mirror of https://github.com/PCSX2/pcsx2.git
1023 lines
28 KiB
C
1023 lines
28 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* General (mostly internal) pixel/color manipulation routines for SDL */
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#include "SDL_endian.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_pixels_c.h"
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#include "SDL_RLEaccel_c.h"
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/* Helper functions */
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const char*
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SDL_GetPixelFormatName(Uint32 format)
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{
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switch (format) {
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#define CASE(X) case X: return #X;
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CASE(SDL_PIXELFORMAT_INDEX1LSB)
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CASE(SDL_PIXELFORMAT_INDEX1MSB)
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CASE(SDL_PIXELFORMAT_INDEX4LSB)
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CASE(SDL_PIXELFORMAT_INDEX4MSB)
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CASE(SDL_PIXELFORMAT_INDEX8)
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CASE(SDL_PIXELFORMAT_RGB332)
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CASE(SDL_PIXELFORMAT_RGB444)
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CASE(SDL_PIXELFORMAT_RGB555)
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CASE(SDL_PIXELFORMAT_BGR555)
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CASE(SDL_PIXELFORMAT_ARGB4444)
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CASE(SDL_PIXELFORMAT_RGBA4444)
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CASE(SDL_PIXELFORMAT_ABGR4444)
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CASE(SDL_PIXELFORMAT_BGRA4444)
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CASE(SDL_PIXELFORMAT_ARGB1555)
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CASE(SDL_PIXELFORMAT_RGBA5551)
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CASE(SDL_PIXELFORMAT_ABGR1555)
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CASE(SDL_PIXELFORMAT_BGRA5551)
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CASE(SDL_PIXELFORMAT_RGB565)
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CASE(SDL_PIXELFORMAT_BGR565)
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CASE(SDL_PIXELFORMAT_RGB24)
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CASE(SDL_PIXELFORMAT_BGR24)
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CASE(SDL_PIXELFORMAT_RGB888)
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CASE(SDL_PIXELFORMAT_BGR888)
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CASE(SDL_PIXELFORMAT_ARGB8888)
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CASE(SDL_PIXELFORMAT_RGBA8888)
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CASE(SDL_PIXELFORMAT_ABGR8888)
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CASE(SDL_PIXELFORMAT_BGRA8888)
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CASE(SDL_PIXELFORMAT_ARGB2101010)
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CASE(SDL_PIXELFORMAT_YV12)
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CASE(SDL_PIXELFORMAT_IYUV)
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CASE(SDL_PIXELFORMAT_YUY2)
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CASE(SDL_PIXELFORMAT_UYVY)
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CASE(SDL_PIXELFORMAT_YVYU)
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#undef CASE
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default:
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return "SDL_PIXELFORMAT_UNKNOWN";
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}
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}
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SDL_bool
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SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 * Rmask,
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Uint32 * Gmask, Uint32 * Bmask, Uint32 * Amask)
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{
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Uint32 masks[4];
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/* Initialize the values here */
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if (SDL_BYTESPERPIXEL(format) <= 2) {
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*bpp = SDL_BITSPERPIXEL(format);
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} else {
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*bpp = SDL_BYTESPERPIXEL(format) * 8;
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}
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*Rmask = *Gmask = *Bmask = *Amask = 0;
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if (format == SDL_PIXELFORMAT_RGB24) {
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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*Rmask = 0x00FF0000;
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*Gmask = 0x0000FF00;
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*Bmask = 0x000000FF;
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#else
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*Rmask = 0x000000FF;
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*Gmask = 0x0000FF00;
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*Bmask = 0x00FF0000;
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#endif
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return SDL_TRUE;
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}
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if (format == SDL_PIXELFORMAT_BGR24) {
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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*Rmask = 0x000000FF;
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*Gmask = 0x0000FF00;
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*Bmask = 0x00FF0000;
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#else
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*Rmask = 0x00FF0000;
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*Gmask = 0x0000FF00;
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*Bmask = 0x000000FF;
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#endif
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return SDL_TRUE;
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}
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if (SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED8 &&
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SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED16 &&
