Mercurial > sdl-ios-xcode

annotate src/video/SDL_blit_slow.c @ 3495:1b22878e04d0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Adam Strzelecki to SDL D3D renderer shall try mapping YV12 and I420 (IYUV) to D3D texture formats via FOURCC. This will enable HW acceleration for those formats when driver is capable (most of them are). Note that SDL's IYUV maps I420 FOURCC on Woe.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 27 Nov 2009 03:11:26 +0000
parents 99210400e8b9
children c5fe76962106
rev   line source
2256
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
1 /*
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
2 SDL - Simple DirectMedia Layer
2859
99210400e8b9 Updated copyright date
Sam Lantinga <slouken@libsdl.org>
parents: 2824
diff changeset
3 Copyright (C) 1997-2009 Sam Lantinga
2256
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
4
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
5 This library is free software; you can redistribute it and/or
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
6 modify it under the terms of the GNU Lesser General Public
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
7 License as published by the Free Software Foundation; either
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
8 version 2.1 of the License, or (at your option) any later version.
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
9
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
10 This library is distributed in the hope that it will be useful,
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
13 Lesser General Public License for more details.
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
14
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
15 You should have received a copy of the GNU Lesser General Public
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
16 License along with this library; if not, write to the Free Software
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
18
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
19 Sam Lantinga
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
20 slouken@libsdl.org
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
21 */
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
22 #include "SDL_config.h"
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
23
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
24 #include "SDL_video.h"
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
25 #include "SDL_blit.h"
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
26
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
27 /* The ONE TRUE BLITTER
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
28 * This puppy has to handle all the unoptimized cases - yes, it's slow.
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
29 */
2824
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
30 void
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
31 SDL_Blit_Slow(SDL_BlitInfo * info)
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
32 {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
33 const int flags = info->flags;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
34 const Uint32 modulateR = info->r;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
35 const Uint32 modulateG = info->g;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
36 const Uint32 modulateB = info->b;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
37 const Uint32 modulateA = info->a;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
38 Uint32 srcpixel;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
39 Uint32 srcR, srcG, srcB, srcA;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
40 Uint32 dstpixel;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
41 Uint32 dstR, dstG, dstB, dstA;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
42 int srcy, srcx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
43 int posy, posx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
44 int incy, incx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
45 SDL_PixelFormat *src_fmt = info->src_fmt;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
46 SDL_PixelFormat *dst_fmt = info->dst_fmt;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
47 int srcbpp = src_fmt->BytesPerPixel;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
48 int dstbpp = dst_fmt->BytesPerPixel;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
49
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
50 srcy = 0;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
51 posy = 0;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
52 incy = (info->src_h << 16) / info->dst_h;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
53 incx = (info->src_w << 16) / info->dst_w;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
54
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
55 while (info->dst_h--) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
56 Uint8 *src;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
57 Uint8 *dst = (Uint8 *) info->dst;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
58 int n = info->dst_w;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
59 srcx = -1;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
60 posx = 0x10000L;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
61 while (posy >= 0x10000L) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
62 ++srcy;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
63 posy -= 0x10000L;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
64 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
65 while (n--) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
66 if (posx >= 0x10000L) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
67 while (posx >= 0x10000L) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
68 ++srcx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
69 posx -= 0x10000L;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
70 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
71 src =
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
72 (info->src + (srcy * info->src_pitch) + (srcx * srcbpp));
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
73 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
74 if (src_fmt->Amask) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
75 DISEMBLE_RGBA(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
76 srcB, srcA);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
77 } else {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
78 DISEMBLE_RGB(src, srcbpp, src_fmt, srcpixel, srcR, srcG,
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
79 srcB);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
80 srcA = 0xFF;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
81 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
82 if (flags & SDL_COPY_COLORKEY) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
83 /* srcpixel isn't set for 24 bpp */
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
84 if (srcbpp == 24) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
85 srcpixel = (srcR << src_fmt->Rshift) |
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
86 (srcG << src_fmt->Gshift) | (srcB << src_fmt->Bshift);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
87 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
88 if (srcpixel == info->colorkey) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
89 posx += incx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
90 dst += dstbpp;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
91 continue;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
92 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
93 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
94 if (dst_fmt->Amask) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
95 DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
96 dstB, dstA);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
97 } else {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
98 DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG,
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
99 dstB);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
100 dstA = 0xFF;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
101 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
102
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
103 if (flags & SDL_COPY_MODULATE_COLOR) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
104 srcR = (srcR * modulateR) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
105 srcG = (srcG * modulateG) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
106 srcB = (srcB * modulateB) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
107 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
108 if (flags & SDL_COPY_MODULATE_ALPHA) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
109 srcA = (srcA * modulateA) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
110 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
111 if (flags & (SDL_COPY_BLEND | SDL_COPY_ADD)) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
112 /* This goes away if we ever use premultiplied alpha */
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
113 if (srcA < 255) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
114 srcR = (srcR * srcA) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
115 srcG = (srcG * srcA) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
116 srcB = (srcB * srcA) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
117 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
118 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
119 switch (flags &
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
120 (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
121 SDL_COPY_MOD)) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
122 case 0:
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
123 dstR = srcR;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
124 dstG = srcG;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
125 dstB = srcB;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
126 dstA = srcA;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
127 break;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
128 case SDL_COPY_MASK:
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
129 if (srcA) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
130 dstR = srcR;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
131 dstG = srcG;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
132 dstB = srcB;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
133 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
134 break;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
135 case SDL_COPY_BLEND:
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
136 dstR = srcR + ((255 - srcA) * dstR) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
137 dstG = srcG + ((255 - srcA) * dstG) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
138 dstB = srcB + ((255 - srcA) * dstB) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
139 break;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
140 case SDL_COPY_ADD:
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
141 dstR = srcR + dstR;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
142 if (dstR > 255)
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
143 dstR = 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
144 dstG = srcG + dstG;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
145 if (dstG > 255)
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
146 dstG = 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
147 dstB = srcB + dstB;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
148 if (dstB > 255)
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
149 dstB = 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
150 break;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
151 case SDL_COPY_MOD:
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
152 dstR = (srcR * dstR) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
153 dstG = (srcG * dstG) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
154 dstB = (srcB * dstB) / 255;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
155 break;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
156 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
157 if (dst_fmt->Amask) {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
158 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
159 } else {
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
160 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB);
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
161 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
162 posx += incx;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
163 dst += dstbpp;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
164 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
165 posy += incy;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
166 info->dst += info->dst_pitch;
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
167 }
4dba7aa7ea77 Added slow but complete blit fallback
Sam Lantinga <slouken@libsdl.org>
parents: 2256
diff changeset
168 }
2256
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169
e893d24ad8db Getting ready to add slow blitters. Everyone will love me. :)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170 /* vi: set ts=4 sw=4 expandtab: */