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gdk: Add a rgb8 → rgba8 conversion macro

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This one can be used for both premultiplied and non-premultiplied alpha
formats, since alpha is always 255.  It is useful for opaque PNG upload
on both cairo and GL renderers.
This commit is contained in:
Emmanuel Gil Peyrot 2022-03-03 14:36:57 +00:00 committed by Matthias Clasen
parent c636ea036a
commit b8d01bf041
1 changed files with 46 additions and 0 deletions
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46
gdk/gdkmemoryformat.c
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@ -192,6 +192,28 @@ PREMULTIPLY_FUNC(r8g8b8a8_to_b8g8r8a8_premultiplied, 0, 1, 2, 3, 2, 1, 0, 3)
PREMULTIPLY_FUNC(r8g8b8a8_to_a8r8g8b8_premultiplied, 0, 1, 2, 3, 1, 2, 3, 0)
PREMULTIPLY_FUNC(r8g8b8a8_to_a8b8g8r8_premultiplied, 0, 1, 2, 3, 3, 2, 1, 0)
#define ADD_ALPHA_FUNC(name, R1, G1, B1, R2, G2, B2, A2) \
static void \
name (guchar *dest, \
const guchar *src, \
gsize n) \
{ \
for (; n > 0; n--) \
{ \
dest[R2] = src[R1]; \
dest[G2] = src[G1]; \
dest[B2] = src[B1]; \
dest[A2] = 255; \
dest += 4; \
src += 3; \
} \
}
ADD_ALPHA_FUNC(r8g8b8_to_r8g8b8a8, 0, 1, 2, 0, 1, 2, 3)
ADD_ALPHA_FUNC(r8g8b8_to_b8g8r8a8, 0, 1, 2, 2, 1, 0, 3)
ADD_ALPHA_FUNC(r8g8b8_to_a8r8g8b8, 0, 1, 2, 1, 2, 3, 0)
ADD_ALPHA_FUNC(r8g8b8_to_a8b8g8r8, 0, 1, 2, 3, 2, 1, 0)
struct _GdkMemoryFormatDescription
{
GdkMemoryAlpha alpha;
@ -518,6 +540,30 @@ gdk_memory_convert (guchar *dest_data,
func = r8g8b8a8_to_a8r8g8b8_premultiplied;
else if (src_format == GDK_MEMORY_B8G8R8A8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8a8_to_a8b8g8r8_premultiplied;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8_to_a8r8g8b8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8_to_a8b8g8r8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_R8G8B8A8)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_R8G8B8A8)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_B8G8R8A8)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_B8G8R8A8)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_A8R8G8B8)
func = r8g8b8_to_a8r8g8b8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_A8R8G8B8)
func = r8g8b8_to_a8b8g8r8;
if (func != NULL)
{