/* cairo - a vector graphics library with display and print output * * Copyright © 2002 University of Southern California * Copyright © 2005 Red Hat, Inc. * * 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 */ #include "cairoint.h" #include "cairo-clip-private.h" #include "cairo-gstate-private.h" static cairo_status_t _cairo_gstate_init_copy (cairo_gstate_t *gstate, cairo_gstate_t *other); static cairo_status_t _cairo_gstate_ensure_font_face (cairo_gstate_t *gstate); static cairo_status_t _cairo_gstate_ensure_scaled_font (cairo_gstate_t *gstate); static void _cairo_gstate_unset_scaled_font (cairo_gstate_t *gstate); static void _cairo_gstate_transform_glyphs_to_backend (cairo_gstate_t *gstate, const cairo_glyph_t *glyphs, int num_glyphs, cairo_glyph_t *transformed_glyphs); cairo_status_t _cairo_gstate_init (cairo_gstate_t *gstate, cairo_surface_t *target) { gstate->next = NULL; gstate->op = CAIRO_GSTATE_OPERATOR_DEFAULT; gstate->tolerance = CAIRO_GSTATE_TOLERANCE_DEFAULT; gstate->antialias = CAIRO_ANTIALIAS_DEFAULT; _cairo_stroke_style_init (&gstate->stroke_style); gstate->fill_rule = CAIRO_GSTATE_FILL_RULE_DEFAULT; gstate->font_face = NULL; gstate->scaled_font = NULL; cairo_matrix_init_scale (&gstate->font_matrix, CAIRO_GSTATE_DEFAULT_FONT_SIZE, CAIRO_GSTATE_DEFAULT_FONT_SIZE); _cairo_font_options_init_default (&gstate->font_options); _cairo_clip_init (&gstate->clip, target); gstate->target = cairo_surface_reference (target); gstate->parent_target = NULL; gstate->original_target = cairo_surface_reference (target); _cairo_gstate_identity_matrix (gstate); gstate->source_ctm_inverse = gstate->ctm_inverse; gstate->source = _cairo_pattern_create_solid (CAIRO_COLOR_BLACK); if (gstate->source->status) return CAIRO_STATUS_NO_MEMORY; return CAIRO_STATUS_SUCCESS; } /** * _cairo_gstate_init_copy: * * Initialize @gstate by performing a deep copy of state fields from * @other. Note that gstate->next is not copied but is set to NULL by * this function. **/ static cairo_status_t _cairo_gstate_init_copy (cairo_gstate_t *gstate, cairo_gstate_t *other) { cairo_status_t status; gstate->op = other->op; gstate->tolerance = other->tolerance; gstate->antialias = other->antialias; status = _cairo_stroke_style_init_copy (&gstate->stroke_style, &other->stroke_style); if (status) return status; gstate->fill_rule = other->fill_rule; gstate->font_face = cairo_font_face_reference (other->font_face); gstate->scaled_font = cairo_scaled_font_reference (other->scaled_font); gstate->font_matrix = other->font_matrix; _cairo_font_options_init_copy (&gstate->font_options , &other->font_options); _cairo_clip_init_copy (&gstate->clip, &other->clip); gstate->target = cairo_surface_reference (other->target); /* parent_target is always set to NULL; it's only ever set by redirect_target */ gstate->parent_target = NULL; gstate->original_target = cairo_surface_reference (other->original_target); gstate->ctm = other->ctm; gstate->ctm_inverse = other->ctm_inverse; gstate->source_ctm_inverse = other->source_ctm_inverse; gstate->source = cairo_pattern_reference (other->source); gstate->next = NULL; return CAIRO_STATUS_SUCCESS; } void _cairo_gstate_fini (cairo_gstate_t *gstate) { _cairo_stroke_style_fini (&gstate->stroke_style); cairo_font_face_destroy (gstate->font_face); gstate->font_face = NULL; cairo_scaled_font_destroy (gstate->scaled_font); gstate->scaled_font = NULL; _cairo_clip_reset (&gstate->clip); cairo_surface_destroy (gstate->target); gstate->target = NULL; cairo_surface_destroy (gstate->parent_target); gstate->parent_target = NULL; cairo_surface_destroy (gstate->original_target); gstate->target = NULL; cairo_pattern_destroy (gstate->source); gstate->source = NULL; } static void _cairo_gstate_destroy (cairo_gstate_t *gstate) { if (gstate == NULL) return; _cairo_gstate_fini (gstate); free (gstate); } /** * _cairo_gstate_clone: * @other: a #cairo_gstate_t to be copied, not NULL. * * Create a new #cairo_gstate_t setting all graphics state parameters * to the same values as contained in @other. gstate->next will be set * to NULL and may be used by the caller to chain cairo_gstate_t * objects together. * * Return value: a new cairo_gstate_t or NULL if there is insufficient * memory. **/ static cairo_gstate_t* _cairo_gstate_clone (cairo_gstate_t *other) { cairo_status_t status; cairo_gstate_t *gstate; assert (other != NULL); gstate = malloc (sizeof (cairo_gstate_t)); if (gstate == NULL) return NULL; status = _cairo_gstate_init_copy (gstate, other); if (status) { free (gstate); return NULL; } return gstate; } /** * _cairo_gstate_save: * @gstate: input/output gstate pointer * * Makes a copy of the current state of @gstate and saves it * to @gstate->next, then put the address of the newly allcated * copy into @gstate. _cairo_gstate_restore() reverses this. **/ cairo_status_t _cairo_gstate_save (cairo_gstate_t **gstate) { cairo_gstate_t *top; top = _cairo_gstate_clone (*gstate); if (top == NULL) { return CAIRO_STATUS_NO_MEMORY; } top->next = *gstate; *gstate = top; return CAIRO_STATUS_SUCCESS; } /** * _cairo_gstate_restore: * @gstate: input/output gstate pointer * * Reverses the effects of one _cairo_gstate_save() call. **/ cairo_status_t _cairo_gstate_restore (cairo_gstate_t **gstate) { cairo_gstate_t *top; top = *gstate; if (top->next == NULL) { return CAIRO_STATUS_INVALID_RESTORE; } *gstate = top->next; _cairo_gstate_destroy (top); return CAIRO_STATUS_SUCCESS; } static cairo_status_t _cairo_gstate_recursive_apply_clip_path (cairo_gstate_t *gstate, cairo_clip_path_t *cpath) { cairo_status_t status; if (cpath == NULL) return CAIRO_STATUS_SUCCESS; status = _cairo_gstate_recursive_apply_clip_path (gstate, cpath->prev); if (status) return status; return _cairo_clip_clip (&gstate->clip, &cpath->path, cpath->fill_rule, cpath->tolerance, cpath->antialias, gstate->target); } /** * _cairo_gstate_redirect_target: * @gstate: a #cairo_gstate_t * @child: the new child target * * Redirect @gstate rendering to a "child" target. The original * "parent" target with which the gstate was created will not be * affected. See _cairo_gstate_get_target(). * * Unless the redirected target has the same device offsets as the * original #cairo_t target, the clip will be INVALID after this call, * and the caller should either recreate or reset the clip. **/ void _cairo_gstate_redirect_target (cairo_gstate_t *gstate, cairo_surface_t *child) { /* If this gstate is already redirected, this is an error; we need a * new gstate to be able to redirect */ assert (gstate->parent_target == NULL); /* Set up our new parent_target based on our current target; * gstate->parent_target will take the ref that is held by gstate->target */ cairo_surface_destroy (gstate->parent_target); gstate->parent_target = gstate->target; /* Now set up our new target; we overwrite gstate->target directly, * since its ref is now owned by gstate->parent_target */ gstate->target = cairo_surface_reference (child); _cairo_clip_reset (&gstate->clip); _cairo_clip_init_deep_copy (&gstate->clip, &gstate->next->clip, child); /* The clip is in surface backend coordinates for the previous target; * translate it into the child's backend coordinates. */ _cairo_clip_translate (&gstate->clip, _cairo_fixed_from_double (child->device_transform.x0 - gstate->parent_target->device_transform.x0), _cairo_fixed_from_double (child->device_transform.y0 - gstate->parent_target->device_transform.y0)); } /** * _cairo_gstate_is_redirected * @gstate: a #cairo_gstate_t * * Return value: TRUE if the gstate is redirected to a target * different than the original, FALSE otherwise. **/ cairo_bool_t _cairo_gstate_is_redirected (cairo_gstate_t *gstate) { return (gstate->target != gstate->original_target); } /** * _cairo_gstate_get_target: * @gstate: a #cairo_gstate_t * * Return the current drawing target; if drawing is not redirected, * this will be the same as _cairo_gstate_get_original_target(). * * Return value: the current target surface **/ cairo_surface_t * _cairo_gstate_get_target (cairo_gstate_t *gstate) { return gstate->target; } /** * _cairo_gstate_get_parent_target: * @gstate: a #cairo_gstate_t * * Return the parent surface of the current drawing target surface; * if this particular gstate isn't a redirect gstate, this will return NULL. **/ cairo_surface_t * _cairo_gstate_get_parent_target (cairo_gstate_t *gstate) { return gstate->parent_target; } /** * _cairo_gstate_get_original_target: * @gstate: a #cairo_gstate_t * * Return the original target with which @gstate was created. This * function always returns the original target independent of any * child target that may have been set with * _cairo_gstate_redirect_target. * * Return value: the original target surface **/ cairo_surface_t * _cairo_gstate_get_original_target (cairo_gstate_t *gstate) { return gstate->original_target; } /** * _cairo_gstate_get_clip: * @gstate: a #cairo_gstate_t * * Return value: a pointer to the gstate's cairo_clip_t structure. */ cairo_clip_t * _cairo_gstate_get_clip (cairo_gstate_t *gstate) { return &gstate->clip; } cairo_status_t _cairo_gstate_set_source (cairo_gstate_t *gstate, cairo_pattern_t *source) { if (source->status) return source->status; source = cairo_pattern_reference (source); cairo_pattern_destroy (gstate->source); gstate->source = source; gstate->source_ctm_inverse = gstate->ctm_inverse; return CAIRO_STATUS_SUCCESS; } cairo_pattern_t * _cairo_gstate_get_source (cairo_gstate_t *gstate) { if (gstate == NULL) return NULL; return gstate->source; } cairo_status_t _cairo_gstate_set_operator (cairo_gstate_t *gstate, cairo_operator_t op) { gstate->op = op; return CAIRO_STATUS_SUCCESS; } cairo_operator_t _cairo_gstate_get_operator (cairo_gstate_t *gstate) { return gstate->op; } cairo_status_t _cairo_gstate_set_tolerance (cairo_gstate_t *gstate, double tolerance) { gstate->tolerance = tolerance; return CAIRO_STATUS_SUCCESS; } double _cairo_gstate_get_tolerance (cairo_gstate_t *gstate) { return gstate->tolerance; } 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_get_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->stroke_style.line_width = width; return CAIRO_STATUS_SUCCESS; } double _cairo_gstate_get_line_width (cairo_gstate_t *gstate) { return gstate->stroke_style.line_width; } cairo_status_t _cairo_gstate_set_line_cap (cairo_gstate_t *gstate, cairo_line_cap_t line_cap) { gstate->stroke_style.line_cap = line_cap; return CAIRO_STATUS_SUCCESS; } cairo_line_cap_t _cairo_gstate_get_line_cap (cairo_gstate_t *gstate) { return gstate->stroke_style.line_cap; } cairo_status_t _cairo_gstate_set_line_join (cairo_gstate_t *gstate, cairo_line_join_t line_join) { gstate->stroke_style.line_join = line_join; return CAIRO_STATUS_SUCCESS; } cairo_line_join_t _cairo_gstate_get_line_join (cairo_gstate_t *gstate) { return gstate->stroke_style.line_join; } cairo_status_t _cairo_gstate_set_dash (cairo_gstate_t *gstate, const double *dash, int num_dashes, double offset) { unsigned int i; double dash_total; if (gstate->stroke_style.dash) free (gstate->stroke_style.dash); gstate->stroke_style.num_dashes = num_dashes; if (gstate->stroke_style.num_dashes == 0) { gstate->stroke_style.dash = NULL; gstate->stroke_style.dash_offset = 0.0; return CAIRO_STATUS_SUCCESS; } gstate->stroke_style.dash = malloc (gstate->stroke_style.num_dashes * sizeof (double)); if (gstate->stroke_style.dash == NULL) { gstate->stroke_style.num_dashes = 0; return CAIRO_STATUS_NO_MEMORY; } memcpy (gstate->stroke_style.dash, dash, gstate->stroke_style.num_dashes * sizeof (double)); dash_total = 0.0; for (i = 0; i < gstate->stroke_style.num_dashes; i++) { if (gstate->stroke_style.dash[i] < 0) return CAIRO_STATUS_INVALID_DASH; dash_total += gstate->stroke_style.dash[i]; } if (dash_total == 0.0) return CAIRO_STATUS_INVALID_DASH; /* A single dash value indicate symmetric repeating, so the total * is twice as long. */ if (gstate->stroke_style.num_dashes == 1) dash_total *= 2; /* The dashing code doesn't like a negative offset, so we compute * the equivalent positive offset. */ if (offset < 0) offset += ceil (-offset / dash_total + 0.5) * dash_total; gstate->stroke_style.dash_offset = offset; return CAIRO_STATUS_SUCCESS; } void _cairo_gstate_get_dash (cairo_gstate_t *gstate, double *dashes, int *num_dashes, double *offset) { if (dashes) memcpy (dashes, gstate->stroke_style.dash, sizeof (double) * gstate->stroke_style.num_dashes); if (num_dashes) *num_dashes = gstate->stroke_style.num_dashes; if (offset) *offset = gstate->stroke_style.dash_offset; } cairo_status_t _cairo_gstate_set_miter_limit (cairo_gstate_t *gstate, double limit) { gstate->stroke_style.miter_limit = limit; return CAIRO_STATUS_SUCCESS; } double _cairo_gstate_get_miter_limit (cairo_gstate_t *gstate) { return gstate->stroke_style.miter_limit; } void _cairo_gstate_get_matrix (cairo_gstate_t *gstate, cairo_matrix_t *matrix) { *matrix = gstate->ctm; } cairo_status_t _cairo_gstate_translate (cairo_gstate_t *gstate, double tx, double ty) { cairo_matrix_t tmp; _cairo_gstate_unset_scaled_font (gstate); cairo_matrix_init_translate (&tmp, tx, ty); cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); cairo_matrix_init_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_scaled_font (gstate); cairo_matrix_init_scale (&tmp, sx, sy); cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); cairo_matrix_init_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_scaled_font (gstate); cairo_matrix_init_rotate (&tmp, angle); cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); cairo_matrix_init_rotate (&tmp, -angle); cairo_matrix_multiply (&gstate->ctm_inverse, &gstate->ctm_inverse, &tmp); return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_transform (cairo_gstate_t *gstate, const cairo_matrix_t *matrix) { cairo_matrix_t tmp; cairo_status_t status; _cairo_gstate_unset_scaled_font (gstate); tmp = *matrix; cairo_matrix_multiply (&gstate->ctm, &tmp, &gstate->ctm); status = cairo_matrix_invert (&tmp); if (status) return status; 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, const cairo_matrix_t *matrix) { cairo_status_t status; _cairo_gstate_unset_scaled_font (gstate); gstate->ctm = *matrix; gstate->ctm_inverse = *matrix; status = cairo_matrix_invert (&gstate->ctm_inverse); if (status) return status; return CAIRO_STATUS_SUCCESS; } void _cairo_gstate_identity_matrix (cairo_gstate_t *gstate) { _cairo_gstate_unset_scaled_font (gstate); cairo_matrix_init_identity (&gstate->ctm); cairo_matrix_init_identity (&gstate->ctm_inverse); } void _cairo_gstate_user_to_device (cairo_gstate_t *gstate, double *x, double *y) { cairo_matrix_transform_point (&gstate->ctm, x, y); } void _cairo_gstate_user_to_device_distance (cairo_gstate_t *gstate, double *dx, double *dy) { cairo_matrix_transform_distance (&gstate->ctm, dx, dy); } void _cairo_gstate_device_to_user (cairo_gstate_t *gstate, double *x, double *y) { cairo_matrix_transform_point (&gstate->ctm_inverse, x, y); } void _cairo_gstate_device_to_user_distance (cairo_gstate_t *gstate, double *dx, double *dy) { cairo_matrix_transform_distance (&gstate->ctm_inverse, dx, dy); } void _cairo_gstate_user_to_backend (cairo_gstate_t *gstate, double *x, double *y) { cairo_matrix_transform_point (&gstate->ctm, x, y); cairo_matrix_transform_point (&gstate->target->device_transform, x, y); } void _cairo_gstate_backend_to_user (cairo_gstate_t *gstate, double *x, double *y) { cairo_matrix_transform_point (&gstate->target->device_transform_inverse, x, y); cairo_matrix_transform_point (&gstate->ctm_inverse, x, y); } void _cairo_gstate_backend_to_user_rectangle (cairo_gstate_t *gstate, double *x1, double *y1, double *x2, double *y2, cairo_bool_t *is_tight) { cairo_matrix_t matrix_inverse; cairo_matrix_multiply (&matrix_inverse, &gstate->ctm_inverse, &gstate->target->device_transform_inverse); _cairo_matrix_transform_bounding_box (&matrix_inverse, x1, y1, x2, y2, is_tight); } /* XXX: NYI cairo_status_t _cairo_gstate_stroke_to_path (cairo_gstate_t *gstate) { cairo_status_t status; _cairo_pen_init (&gstate); return CAIRO_STATUS_SUCCESS; } */ static void _cairo_gstate_copy_transformed_pattern (cairo_gstate_t *gstate, cairo_pattern_t *pattern, cairo_pattern_t *original, cairo_matrix_t *ctm_inverse) { cairo_surface_pattern_t *surface_pattern; cairo_surface_t *surface; _cairo_pattern_init_copy (pattern, original); _cairo_pattern_transform (pattern, ctm_inverse); if (cairo_pattern_get_type (original) == CAIRO_PATTERN_TYPE_SURFACE) { surface_pattern = (cairo_surface_pattern_t *) original; surface = surface_pattern->surface; if (_cairo_surface_has_device_transform (surface)) _cairo_pattern_transform (pattern, &surface->device_transform); } } static void _cairo_gstate_copy_transformed_source (cairo_gstate_t *gstate, cairo_pattern_t *pattern) { _cairo_gstate_copy_transformed_pattern (gstate, pattern, gstate->source, &gstate->source_ctm_inverse); } static void _cairo_gstate_copy_transformed_mask (cairo_gstate_t *gstate, cairo_pattern_t *pattern, cairo_pattern_t *mask) { _cairo_gstate_copy_transformed_pattern (gstate, pattern, mask, &gstate->ctm_inverse); } cairo_status_t _cairo_gstate_paint (cairo_gstate_t *gstate) { cairo_status_t status; cairo_pattern_union_t pattern; if (gstate->source->status) return gstate->source->status; status = _cairo_surface_set_clip (gstate->target, &gstate->clip); if (status) return status; _cairo_gstate_copy_transformed_source (gstate, &pattern.base); status = _cairo_surface_paint (gstate->target, gstate->op, &pattern.base); _cairo_pattern_fini (&pattern.base); return status; } /** * _cairo_operator_bounded_by_mask: * @op: a #cairo_operator_t * * A bounded operator is one where mask pixel * of zero results in no effect on the destination image. * * Unbounded operators often require special handling; if you, for * example, draw trapezoids with an unbounded operator, the effect * extends past the bounding box of the trapezoids. * * Return value: %TRUE if the operator is bounded by the mask operand **/ cairo_bool_t _cairo_operator_bounded_by_mask (cairo_operator_t op) { switch (op) { case CAIRO_OPERATOR_CLEAR: case CAIRO_OPERATOR_SOURCE: case CAIRO_OPERATOR_OVER: case CAIRO_OPERATOR_ATOP: case CAIRO_OPERATOR_DEST: case CAIRO_OPERATOR_DEST_OVER: case CAIRO_OPERATOR_DEST_OUT: case CAIRO_OPERATOR_XOR: case CAIRO_OPERATOR_ADD: case CAIRO_OPERATOR_SATURATE: return TRUE; case CAIRO_OPERATOR_OUT: case CAIRO_OPERATOR_IN: case CAIRO_OPERATOR_DEST_IN: case CAIRO_OPERATOR_DEST_ATOP: return FALSE; } ASSERT_NOT_REACHED; return FALSE; } /** * _cairo_operator_bounded_by_source: * @op: a #cairo_operator_t * * A bounded operator is one where source pixels of zero * (in all four components, r, g, b and a) effect no change * in the resulting destination image. * * Unbounded operators often require special handling; if you, for * example, copy a surface with the SOURCE operator, the effect * extends past the bounding box of the source surface. * * Return value: %TRUE if the operator is bounded by the source operand **/ cairo_bool_t _cairo_operator_bounded_by_source (cairo_operator_t op) { switch (op) { case CAIRO_OPERATOR_OVER: case CAIRO_OPERATOR_ATOP: case CAIRO_OPERATOR_DEST: case CAIRO_OPERATOR_DEST_OVER: case CAIRO_OPERATOR_DEST_OUT: case CAIRO_OPERATOR_XOR: case CAIRO_OPERATOR_ADD: case CAIRO_OPERATOR_SATURATE: return TRUE; case CAIRO_OPERATOR_CLEAR: case CAIRO_OPERATOR_SOURCE: case CAIRO_OPERATOR_OUT: case CAIRO_OPERATOR_IN: case CAIRO_OPERATOR_DEST_IN: case CAIRO_OPERATOR_DEST_ATOP: return FALSE; } ASSERT_NOT_REACHED; return FALSE; } cairo_status_t _cairo_gstate_mask (cairo_gstate_t *gstate, cairo_pattern_t *mask) { cairo_status_t status; cairo_pattern_union_t source_pattern, mask_pattern; if (mask->status) return mask->status; if (gstate->source->status) return gstate->source->status; status = _cairo_surface_set_clip (gstate->target, &gstate->clip); if (status) return status; _cairo_gstate_copy_transformed_source (gstate, &source_pattern.base); _cairo_gstate_copy_transformed_mask (gstate, &mask_pattern.base, mask); status = _cairo_surface_mask (gstate->target, gstate->op, &source_pattern.base, &mask_pattern.base); _cairo_pattern_fini (&source_pattern.base); _cairo_pattern_fini (&mask_pattern.base); return status; } cairo_status_t _cairo_gstate_stroke (cairo_gstate_t *gstate, cairo_path_fixed_t *path) { cairo_status_t status; cairo_pattern_union_t source_pattern; if (gstate->source->status) return gstate->source->status; if (gstate->stroke_style.line_width <= 0.0) return CAIRO_STATUS_SUCCESS; status = _cairo_surface_set_clip (gstate->target, &gstate->clip); if (status) return status; _cairo_gstate_copy_transformed_source (gstate, &source_pattern.base); status = _cairo_surface_stroke (gstate->target, gstate->op, &source_pattern.base, path, &gstate->stroke_style, &gstate->ctm, &gstate->ctm_inverse, gstate->tolerance, gstate->antialias); _cairo_pattern_fini (&source_pattern.base); return status; } cairo_status_t _cairo_gstate_in_stroke (cairo_gstate_t *gstate, cairo_path_fixed_t *path, double x, double y, cairo_bool_t *inside_ret) { cairo_status_t status = CAIRO_STATUS_SUCCESS; cairo_traps_t traps; if (gstate->stroke_style.line_width <= 0.0) { *inside_ret = FALSE; return CAIRO_STATUS_SUCCESS; } _cairo_gstate_user_to_backend (gstate, &x, &y); _cairo_traps_init (&traps); status = _cairo_path_fixed_stroke_to_traps (path, &gstate->stroke_style, &gstate->ctm, &gstate->ctm_inverse, gstate->tolerance, &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_fill (cairo_gstate_t *gstate, cairo_path_fixed_t *path) { cairo_status_t status; cairo_pattern_union_t pattern; if (gstate->source->status) return gstate->source->status; status = _cairo_surface_set_clip (gstate->target, &gstate->clip); if (status) return status; _cairo_gstate_copy_transformed_source (gstate, &pattern.base); status = _cairo_surface_fill (gstate->target, gstate->op, &pattern.base, path, gstate->fill_rule, gstate->tolerance, gstate->antialias); _cairo_pattern_fini (&pattern.base); return status; } cairo_status_t _cairo_gstate_in_fill (cairo_gstate_t *gstate, cairo_path_fixed_t *path, double x, double y, cairo_bool_t *inside_ret) { cairo_status_t status = CAIRO_STATUS_SUCCESS; cairo_traps_t traps; _cairo_gstate_user_to_backend (gstate, &x, &y); _cairo_traps_init (&traps); status = _cairo_path_fixed_fill_to_traps (path, gstate->fill_rule, gstate->tolerance, &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) { cairo_int_status_t status; status = _cairo_surface_copy_page (gstate->target); /* It's fine if some surfaces just don't support this. */ if (status == CAIRO_INT_STATUS_UNSUPPORTED) return CAIRO_STATUS_SUCCESS; return status; } cairo_status_t _cairo_gstate_show_page (cairo_gstate_t *gstate) { cairo_int_status_t status; status = _cairo_surface_show_page (gstate->target); /* It's fine if some surfaces just don't support this. */ if (status == CAIRO_INT_STATUS_UNSUPPORTED) return CAIRO_STATUS_SUCCESS; return status; } static void _cairo_gstate_traps_extents_to_user_rectangle (cairo_gstate_t *gstate, cairo_traps_t *traps, double *x1, double *y1, double *x2, double *y2) { cairo_box_t extents; _cairo_traps_extents (traps, &extents); if (extents.p1.x >= extents.p2.x || extents.p1.y >= extents.p2.y) { /* no traps, so we actually won't draw anything */ if (x1) *x1 = 0.0; if (y1) *y1 = 0.0; if (x2) *x2 = 0.0; if (y2) *y2 = 0.0; } else { if (x1) *x1 = _cairo_fixed_to_double (extents.p1.x); if (y1) *y1 = _cairo_fixed_to_double (extents.p1.y); if (x2) *x2 = _cairo_fixed_to_double (extents.p2.x); if (y2) *y2 = _cairo_fixed_to_double (extents.p2.y); _cairo_gstate_backend_to_user_rectangle (gstate, x1, y1, x2, y2, NULL); } } cairo_status_t _cairo_gstate_stroke_extents (cairo_gstate_t *gstate, cairo_path_fixed_t *path, double *x1, double *y1, double *x2, double *y2) { cairo_status_t status; cairo_traps_t traps; if (gstate->stroke_style.line_width <= 0.0) { if (x1) *x1 = 0.0; if (y1) *y1 = 0.0; if (x2) *x2 = 0.0; if (y2) *y2 = 0.0; return CAIRO_STATUS_SUCCESS; } _cairo_traps_init (&traps); status = _cairo_path_fixed_stroke_to_traps (path, &gstate->stroke_style, &gstate->ctm, &gstate->ctm_inverse, gstate->tolerance, &traps); if (status == CAIRO_STATUS_SUCCESS) { _cairo_gstate_traps_extents_to_user_rectangle(gstate, &traps, x1, y1, x2, y2); } _cairo_traps_fini (&traps); return status; } cairo_status_t _cairo_gstate_fill_extents (cairo_gstate_t *gstate, cairo_path_fixed_t *path, double *x1, double *y1, double *x2, double *y2) { cairo_status_t status; cairo_traps_t traps; _cairo_traps_init (&traps); status = _cairo_path_fixed_fill_to_traps (path, gstate->fill_rule, gstate->tolerance, &traps); if (status == CAIRO_STATUS_SUCCESS) { _cairo_gstate_traps_extents_to_user_rectangle(gstate, &traps, x1, y1, x2, y2); } _cairo_traps_fini (&traps); return status; } cairo_status_t _cairo_gstate_reset_clip (cairo_gstate_t *gstate) { return _cairo_clip_reset (&gstate->clip); } cairo_status_t _cairo_gstate_clip (cairo_gstate_t *gstate, cairo_path_fixed_t *path) { return _cairo_clip_clip (&gstate->clip, path, gstate->fill_rule, gstate->tolerance, gstate->antialias, gstate->target); } cairo_status_t _cairo_gstate_clip_extents (cairo_gstate_t *gstate, double *x1, double *y1, double *x2, double *y2) { cairo_rectangle_int16_t extents; cairo_status_t status; status = _cairo_surface_get_extents (gstate->target, &extents); if (status) return status; status = _cairo_clip_intersect_to_rectangle (&gstate->clip, &extents); if (status) return status; if (x1) *x1 = extents.x; if (y1) *y1 = extents.y; if (x2) *x2 = extents.x + extents.width; if (y2) *y2 = extents.y + extents.height; _cairo_gstate_backend_to_user_rectangle (gstate, x1, y1, x2, y2, NULL); return CAIRO_STATUS_SUCCESS; } cairo_rectangle_list_t* _cairo_gstate_copy_clip_rectangle_list (cairo_gstate_t *gstate) { return _cairo_clip_copy_rectangle_list (&gstate->clip, gstate); } static void _cairo_gstate_unset_scaled_font (cairo_gstate_t *gstate) { if (gstate->scaled_font) { cairo_scaled_font_destroy (gstate->scaled_font); gstate->scaled_font = NULL; } } cairo_status_t _cairo_gstate_select_font_face (cairo_gstate_t *gstate, const char *family, cairo_font_slant_t slant, cairo_font_weight_t weight) { cairo_font_face_t *font_face; cairo_status_t status; font_face = _cairo_toy_font_face_create (family, slant, weight); if (font_face->status) return font_face->status; status = _cairo_gstate_set_font_face (gstate, font_face); if (status) return status; cairo_font_face_destroy (font_face); return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_set_font_size (cairo_gstate_t *gstate, double size) { _cairo_gstate_unset_scaled_font (gstate); cairo_matrix_init_scale (&gstate->font_matrix, size, size); return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_set_font_matrix (cairo_gstate_t *gstate, const cairo_matrix_t *matrix) { _cairo_gstate_unset_scaled_font (gstate); gstate->font_matrix = *matrix; return CAIRO_STATUS_SUCCESS; } void _cairo_gstate_get_font_matrix (cairo_gstate_t *gstate, cairo_matrix_t *matrix) { *matrix = gstate->font_matrix; } cairo_status_t _cairo_gstate_set_font_options (cairo_gstate_t *gstate, const cairo_font_options_t *options) { _cairo_gstate_unset_scaled_font (gstate); gstate->font_options = *options; return CAIRO_STATUS_SUCCESS; } void _cairo_gstate_get_font_options (cairo_gstate_t *gstate, cairo_font_options_t *options) { *options = gstate->font_options; } cairo_status_t _cairo_gstate_get_font_face (cairo_gstate_t *gstate, cairo_font_face_t **font_face) { cairo_status_t status; status = _cairo_gstate_ensure_font_face (gstate); if (status) return status; *font_face = gstate->font_face; return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_get_scaled_font (cairo_gstate_t *gstate, cairo_scaled_font_t **scaled_font) { cairo_status_t status; status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; *scaled_font = gstate->scaled_font; return CAIRO_STATUS_SUCCESS; } /* * 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. * * Metrics are returned in user space, whether they are obtained from * the currently selected font in a #cairo_t or from a #cairo_scaled_font_t * which is a font specialized to a particular scale matrix, CTM, and target * surface. * * 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 accommodate 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 arguments by the * CTM (for user-input glyph vectors), and return values by the CTM inverse * (for font responses such as metrics or glyph vectors). * */ static cairo_status_t _cairo_gstate_ensure_font_face (cairo_gstate_t *gstate) { if (!gstate->font_face) { cairo_font_face_t *font_face; font_face = _cairo_toy_font_face_create (CAIRO_FONT_FAMILY_DEFAULT, CAIRO_FONT_SLANT_DEFAULT, CAIRO_FONT_WEIGHT_DEFAULT); if (font_face->status) return font_face->status; else gstate->font_face = font_face; } return CAIRO_STATUS_SUCCESS; } static cairo_status_t _cairo_gstate_ensure_scaled_font (cairo_gstate_t *gstate) { cairo_status_t status; cairo_font_options_t options; if (gstate->scaled_font) return CAIRO_STATUS_SUCCESS; status = _cairo_gstate_ensure_font_face (gstate); if (status) return status; cairo_surface_get_font_options (gstate->target, &options); cairo_font_options_merge (&options, &gstate->font_options); gstate->scaled_font = cairo_scaled_font_create (gstate->font_face, &gstate->font_matrix, &gstate->ctm, &options); if (!gstate->scaled_font) return CAIRO_STATUS_NO_MEMORY; return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_get_font_extents (cairo_gstate_t *gstate, cairo_font_extents_t *extents) { cairo_status_t status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; cairo_scaled_font_extents (gstate->scaled_font, extents); return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_text_to_glyphs (cairo_gstate_t *gstate, const char *utf8, double x, double y, cairo_glyph_t **glyphs, int *num_glyphs) { cairo_status_t status; status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; status = _cairo_scaled_font_text_to_glyphs (gstate->scaled_font, x, y, utf8, glyphs, num_glyphs); if (status || !glyphs || !num_glyphs || !(*glyphs) || !