src/video/SDL_pixels.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 12 Jan 2011 14:53:23 -0800
changeset 4982 660d3a432102
parent 3697 f7b03b6838cb
child 4983 b49d3869ebd2
permissions -rw-r--r--
Added some missing pixel formats and SDL_GetPixelFormatName()
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 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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struct SDL_PaletteWatch
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{
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    SDL_PaletteChangedFunc callback;
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    void *userdata;
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    struct SDL_PaletteWatch *next;
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};
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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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        switch (Rmask) {
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        case 0:
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            return SDL_PIXELFORMAT_INDEX8;
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        case 0xE0:
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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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        switch (Rmask) {
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        case 0x0F00:
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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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        switch (Rmask) {
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        case 0x001F:
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            return SDL_PIXELFORMAT_BGR555;
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        case 0x7C00:
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            return SDL_PIXELFORMAT_RGB555;
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        }
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        break;
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    case 16:
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        switch (Rmask) {
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        case 0x000F:
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            return SDL_PIXELFORMAT_ABGR4444;
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        case 0x001F:
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            if (Gmask == 0x07E0) {
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                return SDL_PIXELFORMAT_BGR565;
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            }
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            return SDL_PIXELFORMAT_ABGR1555;
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        case 0x0F00:
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            return SDL_PIXELFORMAT_ARGB4444;
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        case 0x7C00:
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            return SDL_PIXELFORMAT_ARGB1555;
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        case 0xF800:
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            return SDL_PIXELFORMAT_RGB565;
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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 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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        case 0x00000000:
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            /* FIXME: At this point we can't distinguish */
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            /* if this format is RGB24 or BGR24          */
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            return SDL_PIXELFORMAT_RGB24;
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        }
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   302
    case 32:
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        switch (Rmask) {
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   304
        case 0xFF000000:
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   305
            if (Amask == 0x000000FF) {
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   306
                return SDL_PIXELFORMAT_RGBA8888;
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   307
            }
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   308
            break;
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   309
        case 0x00FF0000:
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   310
            if (Amask == 0xFF000000) {
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   311
                return SDL_PIXELFORMAT_ARGB8888;
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   312
            } else {
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   313
                return SDL_PIXELFORMAT_RGB888;
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   314
            }
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   315
            break;
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   316
        case 0x0000FF00:
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   317
            if (Amask == 0x000000FF) {
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   318
                return SDL_PIXELFORMAT_BGRA8888;
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   319
            }
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   320
            break;
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   321
        case 0x000000FF:
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   322
            if (Amask == 0xFF000000) {
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   323
                return SDL_PIXELFORMAT_ABGR8888;
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   324
            } else {
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   325
                return SDL_PIXELFORMAT_BGR888;
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   326
            }
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   327
            break;
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   328
        case 0x3FF00000:
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   329
            return SDL_PIXELFORMAT_ARGB2101010;
