glyphs (cairo_gstate_t *gstate, - const unsigned char *utf8, - cairo_glyph_t **glyphs, - int *nglyphs) -{ - cairo_status_t status; - - cairo_point_t point; - double origin_x, origin_y; - int i; - - status = _cairo_gstate_ensure_font (gstate); - if (status) - return status; - - status = _cairo_path_current_point (&gstate->path, &point); - if (status == CAIRO_STATUS_NO_CURRENT_POINT) { - origin_x = 0.0; - origin_y = 0.0; - } else { - origin_x = _cairo_fixed_to_double (point.x); - origin_y = _cairo_fixed_to_double (point.y); - cairo_matrix_transform_point (&gstate->ctm_inverse, - &origin_x, &origin_y); - } - - status = _cairo_font_text_to_glyphs (gstate->font, - utf8, glyphs, nglyphs); - - if (status || !glyphs || !nglyphs || !(*glyphs) || !(nglyphs)) - return status; - - /* The font responded in glyph space, starting from (0,0). Convert to - user space by applying the font transform, then add any current point - offset. */ - - for (i = 0; i < *nglyphs; ++i) { - cairo_matrix_transform_point (&gstate->font_matrix, - &((*glyphs)[i].x), - &((*glyphs)[i].y)); - (*glyphs)[i].x += origin_x; - (*glyphs)[i].y += origin_y; - } - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_set_font (cairo_gstate_t *gstate, - cairo_font_t *font) -{ - if (font != gstate->font) { - if (gstate->font) - cairo_font_destroy (gstate->font); - gstate->font = font; - if (gstate->font) - cairo_font_reference (gstate->font); - } - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_glyph_extents (cairo_gstate_t *gstate, - cairo_glyph_t *glyphs, - int num_glyphs, - cairo_text_extents_t *extents) -{ - cairo_status_t status; - - status = _cairo_gstate_ensure_font (gstate); - if (status) - return status; - - cairo_font_glyph_extents (gstate->font, - &gstate->font_matrix, - glyphs, num_glyphs, - extents); - - return CAIRO_STATUS_SUCCESS; -} - -cairo_status_t -_cairo_gstate_show_glyphs (cairo_gstate_t *gstate, - cairo_glyph_t *glyphs, - int num_glyphs) -{ - cairo_status_t status; - int i; - cairo_glyph_t *transformed_glyphs = NULL; - cairo_pattern_union_t pattern; - cairo_box_t bbox; - cairo_rectangle_t extents; - - status = _cairo_gstate_ensure_font (gstate); - if (status) - return status; - - transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t)); - if (transformed_glyphs == NULL) - return CAIRO_STATUS_NO_MEMORY; - - for (i = 0; i < num_glyphs; ++i) - { - transformed_glyphs[i] = glyphs[i]; - cairo_matrix_transform_point (&gstate->ctm, - &transformed_glyphs[i].x, - &transformed_glyphs[i].y); - } - - status = _cairo_font_glyph_bbox (gstate->font, - transformed_glyphs, num_glyphs, - &bbox); - _cairo_box_round_to_rectangle (&bbox, &extents); - - if (status) - goto CLEANUP_GLYPHS; - - if (gstate->clip.surface) - { - cairo_surface_t *intermediate; - cairo_surface_pattern_t intermediate_pattern; - cairo_color_t empty_color; - - _cairo_rectangle_intersect (&extents, &gstate->clip.rect); - - /* Shortcut if empty */ - if (_cairo_rectangle_empty (&extents)) { - status = CAIRO_STATUS_SUCCESS; - goto BAIL1; - } - - _cairo_color_init (&empty_color); - _cairo_color_set_alpha (&empty_color, .0); - intermediate = _cairo_surface_create_similar_solid (gstate->clip.surface, - CAIRO_FORMAT_A8, - extents.width, - extents.height, - &empty_color); - if (intermediate == NULL) { - status = CAIRO_STATUS_NO_MEMORY; - goto BAIL1; - } - - /* move the glyphs again, from dev space to intermediate space */ - for (i = 0; i < num_glyphs; ++i) - { - transformed_glyphs[i].x -= extents.x; - transformed_glyphs[i].y -= extents.y; - } - - _cairo_pattern_init_solid (&pattern.solid, 1.0, 1.0, 1.0); - - status = _cairo_font_show_glyphs (gstate->font, - CAIRO_OPERATOR_ADD, - &pattern.base, intermediate, - extents.x, extents.y, - 0, 0, - extents.width, extents.height, - transformed_glyphs, num_glyphs); - - _cairo_pattern_fini (&pattern.base); - - if (status) - goto BAIL2; - - _cairo_pattern_init_for_surface (&pattern.surface, - gstate->clip.surface); - - status = _cairo_surface_composite (CAIRO_OPERATOR_IN, - &pattern.base, - NULL, - intermediate, - extents.x - gstate->clip.rect.x, - extents.y - gstate->clip.rect.y, - 0, 0, - 0, 0, - extents.width, extents.height); - - _cairo_pattern_fini (&pattern.base); - - if (status) - goto BAIL2; - - _cairo_pattern_init_for_surface (&intermediate_pattern, intermediate); - _cairo_gstate_pattern_init_copy (gstate, &pattern, gstate->pattern); - - status = _cairo_surface_composite (gstate->operator, - &pattern.base, - &intermediate_pattern.base, - gstate->surface, - extents.x, extents.y, - 0, 0, - extents.x, extents.y, - extents.width, extents.height); - _cairo_pattern_fini (&pattern.base); - _cairo_pattern_fini (&intermediate_pattern.base); - - BAIL2: - cairo_surface_destroy (intermediate); - BAIL1: - ; - } - else - { - _cairo_gstate_pattern_init_copy (gstate, &pattern, gstate->pattern); - - status = _cairo_font_show_glyphs (gstate->font, - gstate->operator, &pattern.base, - gstate->surface, - extents.x, extents.y, - extents.x, extents.y, - extents.width, extents.height, - transformed_glyphs, num_glyphs); - - _cairo_pattern_fini (&pattern.base); - } - - CLEANUP_GLYPHS: - free (transformed_glyphs); - - return status; -} - -cairo_status_t -_cairo_gstate_glyph_path (cairo_gstate_t *gstate, - cairo_glyph_t *glyphs, - int num_glyphs) -{ - cairo_status_t status; - int i; - cairo_glyph_t *transformed_glyphs = NULL; - - transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t)); - if (transformed_glyphs == NULL) - return CAIRO_STATUS_NO_MEMORY; - - for (i = 0; i < num_glyphs; ++i) - { - transformed_glyphs[i] = glyphs[i]; - cairo_matrix_transform_point (&gstate->ctm, - &(transformed_glyphs[i].x), - &(transformed_glyphs[i].y)); - } - - status = _cairo_font_glyph_path (gstate->font, - transformed_glyphs, num_glyphs, - &gstate->path); - - free (transformed_glyphs); - return status; -} |