(num_glyphs)) return status; return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_set_font_face (cairo_gstate_t *gstate, cairo_font_face_t *font_face) { if (font_face && font_face->status) return font_face->status; if (font_face != gstate->font_face) { cairo_font_face_destroy (gstate->font_face); gstate->font_face = cairo_font_face_reference (font_face); } _cairo_gstate_unset_scaled_font (gstate); return CAIRO_STATUS_SUCCESS; } cairo_status_t _cairo_gstate_glyph_extents (cairo_gstate_t *gstate, const cairo_glyph_t *glyphs, int num_glyphs, cairo_text_extents_t *extents) { cairo_status_t status; status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; cairo_scaled_font_glyph_extents (gstate->scaled_font, glyphs, num_glyphs, extents); return CAIRO_STATUS_SUCCESS; } #define STACK_GLYPHS_LEN ((int) (CAIRO_STACK_BUFFER_SIZE / sizeof (cairo_glyph_t))) cairo_status_t _cairo_gstate_show_glyphs (cairo_gstate_t *gstate, const cairo_glyph_t *glyphs, int num_glyphs) { cairo_status_t status; cairo_pattern_union_t source_pattern; cairo_glyph_t *transformed_glyphs; cairo_glyph_t stack_transformed_glyphs[STACK_GLYPHS_LEN]; if (gstate->source->status) return gstate->source->status; status = _cairo_surface_set_clip (gstate->target, &gstate->clip); if (status) return status; status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; if (num_glyphs <= STACK_GLYPHS_LEN) { transformed_glyphs = stack_transformed_glyphs; } else { transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t)); if (transformed_glyphs == NULL) return CAIRO_STATUS_NO_MEMORY; } _cairo_gstate_transform_glyphs_to_backend (gstate, glyphs, num_glyphs, transformed_glyphs); _cairo_gstate_copy_transformed_source (gstate, &source_pattern.base); status = _cairo_surface_show_glyphs (gstate->target, gstate->op, &source_pattern.base, transformed_glyphs, num_glyphs, gstate->scaled_font); _cairo_pattern_fini (&source_pattern.base); if (transformed_glyphs != stack_transformed_glyphs) free (transformed_glyphs); return status; } cairo_status_t _cairo_gstate_glyph_path (cairo_gstate_t *gstate, const cairo_glyph_t *glyphs, int num_glyphs, cairo_path_fixed_t *path) { cairo_status_t status; cairo_glyph_t *transformed_glyphs; cairo_glyph_t stack_transformed_glyphs[STACK_GLYPHS_LEN]; status = _cairo_gstate_ensure_scaled_font (gstate); if (status) return status; if (num_glyphs < STACK_GLYPHS_LEN) transformed_glyphs = stack_transformed_glyphs; else transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t)); if (transformed_glyphs == NULL) return CAIRO_STATUS_NO_MEMORY; _cairo_gstate_transform_glyphs_to_backend (gstate, glyphs, num_glyphs, transformed_glyphs); status = _cairo_scaled_font_glyph_path (gstate->scaled_font, transformed_glyphs, num_glyphs, path); if (transformed_glyphs != stack_transformed_glyphs) free (transformed_glyphs); return status; } #undef STACK_GLYPHS_LEN cairo_status_t _cairo_gstate_set_antialias (cairo_gstate_t *gstate, cairo_antialias_t antialias) { gstate->antialias = antialias; return CAIRO_STATUS_SUCCESS; } cairo_antialias_t _cairo_gstate_get_antialias (cairo_gstate_t *gstate) { return gstate->antialias; } /** * _cairo_gstate_transform_glyphs_to_backend: * @gstate: a #cairo_gstate_t * @glyphs: the array of #cairo_glyph_t objects to be transformed * @num_glyphs: the number of elements in @glyphs * @transformed_glyphs: a pre-allocated array of at least @num_glyphs * #cairo_glyph_t objects * * Transform an array of glyphs to backend space by first adding the offset * of the font matrix, then transforming from user space to backend space. * The result of the transformation is placed in @transformed_glyphs. **/ static void _cairo_gstate_transform_glyphs_to_backend (cairo_gstate_t *gstate, const cairo_glyph_t *glyphs, int num_glyphs, cairo_glyph_t *transformed_glyphs) { int i; cairo_matrix_t *ctm = &gstate->ctm; cairo_matrix_t *device_transform = &gstate->target->device_transform; if (_cairo_matrix_is_identity (ctm) && _cairo_matrix_is_identity (device_transform) && gstate->font_matrix.x0 == 0 && gstate->font_matrix.y0 == 0) { memcpy (transformed_glyphs, glyphs, num_glyphs * sizeof (cairo_glyph_t)); } else if (_cairo_matrix_is_translation (ctm) && _cairo_matrix_is_translation (device_transform)) { double tx = gstate->font_matrix.x0 + ctm->x0 + device_transform->x0; double ty = gstate->font_matrix.y0 + ctm->y0 + device_transform->y0; for (i = 0; i < num_glyphs; i++) { transformed_glyphs[i].index = glyphs[i].index; transformed_glyphs[i].x = glyphs[i].x + tx; transformed_glyphs[i].y = glyphs[i].y + ty; } } else { cairo_matrix_t aggregate_transform; cairo_matrix_init_translate (&aggregate_transform, gstate->font_matrix.x0, gstate->font_matrix.y0); cairo_matrix_multiply (&aggregate_transform, &aggregate_transform, ctm); cairo_matrix_multiply (&aggregate_transform, &aggregate_transform, device_transform); for (i = 0; i < num_glyphs; i++) { transformed_glyphs[i] = glyphs[i]; cairo_matrix_transform_point (&aggregate_transform, &transformed_glyphs[i].x, &transformed_glyphs[i].y); } } }