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   330
        }
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   331
    }
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   332
    return SDL_PIXELFORMAT_UNKNOWN;
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   333
}
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   334
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   335
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   336
SDL_Palette *
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   337
SDL_AllocPalette(int ncolors)
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   338
{
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   339
    SDL_Palette *palette;
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   340
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   341
    palette = (SDL_Palette *) SDL_malloc(sizeof(*palette));
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   342
    if (!palette) {
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   343
        SDL_OutOfMemory();
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   344
        return NULL;
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   345
    }
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   346
    palette->colors =
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   347
        (SDL_Color *) SDL_malloc(ncolors * sizeof(*palette->colors));
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   348
    if (!palette->colors) {
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   349
        SDL_free(palette);
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   350
        return NULL;
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   351
    }
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   352
    palette->ncolors = ncolors;
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   353
    palette->watch = NULL;
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   354
    palette->refcount = 1;
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   355
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   356
    SDL_memset(palette->colors, 0xFF, ncolors * sizeof(*palette->colors));
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   357
slouken@1895
   358
    return palette;
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   359
}
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   360
slouken@1895
   361
int
slouken@1895
   362
SDL_AddPaletteWatch(SDL_Palette * palette, SDL_PaletteChangedFunc callback,
slouken@1895
   363
                    void *userdata)
slouken@1895
   364
{
slouken@1895
   365
    SDL_PaletteWatch *watch;
slouken@1895
   366
slouken@1895
   367
    if (!palette) {
slouken@1895
   368
        return -1;
slouken@1895
   369
    }
slouken@1895
   370
slouken@1895
   371
    watch = (SDL_PaletteWatch *) SDL_malloc(sizeof(*watch));
slouken@1895
   372
    if (!watch) {
slouken@1895
   373
        SDL_OutOfMemory();
slouken@1895
   374
        return -1;
slouken@1895
   375
    }
slouken@1895
   376
slouken@1895
   377
    watch->callback = callback;
slouken@1895
   378
    watch->userdata = userdata;
slouken@1895
   379
    watch->next = palette->watch;
slouken@1895
   380
    palette->watch = watch;
slouken@1895
   381
    ++palette->refcount;
slouken@1895
   382
    return 0;
slouken@1895
   383
}
slouken@1895
   384
slouken@1895
   385
void
slouken@1895
   386
SDL_DelPaletteWatch(SDL_Palette * palette, SDL_PaletteChangedFunc callback,
slouken@1895
   387
                    void *userdata)
slouken@1895
   388
{
slouken@1895
   389
    SDL_PaletteWatch *prev, *watch;
slouken@1895
   390
slouken@1895
   391
    if (!palette) {
slouken@1895
   392
        return;
slouken@1895
   393
    }
slouken@1895
   394
slouken@1895
   395
    for (prev = NULL, watch = palette->watch; watch;
slouken@1895
   396
         prev = watch, watch = watch->next) {
slouken@1895
   397
        if (watch->callback == callback && watch->userdata == userdata) {
slouken@1895
   398
            if (prev) {
slouken@1895
   399
                prev->next = watch->next;
slouken@1895
   400
            } else {
slouken@1895
   401
                palette->watch = watch->next;
slouken@1895
   402
            }
slouken@1895
   403
            SDL_free(watch);
slouken@1895
   404
            SDL_FreePalette(palette);
slouken@1895
   405
            return;
slouken@1895
   406
        }
slouken@1895
   407
    }
slouken@1895
   408
}
slouken@1895
   409
slouken@1895
   410
int
slouken@1895
   411
SDL_SetPaletteColors(SDL_Palette * palette, const SDL_Color * colors,
slouken@1895
   412
                     int firstcolor, int ncolors)
slouken@1895
   413
{
slouken@1895
   414
    SDL_PaletteWatch *watch;
slouken@1895
   415
    int status = 0;
slouken@1895
   416
slouken@1895
   417
    /* Verify the parameters */
slouken@1895
   418
    if (!palette) {
slouken@1895
   419
        return -1;
slouken@1895
   420
    }
slouken@1895
   421
    if (ncolors > (palette->ncolors - firstcolor)) {
slouken@1895
   422
        ncolors = (palette->ncolors - firstcolor);
slouken@1895
   423
        status = -1;
slouken@1895
   424
    }
slouken@1895
   425
slouken@1895
   426
    if (colors != (palette->colors + firstcolor)) {
slouken@1895
   427
        SDL_memcpy(palette->colors + firstcolor, colors,
slouken@1895
   428
                   ncolors * sizeof(*colors));
slouken@1895
   429
    }
slouken@1895
   430
slouken@1895
   431
    for (watch = palette->watch; watch; watch = watch->next) {
slouken@1895
   432
        if (watch->callback(watch->userdata, palette) < 0) {
slouken@1895
   433
            status = -1;
slouken@1895
   434
        }
slouken@1895
   435
    }
slouken@1895
   436
slouken@1895
   437
    return status;
slouken@1895
   438
}
slouken@1895
   439
slouken@1895
   440
void
slouken@1895
   441
SDL_FreePalette(SDL_Palette * palette)
slouken@1895
   442
{
slouken@1895
   443
    if (!palette) {
slouken@1895
   444
        return;
slouken@1895
   445
    }
slouken@1895
   446
    if (--palette->refcount > 0) {
slouken@1895
   447
        return;
slouken@1895
   448
    }
slouken@1895
   449
    if (palette->colors) {
slouken@1895
   450
        SDL_free(palette->colors);
slouken@1895
   451
    }
slouken@1895
   452
    SDL_free(palette);
slouken@1895
   453
}
slouken@1895
   454
slouken@0
   455
/*
slouken@0
   456
 * Allocate a pixel format structure and fill it according to the given info.
