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test: Support png images via paint_image

This commit is contained in:
Matthias Clasen 2022-12-17 02:46:37 -05:00 committed by Behdad Esfahbod
parent 6079173a52
commit 9876e30c6e
1 changed files with 59 additions and 0 deletions
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59
util/hb-test.c
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@ -2,6 +2,7 @@
#include <hb-ot.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <cairo.h>
#include <math.h>
@ -294,6 +295,63 @@ paint_color (hb_paint_funcs_t *funcs,
cairo_paint (data->cr);
}
typedef struct
{
hb_blob_t *blob;
unsigned int offset;
} read_blob_data_t;
cairo_status_t
read_blob (void *closure,
unsigned char *data,
unsigned int length)
{
read_blob_data_t *r = closure;
const char *d;
unsigned int size;
d = hb_blob_get_data (r->blob, &size);
if (r->offset + length > size)
return CAIRO_STATUS_READ_ERROR;
memcpy (data, d + r->offset, length);
r->offset += length;
return CAIRO_STATUS_SUCCESS;
}
static void
paint_image (hb_paint_funcs_t *funcs,
void *paint_data,
hb_codepoint_t glyph,
void *user_data)
{
paint_data_t *data = user_data;
read_blob_data_t r;
cairo_surface_t *surface;
cairo_pattern_t *pattern;
cairo_matrix_t m;
hb_glyph_extents_t extents;
hb_font_get_glyph_extents (data->font, glyph, &extents);
r.blob = hb_ot_color_glyph_reference_png (data->font, glyph);
r.offset = 0;
surface = cairo_image_surface_create_from_png_stream (read_blob, &r);
hb_blob_destroy (r.blob);
pattern = cairo_pattern_create_for_surface (surface);
cairo_matrix_init_scale (&m, 1, -1);
cairo_matrix_translate (&m, extents.x_bearing, - extents.y_bearing);
cairo_pattern_set_matrix (pattern, &m);
cairo_set_source (data->cr, pattern);
cairo_paint (data->cr);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
}
static void
reduce_anchors (float x0, float y0,
float x1, float y1,
@ -1008,6 +1066,7 @@ int main (int argc, char *argv[])
hb_paint_funcs_set_push_group_func (funcs, push_group, &data, NULL);
hb_paint_funcs_set_pop_group_func (funcs, pop_group, &data, NULL);
hb_paint_funcs_set_color_func (funcs, paint_color, &data, NULL);
hb_paint_funcs_set_image_func (funcs, paint_image, &data, NULL);
hb_paint_funcs_set_linear_gradient_func (funcs, paint_linear_gradient, &data, NULL);
hb_paint_funcs_set_radial_gradient_func (funcs, paint_radial_gradient, &data, NULL);
hb_paint_funcs_set_sweep_gradient_func (funcs, paint_sweep_gradient, &data, NULL);