From 51345623e888d7bc4131cd8f015c339f757ea68a Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Thu, 11 Mar 2021 20:06:09 +0100
Subject: [PATCH] Fixed bug 3727 - Blit from RGB555 to ARGB1555
---
src/video/SDL_blit_N.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/src/video/SDL_blit_N.c b/src/video/SDL_blit_N.c
index c75198076..bde23c623 100644
--- a/src/video/SDL_blit_N.c
+++ b/src/video/SDL_blit_N.c
@@ -2073,6 +2073,35 @@ Blit_RGB565_BGRA8888(SDL_BlitInfo * info)
#endif /* SDL_HAVE_BLIT_N_RGB565 */
+/* RGB555->ARGB1555, and BGR555->ABGR1555, SET_ALPHA */
+static void
+Blit_RGB555_ARGB1555(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *src = (Uint16 *) info->src;
+ int srcskip = info->src_skip;
+ Uint16 *dst = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+
+ Uint16 mask = ((Uint32)info->a >> dstfmt->Aloss) << dstfmt->Ashift;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ *dst = *src | mask;
+ ++dst;
+ ++src;
+ },
+ width);
+ /* *INDENT-ON* */
+ src = (Uint16 *) ((Uint8 *) src + srcskip);
+ dst = (Uint16 *) ((Uint8 *) dst + dstskip);
+ }
+}
+
static void
BlitNto1(SDL_BlitInfo * info)
{
@@ -3259,6 +3288,10 @@ static const struct blit_table normal_blit_2[] = {
{0x0000F800, 0x000007E0, 0x0000001F, 4, 0x0000FF00, 0x00FF0000, 0xFF000000,
0, Blit_RGB565_BGRA8888, NO_ALPHA | COPY_ALPHA | SET_ALPHA},
#endif
+ {0x00007C00, 0x000003E0, 0x0000001F, 2, 0x00007C00, 0x000003E0, 0x0000001F,
+ 0, Blit_RGB555_ARGB1555, SET_ALPHA},
+ {0x0000001F, 0x000003E0, 0x00007C00, 2, 0x0000001F, 0x000003E0, 0x00007C00,
+ 0, Blit_RGB555_ARGB1555, SET_ALPHA},
/* Default for 16-bit RGB source, used if no other blitter matches */
{0, 0, 0, 0, 0, 0, 0, 0, BlitNtoN, 0}