slouken@0
   457
 */
slouken@1895
   458
SDL_PixelFormat *
slouken@1895
   459
SDL_AllocFormat(int bpp,
slouken@1895
   460
                Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
slouken@0
   461
{
slouken@1895
   462
    SDL_PixelFormat *format;
slouken@0
   463
slouken@1895
   464
    /* Allocate an empty pixel format structure */
slouken@2967
   465
    format = SDL_malloc(sizeof(*format));
slouken@1895
   466
    if (format == NULL) {
slouken@1895
   467
        SDL_OutOfMemory();
slouken@1895
   468
        return (NULL);
slouken@1895
   469
    }
slouken@0
   470
slouken@1895
   471
    /* Set up the format */
slouken@2967
   472
    return SDL_InitFormat(format, bpp, Rmask, Gmask, Bmask, Amask);
slouken@2967
   473
}
slouken@2967
   474
slouken@2967
   475
SDL_PixelFormat *
slouken@2990
   476
SDL_InitFormat(SDL_PixelFormat * format, int bpp, Uint32 Rmask, Uint32 Gmask,
slouken@2990
   477
               Uint32 Bmask, Uint32 Amask)
slouken@2967
   478
{
slouken@2967
   479
    Uint32 mask;
slouken@2967
   480
slouken@2967
   481
    /* Set up the format */
slouken@2967
   482
    SDL_zerop(format);
slouken@1895
   483
    format->BitsPerPixel = bpp;
slouken@1895
   484
    format->BytesPerPixel = (bpp + 7) / 8;
slouken@1895
   485
    if (Rmask || Bmask || Gmask) {      /* Packed pixels with custom mask */
slouken@1895
   486
        format->Rshift = 0;
slouken@1895
   487
        format->Rloss = 8;
slouken@1895
   488
        if (Rmask) {
slouken@1895
   489
            for (mask = Rmask; !(mask & 0x01); mask >>= 1)
slouken@1895
   490
                ++format->Rshift;
slouken@1895
   491
            for (; (mask & 0x01); mask >>= 1)
slouken@1895
   492
                --format->Rloss;
slouken@1895
   493
        }
slouken@1895
   494
        format->Gshift = 0;
slouken@1895
   495
        format->Gloss = 8;
slouken@1895
   496
        if (Gmask) {
slouken@1895
   497
            for (mask = Gmask; !(mask & 0x01); mask >>= 1)
slouken@1895
   498
                ++format->Gshift;
slouken@1895
   499
            for (; (mask & 0x01); mask >>= 1)
slouken@1895
   500
                --format->Gloss;
slouken@1895
   501
        }
slouken@1895
   502
        format->Bshift = 0;
slouken@1895
   503
        format->Bloss = 8;
slouken@1895
   504
        if (Bmask) {
slouken@1895
   505
            for (mask = Bmask; !(mask & 0x01); mask >>= 1)
slouken@1895
   506
                ++format->Bshift;
slouken@1895
   507
            for (; (mask & 0x01); mask >>= 1)
slouken@1895
   508
                --format->Bloss;
slouken@1895
   509
        }
slouken@1895
   510
        format->Ashift = 0;
slouken@1895
   511
        format->Aloss = 8;
slouken@1895
   512
        if (Amask) {
slouken@1895
   513
            for (mask = Amask; !(mask & 0x01); mask >>= 1)
slouken@1895
   514
                ++format->Ashift;
slouken@1895
   515
            for (; (mask & 0x01); mask >>= 1)
slouken@1895
   516
                --format->Aloss;
slouken@1895
   517
        }
slouken@1895
   518
        format->Rmask = Rmask;
slouken@1895
   519
        format->Gmask = Gmask;
slouken@1895
   520
        format->Bmask = Bmask;
slouken@1895
   521
        format->Amask = Amask;
slouken@1895
   522
    } else if (bpp > 8) {       /* Packed pixels with standard mask */
