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Avoid unused alpha channels when rescaling

This commit is contained in:
Přemysl Eric Janouch 2021-12-28 01:19:57 +01:00
parent 720464327c
commit d4b51f07b5
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 5 additions and 4 deletions
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9
fiv-io.c
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@ -2785,6 +2785,7 @@ fiv_io_get_thumbnail_root(void)
static cairo_surface_t * static cairo_surface_t *
rescale_thumbnail(cairo_surface_t *thumbnail, double row_height) rescale_thumbnail(cairo_surface_t *thumbnail, double row_height)
{ {
cairo_format_t format = cairo_image_surface_get_format(thumbnail);
int width = cairo_image_surface_get_width(thumbnail); int width = cairo_image_surface_get_width(thumbnail);
int height = cairo_image_surface_get_height(thumbnail); int height = cairo_image_surface_get_height(thumbnail);
@ -2800,13 +2801,13 @@ rescale_thumbnail(cairo_surface_t *thumbnail, double row_height)
if (scale_x == 1 && scale_y == 1) if (scale_x == 1 && scale_y == 1)
return cairo_surface_reference(thumbnail); return cairo_surface_reference(thumbnail);
// TODO(p): Don't always include an alpha channel.
cairo_format_t cairo_format = CAIRO_FORMAT_ARGB32;
int projected_width = round(scale_x * width); int projected_width = round(scale_x * width);
int projected_height = round(scale_y * height); int projected_height = round(scale_y * height);
cairo_surface_t *scaled = cairo_image_surface_create( cairo_surface_t *scaled = cairo_image_surface_create(
cairo_format, projected_width, projected_height); (format == CAIRO_FORMAT_RGB24 || format == CAIRO_FORMAT_RGB30)
? CAIRO_FORMAT_RGB24
: CAIRO_FORMAT_ARGB32,
projected_width, projected_height);
cairo_t *cr = cairo_create(scaled); cairo_t *cr = cairo_create(scaled);
cairo_scale(cr, scale_x, scale_y); cairo_scale(cr, scale_x, scale_y);