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SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED32) {
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/* Not a format that uses masks */
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return SDL_TRUE;
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}
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switch (SDL_PIXELLAYOUT(format)) {
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case SDL_PACKEDLAYOUT_332:
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masks[0] = 0x00000000;
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masks[1] = 0x000000E0;
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masks[2] = 0x0000001C;
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masks[3] = 0x00000003;
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break;
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case SDL_PACKEDLAYOUT_4444:
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masks[0] = 0x0000F000;
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masks[1] = 0x00000F00;
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masks[2] = 0x000000F0;
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masks[3] = 0x0000000F;
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break;
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case SDL_PACKEDLAYOUT_1555:
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masks[0] = 0x00008000;
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masks[1] = 0x00007C00;
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masks[2] = 0x000003E0;
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masks[3] = 0x0000001F;
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break;
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case SDL_PACKEDLAYOUT_5551:
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masks[0] = 0x0000F800;
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masks[1] = 0x000007C0;
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masks[2] = 0x0000003E;
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masks[3] = 0x00000001;
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break;
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case SDL_PACKEDLAYOUT_565:
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masks[0] = 0x00000000;
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masks[1] = 0x0000F800;
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masks[2] = 0x000007E0;
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masks[3] = 0x0000001F;
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break;
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case SDL_PACKEDLAYOUT_8888:
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masks[0] = 0xFF000000;
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masks[1] = 0x00FF0000;
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masks[2] = 0x0000FF00;
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masks[3] = 0x000000FF;
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break;
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case SDL_PACKEDLAYOUT_2101010:
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masks[0] = 0xC0000000;
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masks[1] = 0x3FF00000;
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masks[2] = 0x000FFC00;
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masks[3] = 0x000003FF;
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break;
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case SDL_PACKEDLAYOUT_1010102:
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masks[0] = 0xFFC00000;
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masks[1] = 0x003FF000;
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masks[2] = 0x00000FFC;
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masks[3] = 0x00000003;
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break;
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default:
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SDL_SetError("Unknown pixel format");
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return SDL_FALSE;
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}
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switch (SDL_PIXELORDER(format)) {
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case SDL_PACKEDORDER_XRGB:
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*Rmask = masks[1];
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*Gmask = masks[2];
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*Bmask = masks[3];
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break;
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case SDL_PACKEDORDER_RGBX:
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*Rmask = masks[0];
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*Gmask = masks[1];
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*Bmask = masks[2];
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break;
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case SDL_PACKEDORDER_ARGB:
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*Amask = masks[0];
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*Rmask = masks[1];
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*Gmask = masks[2];
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*Bmask = masks[3];
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break;
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case SDL_PACKEDORDER_RGBA:
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*Rmask = masks[0];
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*Gmask = masks[1];
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*Bmask = masks[2];
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*Amask = masks[3];
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break;
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case SDL_PACKEDORDER_XBGR:
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*Bmask = masks[1];
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*Gmask = masks[2];
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*Rmask = masks[3];
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break;
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case SDL_PACKEDORDER_BGRX:
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*Bmask = masks[0];
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*Gmask = masks[1];
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*Rmask = masks[2];
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break;
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case SDL_PACKEDORDER_BGRA:
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*Bmask = masks[0];
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*Gmask = masks[1];
