From 414cb1a851025b99941c61b36e97c9c1342cd340 Mon Sep 17 00:00:00 2001 From: Michael Drake Date: Mon, 28 Mar 2022 16:08:00 +0100 Subject: GTK: Get the core to handle premultipled alpha bitmap format. --- frontends/gtk/bitmap.c | 170 ------------------------------------------------- 1 file changed, 170 deletions(-) (limited to 'frontends/gtk/bitmap.c') diff --git a/frontends/gtk/bitmap.c b/frontends/gtk/bitmap.c index eaa1ae919..ace507333 100644 --- a/frontends/gtk/bitmap.c +++ b/frontends/gtk/bitmap.c @@ -187,97 +187,13 @@ static bool bitmap_get_opaque(void *vbitmap) static unsigned char *bitmap_get_buffer(void *vbitmap) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - int pixel_loop; - int pixel_count; uint8_t *pixels; - uint32_t t, r, g, b; - cairo_format_t fmt; assert(gbitmap); cairo_surface_flush(gbitmap->surface); pixels = cairo_image_surface_get_data(gbitmap->surface); - if (!gbitmap->converted) - return pixels; - - fmt = cairo_image_surface_get_format(gbitmap->surface); - pixel_count = cairo_image_surface_get_width(gbitmap->surface) * - cairo_image_surface_get_height(gbitmap->surface); - - if (fmt == CAIRO_FORMAT_RGB24) { - /* Opaque image */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - /* Cairo surface is ARGB, written in native endian */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - /* We asked core for 0xAARRGGBB (native endian). */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } else { - /* Alpha image: de-multiply alpha */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - if (t != 0) { - r = (r << 8) / t; - g = (g << 8) / t; - b = (b << 8) / t; - - r = (r > 255) ? 255 : r; - g = (g > 255) ? 255 : g; - b = (b > 255) ? 255 : b; - } else { - r = g = b = 0; - } - - /* We asked core for 0xAARRGGBB (native endian). */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } - - gbitmap->converted = false; - return (unsigned char *) pixels; } @@ -325,96 +241,10 @@ static void bitmap_destroy(void *vbitmap) static void bitmap_modified(void *vbitmap) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - int pixel_loop; - int pixel_count; - uint8_t *pixels; - uint32_t t, r, g, b; - cairo_format_t fmt; assert(gbitmap); - fmt = cairo_image_surface_get_format(gbitmap->surface); - - pixel_count = cairo_image_surface_get_width(gbitmap->surface) * - cairo_image_surface_get_height(gbitmap->surface); - pixels = cairo_image_surface_get_data(gbitmap->surface); - - if (gbitmap->converted) { - cairo_surface_mark_dirty(gbitmap->surface); - return; - } - - if (fmt == CAIRO_FORMAT_RGB24) { - /* Opaque image */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - /* We asked core for 0xAARRGGBB (native endian). */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - /* Cairo surface is ARGB, written in native endian */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } else { - /* Alpha image: pre-multiply alpha */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - /* We asked core for 0xAARRGGBB (native endian). */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - if (t != 0) { - r = ((r * (t + 1)) >> 8) & 0xff; - g = ((g * (t + 1)) >> 8) & 0xff; - b = ((b * (t + 1)) >> 8) & 0xff; - } else { - r = g = b = 0; - } - - /* Cairo surface is ARGB, written in native endian */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } - cairo_surface_mark_dirty(gbitmap->surface); - - gbitmap->converted = true; } /* exported interface documented in gtk/bitmap.h */ -- cgit v1.2.3