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lib: Add a helper to paint a PNG using cairo

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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau
2013-08-23 16:46:45 +01:00
parent 30e0710ca3
commit bde7060e3c
2 changed files with 30 additions and 0 deletions
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lib/drmtest.c
+28
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@@ -1475,6 +1475,34 @@ void kmstest_paint_test_pattern(cairo_t *cr, int width, int height)
assert(!cairo_status(cr));
}
void kmstest_paint_image(cairo_t *cr, const char *filename,
int dst_x, int dst_y, int dst_width, int dst_height)
{
cairo_surface_t *image;
int img_width, img_height;
double scale_x, scale_y;
image = cairo_image_surface_create_from_png(filename);
assert(cairo_surface_status(image) == CAIRO_STATUS_SUCCESS);
img_width = cairo_image_surface_get_width(image);
img_height = cairo_image_surface_get_height(image);
scale_x = (double)dst_width / img_width;
scale_y = (double)dst_height / img_height;
cairo_save(cr);
cairo_translate(cr, dst_x, dst_y);
cairo_scale(cr, scale_x, scale_y);
cairo_set_source_surface(cr, image, 0, 0);
cairo_paint(cr);
cairo_surface_destroy(image);
cairo_restore(cr);
}
#define DF(did, cid, _bpp, _depth) \
{ DRM_FORMAT_##did, CAIRO_FORMAT_##cid, # did, _bpp, _depth }
static struct format_desc_struct {