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*Rmask = masks[2];
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*Amask = masks[3];
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break;
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case SDL_PACKEDORDER_ABGR:
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*Amask = masks[0];
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*Bmask = masks[1];
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*Gmask = masks[2];
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*Rmask = masks[3];
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break;
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default:
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SDL_SetError("Unknown pixel format");
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return SDL_FALSE;
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}
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return SDL_TRUE;
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}
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Uint32
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SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
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Uint32 Amask)
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{
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switch (bpp) {
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case 8:
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if (Rmask == 0) {
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return SDL_PIXELFORMAT_INDEX8;
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}
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if (Rmask == 0xE0 &&
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Gmask == 0x1C &&
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Bmask == 0x03 &&
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Amask == 0x00) {
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return SDL_PIXELFORMAT_RGB332;
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}
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break;
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case 12:
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if (Rmask == 0) {
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return SDL_PIXELFORMAT_RGB444;
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}
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if (Rmask == 0x0F00 &&
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Gmask == 0x00F0 &&
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Bmask == 0x000F &&
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Amask == 0x0000) {
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return SDL_PIXELFORMAT_RGB444;
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}
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break;
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case 15:
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if (Rmask == 0) {
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return SDL_PIXELFORMAT_RGB555;
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}
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/* Fall through to 16-bit checks */
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case 16:
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if (Rmask == 0) {
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return SDL_PIXELFORMAT_RGB565;
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}
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if (Rmask == 0x7C00 &&
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Gmask == 0x03E0 &&
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Bmask == 0x001F &&
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Amask == 0x0000) {
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return SDL_PIXELFORMAT_RGB555;
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}
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if (Rmask == 0x001F &&
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Gmask == 0x03E0 &&
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Bmask == 0x7C00 &&
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Amask == 0x0000) {
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return SDL_PIXELFORMAT_BGR555;
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}
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if (Rmask == 0x0F00 &&
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Gmask == 0x00F0 &&
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Bmask == 0x000F &&
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Amask == 0xF000) {
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return SDL_PIXELFORMAT_ARGB4444;
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}
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if (Rmask == 0xF000 &&
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Gmask == 0x0F00 &&
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Bmask == 0x00F0 &&
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Amask == 0x000F) {
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return SDL_PIXELFORMAT_RGBA4444;
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}
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if (Rmask == 0x000F &&
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Gmask == 0x00F0 &&
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Bmask == 0x0F00 &&
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Amask == 0xF000) {
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return SDL_PIXELFORMAT_ABGR4444;
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}
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if (Rmask == 0x00F0 &&
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Gmask == 0x0F00 &&
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Bmask == 0xF000 &&
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Amask == 0x000F) {
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return SDL_PIXELFORMAT_BGRA4444;
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}
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if (Rmask == 0x7C00 &&
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Gmask == 0x03E0 &&
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Bmask == 0x001F &&
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Amask == 0x8000) {
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return SDL_PIXELFORMAT_ARGB1555;
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}
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if (Rmask == 0xF800 &&
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Gmask == 0x07C0 &&
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Bmask == 0x003E &&
