Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_slow.c @ 3168:6338b7f2d024
Hi,
I have prepared a set of patches to readd WindowsCE support to SDL 1.3.
I've created a new GAPI/Rawframebuffer and a DirectDraw renderer.
Both renderers are work in progress and there are several unimplemented
cases. (Notably
RenderLine/RenderPoint/RenderFill/QueryTexturePixels/UpdateTexture and
texture blending )
Nevertheless I am successfully using these renderers together with the
SDL software renderer. (On most devices the SDL software renderer will
be much faster as there are only badly optimized vendor drivers available)
I send these patches now in this unpolished state because there seems to
be some interest in win ce and someone has to start supporting SDL 1.3
Now on to the patches:
wince_events_window_fixes.patch
fixes some wince incompatibilities and adds fullscreen support via
SHFullScreen. NOTE: This patch shouldn't have any side effects on
Windows, but I have NOT tested it on Windows, so please double-check.
This patch doesn't dependent on the following ones.
wince_renderers_system.patch
This patch does all necessary modifications to the SDL system.
- it adds the renderers to the configure system
- it adds the renderers to win32video
SDL_ceddrawrender.c
SDL_ceddrawrender.h
SDL_gapirender_c.h
SDL_gapirender.c
SDL_gapirender.h
these files add the new render drivers and should be placed in
src/video/win32
Some notes to people who want to test this:
- I have only compiled sdl with ming32ce, so the VisualC files are not
up to date
- As mingw32ce has no ddraw.h this file must be taken from the MS SDK
and modified to work with gcc
- I had to modify line 2611 in configure.in to
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lcoredll -lcommctrl -lmmtimer
-Wl,--image-base -Wl,0x10000"
otherwise GetCPinfo wouldn't link. If someone knows whats causing this
I'd be happy to hear about it.
It would be great if these patches could make their way into SVN as this
would make collaboration much much easier.
I'm out of office for the next week and therefore will be unavailable
via email.
Regards
Stefan
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 07 Jun 2009 02:44:46 +0000 |
parents | 99210400e8b9 |
children | c5fe76962106 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #include "SDL_video.h" |
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25 #include "SDL_blit.h" |
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26 |
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27 /* The ONE TRUE BLITTER |
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28 * This puppy has to handle all the unoptimized cases - yes, it's slow. |
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29 */ |
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30 void |
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31 SDL_Blit_Slow(SDL_BlitInfo * info) |
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32 { |
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33 const int flags = info->flags; |
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34 const Uint32 modulateR = info->r; |
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35 const Uint32 modulateG = info->g; |
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36 const Uint32 modulateB = info->b; |
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37 const Uint32 modulateA = info->a; |
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38 Uint32 srcpixel; |
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39 Uint32 srcR, srcG, srcB, srcA; |
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40 Uint32 dstpixel; |
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41 Uint32 dstR, dstG, dstB, dstA; |
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42 int srcy, srcx; |
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43 int posy, posx; |
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44 int incy, incx; |
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45 SDL_PixelFormat *src_fmt = info->src_fmt; |
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46 SDL_PixelFormat *dst_fmt = info->dst_fmt; |
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47 int srcbpp = src_fmt->BytesPerPixel; |
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48 int dstbpp = dst_fmt->BytesPerPixel; |
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49 |
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50 srcy = 0; |
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51 posy = 0; |
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52 incy = (info->src_h << 16) / info->dst_h; |
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53 incx = (info->src_w << 16) / info->dst_w; |
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54 |
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55 while (info->dst_h--) { |
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56 Uint8 *src; |
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57 Uint8 *dst = (Uint8 *) info->dst; |
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58 int n = info->dst_w; |
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59 srcx = -1; |
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60 posx = 0x10000L; |
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61 while (posy >= 0x10000L) { |
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62 ++srcy; |
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63 posy -= 0x10000L; |
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64 } |
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65 while (n--) { |
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66 if (posx >= 0x10000L) { |
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67 while (posx >= 0x10000L) { |
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68 ++srcx; |
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69 posx -= 0x10000L; |
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70 } |
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71 src = |
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72 (info->src + (srcy * info->src_pitch) + (srcx * srcbpp)); |
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73 } |
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74 if (src_fmt->Amask) { |
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75 DISEMBLE_RGBA(src, srcbpp, src_fmt, srcpixel, srcR, srcG, |
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76 srcB, srcA); |
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77 } else { |
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78 DISEMBLE_RGB(src, srcbpp, src_fmt, srcpixel, srcR, srcG, |
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79 srcB); |
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80 srcA = 0xFF; |
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81 } |
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82 if (flags & SDL_COPY_COLORKEY) { |
