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/*
* Copyright 2009 Chris Wilson
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Chris Wilson not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Chris Wilson makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairo-test.h"
#include <assert.h>
static const char *png_filename = "romedalen.png";
#define WIDTH 800
#define HEIGHT 600
static cairo_status_t
_image_to_glyphs (cairo_surface_t *image,
int channel,
int level,
cairo_scaled_font_t *scaled_font,
double tx, double ty,
cairo_glyph_t *glyphs,
int *num_glyphs)
{
int width, height, stride;
const unsigned char *data;
cairo_format_t format;
int x, y, z, n;
width = cairo_image_surface_get_width (image);
height = cairo_image_surface_get_height (image);
stride = cairo_image_surface_get_stride (image);
format = cairo_image_surface_get_format (image);
data = cairo_image_surface_get_data (image);
n = 0;
for (y = 0; y < height; y++) {
const uint32_t *row = (uint32_t *) (data + y * stride);
for (x = 0; x < width; x++) {
z = (row[x] >> channel) & 0xff;
if (z == level) {
double xx, yy, zz;
char c = n % 26 + 'a';
int count = 1;
cairo_glyph_t *glyphs_p = &glyphs[n];
cairo_status_t status;
xx = 4 * (x - width/2.) + width/2.;
yy = 4 * (y - height/2.) + height/2.;
zz = z / 1000.;
xx = xx + zz*(width/2. - xx);
yy = yy + zz*(height/2. - yy);
cairo_scaled_font_text_to_glyphs (scaled_font,
tx + xx, ty + yy,
&c, 1,
&glyphs_p, &count,
NULL, NULL,
NULL);
status = cairo_scaled_font_status (scaled_font);
if (status)
return status;
assert (glyphs_p == &glyphs[n]);
assert (count == 1);
n++;
}
}
}
*num_glyphs = n;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_render_image (cairo_t *cr,
int width, int height,
cairo_surface_t *image)
{
int ww, hh;
cairo_glyph_t *glyphs;
cairo_pattern_t *mask;
cairo_scaled_font_t *scaled_font;
double tx, ty;
const struct {
int shift;
double red;
double green;
double blue;
} channel[3] = {
{ 0, 0.9, 0.3, 0.4 },
{ 8, 0.4, 0.9, 0.3 },
{ 16, 0.3, 0.4, 0.9 },
};
unsigned int n, i;
ww = cairo_image_surface_get_width (image);
hh = cairo_image_surface_get_height (image);
glyphs = cairo_glyph_allocate (ww * hh);
if (glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
tx = (width - ww) / 2.;
ty = (height - hh) / 2.;
cairo_set_font_size (cr, 5);
scaled_font = cairo_get_scaled_font (cr);
for (i = 0; i < ARRAY_LENGTH (channel); i++) {
cairo_push_group_with_content (cr, CAIRO_CONTENT_ALPHA);
for (n = 0; n < 256; n++) {
cairo_status_t status;
int num_glyphs;
status = _image_to_glyphs (image, channel[i].shift, n,
scaled_font,
tx, ty, glyphs, &num_glyphs);
if (status) {
cairo_glyph_free (glyphs);
return status;
}
cairo_set_source_rgba (cr,
0, 0, 0,
.15 + .85 * n / 255.);
cairo_show_glyphs (cr, glyphs, num_glyphs);
}
mask = cairo_pop_group (cr);
cairo_set_source_rgb (cr,
channel[i].red,
channel[i].green,
channel[i].blue);
cairo_mask (cr, mask);
cairo_pattern_destroy (mask);
}
cairo_glyph_free (glyphs);
return CAIRO_STATUS_SUCCESS;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
cairo_surface_t *image;
cairo_status_t status;
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
image = cairo_test_create_surface_from_png (ctx, png_filename);
status = cairo_surface_status (image);
if (status)
return cairo_test_status_from_status (ctx, status);
status = _render_image (cr, width, height, image);
cairo_surface_destroy (image);
return cairo_test_status_from_status (ctx, status);
}
CAIRO_TEST (mask_glyphs,
"Creates a mask using a distorted array of overlapping glyphs",
"mask, glyphs", /* keywords */
"slow", /* requirements */
WIDTH, HEIGHT,
NULL, draw)
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