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Amask == 0x0001) {
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return SDL_PIXELFORMAT_RGBA5551;
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}
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if (Rmask == 0x001F &&
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Gmask == 0x03E0 &&
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Bmask == 0x7C00 &&
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Amask == 0x8000) {
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return SDL_PIXELFORMAT_ABGR1555;
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}
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if (Rmask == 0x003E &&
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Gmask == 0x07C0 &&
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Bmask == 0xF800 &&
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Amask == 0x0001) {
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return SDL_PIXELFORMAT_BGRA5551;
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}
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if (Rmask == 0xF800 &&
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Gmask == 0x07E0 &&
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Bmask == 0x001F &&
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Amask == 0x0000) {
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return SDL_PIXELFORMAT_RGB565;
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}
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if (Rmask == 0x001F &&
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Gmask == 0x07E0 &&
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Bmask == 0xF800 &&
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Amask == 0x0000) {
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return SDL_PIXELFORMAT_BGR565;
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}
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break;
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case 24:
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switch (Rmask) {
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case 0:
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case 0x00FF0000:
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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return SDL_PIXELFORMAT_RGB24;
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#else
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return SDL_PIXELFORMAT_BGR24;
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#endif
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case 0x000000FF:
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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return SDL_PIXELFORMAT_BGR24;
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#else
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return SDL_PIXELFORMAT_RGB24;
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#endif
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}
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case 32:
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if (Rmask == 0) {
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return SDL_PIXELFORMAT_RGB888;
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}
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if (Rmask == 0x00FF0000 &&
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Gmask == 0x0000FF00 &&
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Bmask == 0x000000FF &&
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Amask == 0x00000000) {
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return SDL_PIXELFORMAT_RGB888;
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}
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if (Rmask == 0x000000FF &&
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Gmask == 0x0000FF00 &&
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Bmask == 0x00FF0000 &&
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Amask == 0x00000000) {
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return SDL_PIXELFORMAT_BGR888;
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}
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if (Rmask == 0x00FF0000 &&
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Gmask == 0x0000FF00 &&
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Bmask == 0x000000FF &&
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Amask == 0xFF000000) {
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return SDL_PIXELFORMAT_ARGB8888;
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}
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if (Rmask == 0xFF000000 &&
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Gmask == 0x00FF0000 &&
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Bmask == 0x0000FF00 &&
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Amask == 0x000000FF) {
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return SDL_PIXELFORMAT_RGBA8888;
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}
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if (Rmask == 0x000000FF &&
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Gmask == 0x0000FF00 &&
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Bmask == 0x00FF0000 &&
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Amask == 0xFF000000) {
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return SDL_PIXELFORMAT_ABGR8888;
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}
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if (Rmask == 0x0000FF00 &&
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Gmask == 0x00FF0000 &&
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Bmask == 0xFF000000 &&
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Amask == 0x000000FF) {
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return SDL_PIXELFORMAT_BGRA8888;
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}
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if (Rmask == 0x3FF00000 &&
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Gmask == 0x000FFC00 &&
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Bmask == 0x000003FF &&
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Amask == 0xC0000000) {
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return SDL_PIXELFORMAT_ARGB2101010;
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}
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}
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return SDL_PIXELFORMAT_UNKNOWN;
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}
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static SDL_PixelFormat *formats;
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SDL_PixelFormat *
