| author | Sam Lantinga <slouken@libsdl.org> |
| Tue, 02 Dec 2008 17:14:04 +0000 | |
| changeset 2824 | 4dba7aa7ea77 |
| parent 2256 | e893d24ad8db |
| child 2859 | 99210400e8b9 |
| permissions | -rw-r--r-- |
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Getting ready to add slow blitters. Everyone will love me. :)
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1 |
/* |
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2 |
SDL - Simple DirectMedia Layer |
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3 |
Copyright (C) 1997-2006 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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Getting ready to add slow blitters. Everyone will love me. :)
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13 |
Lesser General Public License for more details. |
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Getting ready to add slow blitters. Everyone will love me. :)
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14 |
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Getting ready to add slow blitters. Everyone will love me. :)
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15 |
You should have received a copy of the GNU Lesser General Public |
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Getting ready to add slow blitters. Everyone will love me. :)
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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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19 |
Sam Lantinga |
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20 |
slouken@libsdl.org |
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*/ |
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22 |
#include "SDL_config.h" |
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#include "SDL_video.h" |
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#include "SDL_blit.h" |
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/* The ONE TRUE BLITTER |
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* This puppy has to handle all the unoptimized cases - yes, it's slow. |
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*/ |
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void |
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SDL_Blit_Slow(SDL_BlitInfo * info) |
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{
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const int flags = info->flags; |
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const Uint32 modulateR = info->r; |
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const Uint32 modulateG = info->g; |
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const Uint32 modulateB = info->b; |
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const Uint32 modulateA = info->a; |
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Uint32 srcpixel; |
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Uint32 srcR, srcG, srcB, srcA; |
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Uint32 dstpixel; |
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Uint32 dstR, dstG, dstB, dstA; |
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int srcy, srcx; |
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int posy, posx; |
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int incy, incx; |
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SDL_PixelFormat *src_fmt = info->src_fmt; |
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SDL_PixelFormat *dst_fmt = info->dst_fmt; |
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int srcbpp = src_fmt->BytesPerPixel; |
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int dstbpp = dst_fmt->BytesPerPixel; |
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srcy = 0; |
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posy = 0; |
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incy = (info->src_h << 16) / info->dst_h; |
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incx = (info->src_w << 16) / info->dst_w; |
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while (info->dst_h--) {
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Uint8 *src; |
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Uint8 *dst = (Uint8 *) info->dst; |
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int n = info->dst_w; |
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srcx = -1; |
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posx = 0x10000L; |
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while (posy >= 0x10000L) {
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++srcy; |
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posy -= 0x10000L; |
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} |
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while (n--) {
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if (posx >= 0x10000L) {
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while (posx >= 0x10000L) {
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++srcx; |
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posx -= 0x10000L; |
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} |
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src = |
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(info->src + (srcy * info->src_pitch) + (srcx * srcbpp)); |
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} |
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if (src_fmt->Amask) {
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DISEMBLE_RGBA(src, srcbpp, src_fmt, srcpixel, srcR, srcG, |
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srcB, srcA); |
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} else {
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DISEMBLE_RGB(src, srcbpp, src_fmt, srcpixel, srcR, srcG, |
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srcB); |
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srcA = 0xFF; |
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} |
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if (flags & SDL_COPY_COLORKEY) {
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/* srcpixel isn't set for 24 bpp */ |
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if (srcbpp == 24) {
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srcpixel = (srcR << src_fmt->Rshift) | |
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(srcG << src_fmt->Gshift) | (srcB << src_fmt->Bshift); |
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} |
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if (srcpixel == info->colorkey) {
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posx += incx; |
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dst += dstbpp; |
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continue; |
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} |
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} |
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if (dst_fmt->Amask) {
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DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, |
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dstB, dstA); |
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} else {
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DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, |
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dstB); |
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dstA = 0xFF; |
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} |
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if (flags & SDL_COPY_MODULATE_COLOR) {
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srcR = (srcR * modulateR) / 255; |
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srcG = (srcG * modulateG) / 255; |
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srcB = (srcB * modulateB) / 255; |
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} |
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if (flags & SDL_COPY_MODULATE_ALPHA) {
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srcA = (srcA * modulateA) / 255; |
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} |
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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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srcR = (srcR * srcA) / 255; |
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115 |
srcG = (srcG * srcA) / 255; |
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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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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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Getting ready to add slow blitters. Everyone will love me. :)
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169 |
|
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|
170 |
/* vi: set ts=4 sw=4 expandtab: */ |