slouken@1895
   523
        /* R-G-B */
slouken@1895
   524
        if (bpp > 24)
slouken@1895
   525
            bpp = 24;
slouken@1895
   526
        format->Rloss = 8 - (bpp / 3);
slouken@1895
   527
        format->Gloss = 8 - (bpp / 3) - (bpp % 3);
slouken@1895
   528
        format->Bloss = 8 - (bpp / 3);
slouken@1895
   529
        format->Rshift = ((bpp / 3) + (bpp % 3)) + (bpp / 3);
slouken@1895
   530
        format->Gshift = (bpp / 3);
slouken@1895
   531
        format->Bshift = 0;
slouken@1895
   532
        format->Rmask = ((0xFF >> format->Rloss) << format->Rshift);
slouken@1895
   533
        format->Gmask = ((0xFF >> format->Gloss) << format->Gshift);
slouken@1895
   534
        format->Bmask = ((0xFF >> format->Bloss) << format->Bshift);
slouken@1895
   535
    } else {
slouken@1895
   536
        /* Palettized formats have no mask info */
slouken@1895
   537
        format->Rloss = 8;
slouken@1895
   538
        format->Gloss = 8;
slouken@1895
   539
        format->Bloss = 8;
slouken@1895
   540
        format->Aloss = 8;
slouken@1895
   541
        format->Rshift = 0;
slouken@1895
   542
        format->Gshift = 0;
slouken@1895
   543
        format->Bshift = 0;
slouken@1895
   544
        format->Ashift = 0;
slouken@1895
   545
        format->Rmask = 0;
slouken@1895
   546
        format->Gmask = 0;
slouken@1895
   547
        format->Bmask = 0;
slouken@1895
   548
        format->Amask = 0;
slouken@1895
   549
    }
slouken@1895
   550
    format->palette = NULL;
slouken@1057
   551
slouken@2967
   552
    return format;
slouken@0
   553
}
slouken@0
   554
slouken@0
   555
/*
slouken@0
   556
 * Change any previous mappings from/to the new surface format
slouken@0
   557
 */
slouken@1895
   558
void
slouken@1895
   559
SDL_FormatChanged(SDL_Surface * surface)
slouken@0
   560
{
slouken@1895
   561
    static int format_version = 0;
slouken@1895
   562
    ++format_version;
slouken@1895
   563
    if (format_version < 0) {   /* It wrapped... */
slouken@1895
   564
        format_version = 1;
slouken@1895
   565
    }
slouken@1895
   566
    surface->format_version = format_version;
slouken@1895
   567
    SDL_InvalidateMap(surface->map);
slouken@0
   568
}
slouken@1895
   569
slouken@0
   570
/*
slouken@0
   571
 * Free a previously allocated format structure
slouken@0
   572
 */
slouken@1895
   573
void
slouken@1895
   574
SDL_FreeFormat(SDL_PixelFormat * format)
slouken@0
   575
{
slouken@1895
   576
    if (!format) {
slouken@1895
   577
        return;
slouken@1895
   578
    }
slouken@1895
   579
    SDL_free(format);
slouken@0
   580
}
slouken@1895
   581
slouken@0
   582
/*
slouken@0
   583
 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
slouken@0
   584
 */
slouken@1895
   585
void
slouken@1895
   586
SDL_DitherColors(SDL_Color * colors, int bpp)
slouken@0
   587
{
slouken@1895
   588
    int i;
slouken@1895
   589
    if (bpp != 8)
slouken@1895
   590
        return;                 /* only 8bpp supported right now */
slouken@0
   591
slouken@1895
   592
    for (i = 0; i < 256; i++) {
slouken@1895
   593
        int r, g, b;
slouken@1895
   594
        /* map each bit field to the full [0, 255] interval,
slouken@1895
   595
           so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
slouken@1895
   596