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SDL_AllocFormat(Uint32 pixel_format)
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{
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SDL_PixelFormat *format;
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if (SDL_ISPIXELFORMAT_FOURCC(pixel_format)) {
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SDL_SetError("FOURCC pixel formats are not supported");
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return NULL;
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}
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/* Look it up in our list of previously allocated formats */
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for (format = formats; format; format = format->next) {
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if (pixel_format == format->format) {
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++format->refcount;
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return format;
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}
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}
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/* Allocate an empty pixel format structure, and initialize it */
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format = SDL_malloc(sizeof(*format));
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if (format == NULL) {
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SDL_OutOfMemory();
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return (NULL);
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}
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SDL_InitFormat(format, pixel_format);
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if (!SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
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/* Cache the RGB formats */
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format->next = formats;
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formats = format;
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}
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return format;
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}
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int
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SDL_InitFormat(SDL_PixelFormat * format, Uint32 pixel_format)
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{
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int bpp;
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Uint32 Rmask, Gmask, Bmask, Amask;
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Uint32 mask;
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if (!SDL_PixelFormatEnumToMasks(pixel_format, &bpp,
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&Rmask, &Gmask, &Bmask, &Amask)) {
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SDL_SetError("Unknown pixel format");
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return -1;
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}
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/* Set up the format */
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SDL_zerop(format);
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format->format = pixel_format;
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format->BitsPerPixel = bpp;
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format->BytesPerPixel = (bpp + 7) / 8;
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if (Rmask || Bmask || Gmask) { /* Packed pixels with custom mask */
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format->Rshift = 0;
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format->Rloss = 8;
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if (Rmask) {
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for (mask = Rmask; !(mask & 0x01); mask >>= 1)
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++format->Rshift;
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for (; (mask & 0x01); mask >>= 1)
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--format->Rloss;
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}
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format->Gshift = 0;
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format->Gloss = 8;
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if (Gmask) {
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for (mask = Gmask; !(mask & 0x01); mask >>= 1)
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++format->Gshift;
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for (; (mask & 0x01); mask >>= 1)
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--format->Gloss;
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}
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format->Bshift = 0;
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format->Bloss = 8;
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if (Bmask) {
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for (mask = Bmask; !(mask & 0x01); mask >>= 1)
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++format->Bshift;
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for (; (mask & 0x01); mask >>= 1)
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--format->Bloss;
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}
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format->Ashift = 0;
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format->Aloss = 8;
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if (Amask) {
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for (mask = Amask; !(mask & 0x01); mask >>= 1)
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++format->Ashift;
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for (; (mask & 0x01); mask >>= 1)
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--format->Aloss;
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}
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format->Rmask = Rmask;
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format->Gmask = Gmask;
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format->Bmask = Bmask;
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format->Amask = Amask;
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} else if (bpp > 8) { /* Packed pixels with standard mask */
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/* R-G-B */
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if (bpp > 24)
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bpp = 24;
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format->Rloss = 8 - (bpp / 3);
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format->Gloss = 8 - (bpp / 3) - (bpp % 3);
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format->Bloss = 8 - (bpp / 3);