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83 /* srcpixel isn't set for 24 bpp */ |
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84 if (srcbpp == 24) { |
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85 srcpixel = (srcR << src_fmt->Rshift) | |
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86 (srcG << src_fmt->Gshift) | (srcB << src_fmt->Bshift); |
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87 } |
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88 if (srcpixel == info->colorkey) { |
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89 posx += incx; |
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90 dst += dstbpp; |
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91 continue; |
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92 } |
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93 } |
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94 if (dst_fmt->Amask) { |
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95 DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, |
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96 dstB, dstA); |
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97 } else { |
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98 DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, |
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99 dstB); |
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100 dstA = 0xFF; |
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101 } |
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102 |
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103 if (flags & SDL_COPY_MODULATE_COLOR) { |
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104 srcR = (srcR * modulateR) / 255; |
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105 srcG = (srcG * modulateG) / 255; |
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106 srcB = (srcB * modulateB) / 255; |
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107 } |
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108 if (flags & SDL_COPY_MODULATE_ALPHA) { |
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109 srcA = (srcA * modulateA) / 255; |
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110 } |
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111 if (flags & (SDL_COPY_BLEND | SDL_COPY_ADD)) { |
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112 /* This goes away if we ever use premultiplied alpha */ |
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113 if (srcA < 255) { |
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114 srcR = (srcR * srcA) / 255; |
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115 srcG = (srcG * srcA) / 255; |
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116 srcB = (srcB * srcA) / 255; |
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117 } |
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118 } |
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119 switch (flags & |
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120 (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | |
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121 SDL_COPY_MOD)) { |
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122 case 0: |
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123 dstR = srcR; |
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124 dstG = srcG; |
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125 dstB = srcB; |
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126 dstA = srcA; |
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127 break; |
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128 case SDL_COPY_MASK: |
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129 if (srcA) { |
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130 dstR = srcR; |
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131 dstG = srcG; |
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132 dstB = srcB; |
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133 } |
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134 break; |
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135 case SDL_COPY_BLEND: |
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136 dstR = srcR + ((255 - srcA) * dstR) / 255; |
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137 dstG = srcG + ((255 - srcA) * dstG) / 255; |
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138 dstB = srcB + ((255 - srcA) * dstB) / 255; |
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139 break; |
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140 case SDL_COPY_ADD: |
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141 dstR = srcR + dstR; |
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142 if (dstR > 255) |
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143 dstR = 255; |
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144 dstG = srcG + dstG; |
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145 if (dstG > 255) |
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146 dstG = 255; |
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147 dstB = srcB + dstB; |
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148 if (dstB > 255) |
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149 dstB = 255; |
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150 break; |
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151 case SDL_COPY_MOD: |
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152 dstR = (srcR * dstR) / 255; |
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153 dstG = (srcG * dstG) / 255; |
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154 dstB = (srcB * dstB) / 255; |
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155 break; |
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156 } |
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157 if (dst_fmt->Amask) { |
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158 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA); |
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159 } else { |
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160 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB); |
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161 } |
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162 posx += incx; |
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163 dst += dstbpp; |
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164 } |
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165 posy += incy; |
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166 info->dst += info->dst_pitch; |
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167 } |
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168 } |
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169 |
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170 /* vi: set ts=4 sw=4 expandtab: */ |