        r = i & 0xe0;
slouken@1895
   597
        r |= r >> 3 | r >> 6;
slouken@1895
   598
        colors[i].r = r;
slouken@1895
   599
        g = (i << 3) & 0xe0;
slouken@1895
   600
        g |= g >> 3 | g >> 6;
slouken@1895
   601
        colors[i].g = g;
slouken@1895
   602
        b = i & 0x3;
slouken@1895
   603
        b |= b << 2;
slouken@1895
   604
        b |= b << 4;
slouken@1895
   605
        colors[i].b = b;
slouken@1895
   606
        colors[i].unused = SDL_ALPHA_OPAQUE;
slouken@1895
   607
    }
slouken@0
   608
}
slouken@1895
   609
slouken@0
   610
/* 
slouken@0
   611
 * Calculate the pad-aligned scanline width of a surface
slouken@0
   612
 */
slouken@1895
   613
int
slouken@1895
   614
SDL_CalculatePitch(SDL_Surface * surface)
slouken@0
   615
{
slouken@1895
   616
    int pitch;
slouken@0
   617
slouken@1895
   618
    /* Surface should be 4-byte aligned for speed */
slouken@1895
   619
    pitch = surface->w * surface->format->BytesPerPixel;
slouken@1895
   620
    switch (surface->format->BitsPerPixel) {
slouken@1895
   621
    case 1:
slouken@1895
   622
        pitch = (pitch + 7) / 8;
slouken@1895
   623
        break;
slouken@1895
   624
    case 4:
slouken@1895
   625
        pitch = (pitch + 1) / 2;
slouken@1895
   626
        break;
slouken@1895
   627
    default:
slouken@1895
   628
        break;
slouken@1895
   629
    }
slouken@1895
   630
    pitch = (pitch + 3) & ~3;   /* 4-byte aligning */
slouken@1895
   631
    return (pitch);
slouken@0
   632
}
slouken@1895
   633
slouken@0
   634
/*
slouken@0
   635
 * Match an RGB value to a particular palette index
slouken@0
   636
 */
slouken@1895
   637
Uint8
slouken@1895
   638
SDL_FindColor(SDL_Palette * pal, Uint8 r, Uint8 g, Uint8 b)
slouken@0
   639
{
slouken@1895
   640
    /* Do colorspace distance matching */
slouken@1895
   641
    unsigned int smallest;
slouken@1895
   642
    unsigned int distance;
slouken@1895
   643
    int rd, gd, bd;
slouken@1895
   644
    int i;
slouken@1895
   645
    Uint8 pixel = 0;
slouken@1895
   646
slouken@1895
   647
    smallest = ~0;
slouken@1895
   648
    for (i = 0; i < pal->ncolors; ++i) {
slouken@1895
   649
        rd = pal->colors[i].r - r;
slouken@1895
   650
        gd = pal->colors[i].g - g;
slouken@1895
   651
        bd = pal->colors[i].b - b;
slouken@1895
   652
        distance = (rd * rd) + (gd * gd) + (bd * bd);
slouken@1895
   653
        if (distance < smallest) {
slouken@1895
   654
            pixel = i;
slouken@1895
   655
            if (distance == 0) {        /* Perfect match! */
slouken@1895
   656
                break;
slouken@1895
   657
            }
slouken@1895
   658
            smallest = distance;
slouken@1895
   659
        }
slouken@1895
   660
    }
slouken@1895
   661
    return (pixel);
slouken@0
   662
}
slouken@0
   663
slouken@0
   664
/* Find the opaque pixel value corresponding to an RGB triple */
slouken@1895
   665
Uint32
slouken@2275
   666
SDL_MapRGB(const SDL_PixelFormat * format, Uint8 r, Uint8 g, Uint8 b)
slouken@0
   667
{
slouken@1895
   668
    if (format->palette == NULL) {
slouken@1895
   669
        return (r >> format->Rloss) << format->Rshift
slouken@1895
   670
            | (g >> format->Gloss) << format->Gshift
slouken@1895
   671