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format->Rshift = ((bpp / 3) + (bpp % 3)) + (bpp / 3);
|
|
format->Gshift = (bpp / 3);
|
|
format->Bshift = 0;
|
|
format->Rmask = ((0xFF >> format->Rloss) << format->Rshift);
|
|
format->Gmask = ((0xFF >> format->Gloss) << format->Gshift);
|
|
format->Bmask = ((0xFF >> format->Bloss) << format->Bshift);
|
|
} else {
|
|
/* Palettized formats have no mask info */
|
|
format->Rloss = 8;
|
|
format->Gloss = 8;
|
|
format->Bloss = 8;
|
|
format->Aloss = 8;
|
|
format->Rshift = 0;
|
|
format->Gshift = 0;
|
|
format->Bshift = 0;
|
|
format->Ashift = 0;
|
|
format->Rmask = 0;
|
|
format->Gmask = 0;
|
|
format->Bmask = 0;
|
|
format->Amask = 0;
|
|
}
|
|
format->palette = NULL;
|
|
format->refcount = 1;
|
|
format->next = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
SDL_FreeFormat(SDL_PixelFormat *format)
|
|
{
|
|
SDL_PixelFormat *prev;
|
|
|
|
if (!format) {
|
|
return;
|
|
}
|
|
if (--format->refcount > 0) {
|
|
return;
|
|
}
|
|
|
|
/* Remove this format from our list */
|
|
if (format == formats) {
|
|
formats = format->next;
|
|
} else if (formats) {
|
|
for (prev = formats; prev->next; prev = prev->next) {
|
|
if (prev->next == format) {
|
|
prev->next = format->next;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (format->palette) {
|
|
SDL_FreePalette(format->palette);
|
|
}
|
|
SDL_free(format);
|
|
}
|
|
|
|
SDL_Palette *
|
|
SDL_AllocPalette(int ncolors)
|
|
{
|
|
SDL_Palette *palette;
|
|
|
|
palette = (SDL_Palette *) SDL_malloc(sizeof(*palette));
|
|
if (!palette) {
|
|
SDL_OutOfMemory();
|
|
return NULL;
|
|
}
|
|
palette->colors =
|
|
(SDL_Color *) SDL_malloc(ncolors * sizeof(*palette->colors));
|
|
if (!palette->colors) {
|
|
SDL_free(palette);
|
|
return NULL;
|
|
}
|
|
palette->ncolors = ncolors;
|
|
palette->version = 1;
|
|
palette->refcount = 1;
|
|
|
|
SDL_memset(palette->colors, 0xFF, ncolors * sizeof(*palette->colors));
|
|
|
|
return palette;
|
|
}
|
|
|
|
int
|
|
SDL_SetPixelFormatPalette(SDL_PixelFormat * format, SDL_Palette *palette)
|
|
{
|
|
if (!format) {
|
|
SDL_SetError("SDL_SetPixelFormatPalette() passed NULL format");
|
|
return -1;
|
|
}
|
|
|
|
if (palette && palette->ncolors != (1 << format->BitsPerPixel)) {
|
|
SDL_SetError("SDL_SetPixelFormatPalette() passed a palette that doesn't match the format");
|
|
return -1;
|
|
}
|
|
|
|
if (format->palette == palette) {
|
|
return 0;
|
|
}
|
|
|
|
if (format->palette) {
|
|
SDL_FreePalette(format->palette);
|
|
}
|
|
|
|
format->palette = palette;
|
|
|
|
if (format->palette) {
|
|
++format->palette->refcount;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
SDL_SetPaletteColors(SDL_Palette * palette, const SDL_Color * colors,
|
|
int firstcolor, int ncolors)
|
|
{
|
|
int status = 0;
|
|
|
|
/* Verify the parameters */
|
|
if (!palette) {
|
|
return -1;
|
|
}
|
|
if (ncolors > (palette->ncolors - firstcolor)) {
|
|
ncolors = (palette->ncolors - firstcolor);
|
|
status = -1;
|
|
}
|
|
|
|
if (colors != (palette->colors + firstcolor)) {
|
|
SDL_memcpy(palette->colors + firstcolor, colors,
|
|
ncolors * sizeof(*colors));
|
|
}
|
|
++palette->version;
|
|
if (!palette->version) {
|
|
palette->version = 1;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void
|
|
SDL_FreePalette(SDL_Palette * palette)
|
|
{
|
|
if (!palette) {
|
|
return;
|
|
}
|
|
if (--palette->refcount > 0) {
|
|
return;
|
|
}
|
|
if (palette->colors) {
|
|
SDL_free(palette->colors);
|
|
}
|
|
SDL_free(palette);
|
|
}
|
|
|
|
/*
|
|
* Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
|
|
*/
|
|
void
|
|
SDL_DitherColors(SDL_Color * colors, int bpp)
|
|
{
|
|
int i;
|
|
if (bpp != 8)
|
|
return; /* only 8bpp supported right now */
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
int r, g, b;
|
|
/* map each bit field to the full [0, 255] interval,
|
|
so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
|
|
r = i & 0xe0;
|
|
r |= r >> 3 | r >> 6;
|
|
colors[i].r = r;
|
|
g = (i << 3) & 0xe0;
|
|
g |= g >> 3 | g >> 6;
|
|
colors[i].g = g;
|
|
b = i & 0x3;
|
|
b |= b << 2;
|
|
b |= b << 4;
|
|
colors[i].b = b;
|
|
colors[i].unused = SDL_ALPHA_OPAQUE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calculate the pad-aligned scanline width of a surface
|
|
*/
|
|
int
|
|
SDL_CalculatePitch(SDL_Surface * surface)
|
|
{
|
|
int pitch;
|
|
|
|
/* Surface should be 4-byte aligned for speed */
|
|
pitch = surface->w * surface->format->BytesPerPixel;
|
|
switch (surface->format->BitsPerPixel) {
|
|
case 1:
|
|
pitch = (pitch + 7) / 8;
|
|
break;
|
|
case 4:
|
|
pitch = (pitch + 1) / 2;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
pitch = (pitch + 3) & ~3; /* 4-byte aligning */
|
|
return (pitch);
|
|
}
|
|
|
|
/*
|
|
* Match an RGB value to a particular palette index
|
|
*/
|
|
Uint8
|
|
SDL_FindColor(SDL_Palette * pal, Uint8 r, Uint8 g, Uint8 b)
|
|
{
|
|
/* Do colorspace distance matching */
|
|
unsigned int smallest;
|
|
unsigned int distance;
|
|
int rd, gd, bd;
|
|
int i;
|
|
Uint8 pixel = 0;
|
|
|
|
smallest = ~0;
|
|
for (i = 0; i < pal->ncolors; ++i) {
|
|
rd = pal->colors[i].r - r;
|
|
gd = pal->colors[i].g - g;
|
|
bd = pal->colors[i].b - b;
|
|
distance = (rd * rd) + (gd * gd) + (bd * bd);
|
|
if (distance < smallest) {
|
|
pixel = i;
|
|
if (distance == 0) { /* Perfect match! */
|
|
break;
|
|
}
|
|
smallest = distance;
|
|
}
|
|
}
|
|
return (pixel);
|
|
}
|
|
|
|
/* Find the opaque pixel value corresponding to an RGB triple */
|
|
Uint32
|
|
SDL_MapRGB(const SDL_PixelFormat * format, Uint8 r, Uint8 g, Uint8 b)
|
|
{
|
|
if (format->palette == NULL) {
|
|
return (r >> format->Rloss) << format->Rshift
|
|
| (g >> format->Gloss) << format->Gshift
|
|
| (b >> format->Bloss) << format->Bshift | format->Amask;
|
|
} else {
|
|
return SDL_FindColor(format->palette, r, g, b);
|
|
}
|
|
}
|
|
|
|
/* Find the pixel value corresponding to an RGBA quadruple */
|
|
Uint32
|
|
SDL_MapRGBA(const SDL_PixelFormat * format, Uint8 r, Uint8 g, Uint8 b,
|
|
Uint8 a)
|
|
{
|
|
if (format->palette == NULL) {
|
|
return (r >> format->Rloss) << format->Rshift
|
|
| (g >> format->Gloss) << format->Gshift
|
|
| (b >> format->Bloss) << format->Bshift
|
|
| ((a >> format->Aloss) << format->Ashift & format->Amask);
|
|
} else {
|
|
return SDL_FindColor(format->palette, r, g, b);
|
|
}
|
|
}
|
|
|
|
void
|
|
SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * format, Uint8 * r, Uint8 * g,
|
|
Uint8 * b)
|
|
{
|
|
if (format->palette == NULL) {
|
|
/*
|
|
* This makes sure that the result is mapped to the
|
|
* interval [0..255], and the maximum value for each
|
|
* component is 255. This is important to make sure
|
|
* that white is indeed reported as (255, 255, 255).
|
|
* This only works for RGB bit fields at least 4 bit
|
|
* wide, which is almost always the case.
