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lua-imlib2: Fix alpha mask so that its scaled

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Previously if the source image was a different to the displayed
image the alpha channel was incorrect, as it wasn't scaled leading
to a series of artifacts.
This commit is contained in:
Simon Lees 2024-02-22 16:12:33 +10:30 committed by Brenden Matthews
parent 01ca581259
commit 2e54b29450
1 changed files with 5 additions and 2 deletions
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7
lua/libcairo_imlib2_helper.h
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@ -33,7 +33,7 @@ void cairo_draw_image(const char *file, cairo_surface_t *cs, int x, int y,
double *return_scale_h) {
int w, h, stride;
double scaled_w, scaled_h;
Imlib_Image premul;
Imlib_Image alpha, premul;
cairo_surface_t *result;
cairo_t *cr;
Imlib_Image *image = imlib_load_image(file);
@ -64,6 +64,9 @@ void cairo_draw_image(const char *file, cairo_surface_t *cs, int x, int y,
return;
}
/* create scaled version of image to later extract the alpha channel */
alpha = imlib_create_cropped_scaled_image (0, 0, w, h, scaled_w, scaled_h);
/* create temporary image */
premul = imlib_create_image(scaled_w, scaled_h);
if (!premul) {
@ -81,7 +84,7 @@ void cairo_draw_image(const char *file, cairo_surface_t *cs, int x, int y,
imlib_blend_image_onto_image(image, 0, 0, 0, w, h, 0, 0, scaled_w, scaled_h);
/* and use the alpha channel of the source image */
imlib_image_copy_alpha_to_image(image, 0, 0);
imlib_image_copy_alpha_to_image(alpha, 0, 0);
stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, scaled_w);