            | (b >> format->Bloss) << format->Bshift | format->Amask;
slouken@1895
   672
    } else {
slouken@1895
   673
        return SDL_FindColor(format->palette, r, g, b);
slouken@1895
   674
    }
slouken@0
   675
}
slouken@0
   676
slouken@0
   677
/* Find the pixel value corresponding to an RGBA quadruple */
slouken@1895
   678
Uint32
slouken@2275
   679
SDL_MapRGBA(const SDL_PixelFormat * format, Uint8 r, Uint8 g, Uint8 b,
slouken@2275
   680
            Uint8 a)
slouken@0
   681
{
slouken@1895
   682
    if (format->palette == NULL) {
slouken@1895
   683
        return (r >> format->Rloss) << format->Rshift
slouken@1895
   684
            | (g >> format->Gloss) << format->Gshift
slouken@1895
   685
            | (b >> format->Bloss) << format->Bshift
slouken@1895
   686
            | ((a >> format->Aloss) << format->Ashift & format->Amask);
slouken@1895
   687
    } else {
slouken@1895
   688
        return SDL_FindColor(format->palette, r, g, b);
slouken@1895
   689
    }
slouken@0
   690
}
slouken@0
   691
slouken@1895
   692
void
slouken@2275
   693
SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * format, Uint8 * r, Uint8 * g,
slouken@2275
   694
           Uint8 * b)
slouken@2275
   695
{
slouken@2275
   696
    if (format->palette == NULL) {
slouken@2275
   697
        /*
slouken@2275
   698
         * This makes sure that the result is mapped to the
slouken@2275
   699
         * interval [0..255], and the maximum value for each
slouken@2275
   700
         * component is 255. This is important to make sure
slouken@2275
   701
         * that white is indeed reported as (255, 255, 255).
slouken@2275
   702
         * This only works for RGB bit fields at least 4 bit
slouken@2275
   703
         * wide, which is almost always the case.
slouken@2275
   704
         */
slouken@2275
   705
        unsigned v;
slouken@2275
   706
        v = (pixel & format->Rmask) >> format->Rshift;
slouken@2275
   707
        *r = (v << format->Rloss) + (v >> (8 - (format->Rloss << 1)));
slouken@2275
   708
        v = (pixel & format->Gmask) >> format->Gshift;
slouken@2275
   709
        *g = (v << format->Gloss) + (v >> (8 - (format->Gloss << 1)));
slouken@2275
   710
        v = (pixel & format->Bmask) >> format->Bshift;
slouken@2275
   711
        *b = (v << format->Bloss) + (v >> (8 - (format->Bloss << 1)));
slouken@2275
   712
    } else {
slouken@2275
   713
        *r = format->palette->colors[pixel].r;
slouken@2275
   714
        *g = format->palette->colors[pixel].g;
slouken@2275
   715
        *b = format->palette->colors[pixel].b;
slouken@2275
   716
    }
slouken@2275
   717
}
slouken@2275
   718
slouken@2275
   719
void
slouken@2275
   720
SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format,
slouken@1895
   721
            Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
slouken@0
   722
{
slouken@2275
   723
    if (format->palette == NULL) {
slouken@1895
   724
        /*
slouken@1895
   725
         * This makes sure that the result is mapped to the
slouken@1895
   726
         * interval [0..255], and the maximum value for each
slouken@1895
   727
         * component is 255. This is important to make sure
slouken@1895
   728
         * that white is indeed reported as (255, 255, 255),
slouken@1895
   729
         * and that opaque alpha is 255.