|
|
*/
|
|
unsigned v;
|
|
v = (pixel & format->Rmask) >> format->Rshift;
|
|
*r = (v << format->Rloss) + (v >> (8 - (format->Rloss << 1)));
|
|
v = (pixel & format->Gmask) >> format->Gshift;
|
|
*g = (v << format->Gloss) + (v >> (8 - (format->Gloss << 1)));
|
|
v = (pixel & format->Bmask) >> format->Bshift;
|
|
*b = (v << format->Bloss) + (v >> (8 - (format->Bloss << 1)));
|
|
} else {
|
|
*r = format->palette->colors[pixel].r;
|
|
*g = format->palette->colors[pixel].g;
|
|
*b = format->palette->colors[pixel].b;
|
|
}
|
|
}
|
|
|
|
void
|
|
SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format,
|
|
Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
|
|
{
|
|
if (format->palette == NULL) {
|
|
/*
|
|
* This makes sure that the result is mapped to the
|
|
* interval [0..255], and the maximum value for each
|
|
* component is 255. This is important to make sure
|
|
* that white is indeed reported as (255, 255, 255),
|
|
* and that opaque alpha is 255.
|
|
* This only works for RGB bit fields at least 4 bit
|
|
* wide, which is almost always the case.
|
|
*/
|
|
unsigned v;
|
|
v = (pixel & format->Rmask) >> format->Rshift;
|
|
*r = (v << format->Rloss) + (v >> (8 - (format->Rloss << 1)));
|
|
v = (pixel & format->Gmask) >> format->Gshift;
|
|
*g = (v << format->Gloss) + (v >> (8 - (format->Gloss << 1)));
|
|
v = (pixel & format->Bmask) >> format->Bshift;
|
|
*b = (v << format->Bloss) + (v >> (8 - (format->Bloss << 1)));
|
|
if (format->Amask) {
|
|
v = (pixel & format->Amask) >> format->Ashift;
|
|
*a = (v << format->Aloss) + (v >> (8 - (format->Aloss << 1)));
|
|
} else {
|
|
*a = SDL_ALPHA_OPAQUE;
|
|
}
|
|
} else {
|
|
*r = format->palette->colors[pixel].r;
|
|
*g = format->palette->colors[pixel].g;
|
|
*b = format->palette->colors[pixel].b;
|
|
*a = SDL_ALPHA_OPAQUE;
|
|
}
|
|
}
|
|
|
|
/* Map from Palette to Palette */
|
|
static Uint8 *
|
|
Map1to1(SDL_Palette * src, SDL_Palette * dst, int *identical)
|
|
{
|
|
Uint8 *map;
|
|
int i;
|
|
|
|
if (identical) {
|
|
if (src->ncolors <= dst->ncolors) {
|
|
/* If an identical palette, no need to map */
|
|
if (src == dst
|
|
||
|
|
(SDL_memcmp
|
|
(src->colors, dst->colors,
|
|
src->ncolors * sizeof(SDL_Color)) == 0)) {
|
|
*identical = 1;
|
|
return (NULL);
|
|
}
|
|
}
|
|
*identical = 0;
|
|
}
|
|
map = (Uint8 *) SDL_malloc(src->ncolors);
|
|
if (map == NULL) {
|
|
SDL_OutOfMemory();
|
|
return (NULL);
|
|
}
|
|
for (i = 0; i < src->ncolors; ++i) {
|
|
map[i] = SDL_FindColor(dst,
|
|
src->colors[i].r, src->colors[i].g,
|
|
src->colors[i].b);
|
|
}
|
|
return (map);
|
|
}
|
|
|
|
/* Map from Palette to BitField */
|
|
static Uint8 *
|
|
Map1toN(SDL_PixelFormat * src, Uint8 Rmod, Uint8 Gmod, Uint8 Bmod, Uint8 Amod,
|
|
SDL_PixelFormat * dst)
|
|
{
|
|
Uint8 *map;
|
|
int i;
|
|
int bpp;
|
|
SDL_Palette *pal = src->palette;
|
|
|
|
bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
|
|
map = (Uint8 *) SDL_malloc(pal->ncolors * bpp);
|
|
if (map == NULL) {
|
|
SDL_OutOfMemory();
|
|
return (NULL);
|
|
}
|
|
|
|
/* We memory copy to the pixel map so the endianness is preserved */
|
|
for (i = 0; i < pal->ncolors; ++i) {
|
|
Uint8 A = Amod;
|
|
Uint8 R = (Uint8) ((pal->colors[i].r * Rmod) / 255);
|
|
Uint8 G = (Uint8) ((pal->colors[i].g * Gmod) / 255);
|
|
Uint8 B = (Uint8) ((pal->colors[i].b * Bmod) / 255);
|
|
ASSEMBLE_RGBA(&map[i * bpp], dst->BytesPerPixel, dst, R, G, B, A);
|
|
}
|
|
return (map);
|
|
}
|
|
|
|
/* Map from BitField to Dithered-Palette to Palette */
|
|
static Uint8 *
|
|
MapNto1(SDL_PixelFormat * src, SDL_PixelFormat * dst, int *identical)
|
|
{
|
|
/* Generate a 256 color dither palette */
|
|
SDL_Palette dithered;
|
|
SDL_Color colors[256];
|
|
SDL_Palette *pal = dst->palette;
|
|
|
|
dithered.ncolors = 256;
|
|
SDL_DitherColors(colors, 8);
|
|
dithered.colors = colors;
|
|
return (Map1to1(&dithered, pal, identical));
|
|
}
|
|
|
|
SDL_BlitMap *
|
|
SDL_AllocBlitMap(void)
|
|
{
|
|
SDL_BlitMap *map;
|
|
|
|
/* Allocate the empty map */
|
|
map = (SDL_BlitMap *) SDL_calloc(1, sizeof(*map));
|
|
if (map == NULL) {
|
|
SDL_OutOfMemory();
|
|
return (NULL);
|
|
}
|
|
map->info.r = 0xFF;
|
|
map->info.g = 0xFF;
|
|
map->info.b = 0xFF;
|
|
map->info.a = 0xFF;
|
|
|
|
/* It's ready to go */
|
|
return (map);
|
|
}
|
|
|
|
void
|
|
SDL_InvalidateMap(SDL_BlitMap * map)
|
|
{
|
|
if (!map) {
|
|
return;
|
|
}
|
|
map->dst = NULL;
|
|
map->palette_version = 0;
|
|
if (map->info.table) {
|
|
SDL_free(map->info.table);
|
|
map->info.table = NULL;
|
|
}
|
|
}
|
|
|
|
int
|
|
SDL_MapSurface(SDL_Surface * src, SDL_Surface * dst)
|
|
{
|
|
SDL_PixelFormat *srcfmt;
|
|
SDL_PixelFormat *dstfmt;
|
|
SDL_BlitMap *map;
|
|
|
|
/* Clear out any previous mapping */
|
|
map = src->map;
|
|
if ((src->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
|
|
SDL_UnRLESurface(src, 1);
|
|
}
|
|
SDL_InvalidateMap(map);
|
|
|
|
/* Figure out what kind of mapping we're doing */
|
|
map->identity = 0;
|
|
srcfmt = src->format;
|
|
dstfmt = dst->format;
|
|
if (SDL_ISPIXELFORMAT_INDEXED(srcfmt->format)) {
|
|
if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) {
|
|
/* Palette --> Palette */
|
|
map->info.table =
|
|
Map1to1(srcfmt->palette, dstfmt->palette, &map->identity);
|
|
if (!map->identity) {
|
|
if (map->info.table == NULL) {
|
|
return (-1);
|
|
}
|
|
}
|
|
if (srcfmt->BitsPerPixel != dstfmt->BitsPerPixel)
|
|
map->identity = 0;
|
|
} else {
|
|
/* Palette --> BitField */
|
|
map->info.table =
|
|
Map1toN(srcfmt, src->map->info.r, src->map->info.g,
|
|
src->map->info.b, src->map->info.a, dstfmt);
|
|
if (map->info.table == NULL) {
|
|
return (-1);
|
|
}
|
|
}
|
|
} else {
|
|
if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) {
|
|
/* BitField --> Palette */
|
|
map->info.table = MapNto1(srcfmt, dstfmt, &map->identity);
|
|
if (!map->identity) {
|
|
if (map->info.table == NULL) {
|
|
return (-1);
|
|
}
|
|
}
|
|
map->identity = 0; /* Don't optimize to copy */
|
|
} else {
|
|
/* BitField --> BitField */
|
|
if (srcfmt == dstfmt) {
|
|
map->identity = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
map->dst = dst;
|
|
|
|
if (dstfmt->palette) {
|
|
map->palette_version = dstfmt->palette->version;
|
|
} else {
|
|
map->palette_version = 0;
|
|
}
|
|
|
|
/* Choose your blitters wisely */
|
|
return (SDL_CalculateBlit(src));
|
|
}
|
|
|
|
void
|
|
SDL_FreeBlitMap(SDL_BlitMap * map)
|
|
{
|
|
if (map) {
|
|
SDL_InvalidateMap(map);
|
|
SDL_free(map);
|
|
}
|
|
}
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|