slouken@1895
   730
         * This only works for RGB bit fields at least 4 bit
slouken@1895
   731
         * wide, which is almost always the case.
slouken@1895
   732
         */
slouken@1895
   733
        unsigned v;
slouken@2275
   734
        v = (pixel & format->Rmask) >> format->Rshift;
slouken@2275
   735
        *r = (v << format->Rloss) + (v >> (8 - (format->Rloss << 1)));
slouken@2275
   736
        v = (pixel & format->Gmask) >> format->Gshift;
slouken@2275
   737
        *g = (v << format->Gloss) + (v >> (8 - (format->Gloss << 1)));
slouken@2275
   738
        v = (pixel & format->Bmask) >> format->Bshift;
slouken@2275
   739
        *b = (v << format->Bloss) + (v >> (8 - (format->Bloss << 1)));
slouken@2275
   740
        if (format->Amask) {
slouken@2275
   741
            v = (pixel & format->Amask) >> format->Ashift;
slouken@2275
   742
            *a = (v << format->Aloss) + (v >> (8 - (format->Aloss << 1)));
slouken@1895
   743
        } else {
slouken@1895
   744
            *a = SDL_ALPHA_OPAQUE;
slouken@1895
   745
        }
slouken@1895
   746
    } else {
slouken@2275
   747
        *r = format->palette->colors[pixel].r;
slouken@2275
   748
        *g = format->palette->colors[pixel].g;
slouken@2275
   749
        *b = format->palette->colors[pixel].b;
slouken@1895
   750
        *a = SDL_ALPHA_OPAQUE;
slouken@1895
   751
    }
slouken@0
   752
}
slouken@0
   753
slouken@0
   754
/* Apply gamma to a set of colors - this is easy. :) */
slouken@1895
   755
void
slouken@1895
   756
SDL_ApplyGamma(Uint16 * gamma, SDL_Color * colors, SDL_Color * output,
slouken@1895
   757
               int ncolors)
slouken@0
   758
{
slouken@1895
   759
    int i;
slouken@0
   760
slouken@1895
   761
    for (i = 0; i < ncolors; ++i) {
slouken@1895
   762
        output[i].r = gamma[0 * 256 + colors[i].r] >> 8;
slouken@1895
   763
        output[i].g = gamma[1 * 256 + colors[i].g] >> 8;
slouken@1895
   764
        output[i].b = gamma[2 * 256 + colors[i].b] >> 8;
slouken@1895
   765
    }
slouken@0
   766
}
slouken@0
   767
slouken@0
   768
/* Map from Palette to Palette */
slouken@1895
   769
static Uint8 *
slouken@1895
   770
Map1to1(SDL_Palette * src, SDL_Palette * dst, int *identical)
slouken@0
   771
{
slouken@1895
   772
    Uint8 *map;
slouken@1895
   773
    int i;
slouken@0
   774
slouken@1895
   775
    if (identical) {
slouken@1895
   776
        if (src->ncolors <= dst->ncolors) {
slouken@1895
   777
            /* If an identical palette, no need to map */
slouken@1895
   778
            if (src == dst
slouken@1895
   779
                ||
slouken@1895
   780
                (SDL_memcmp
slouken@1895
   781
                 (src->colors, dst->colors,
slouken@1895
   782
                  src->ncolors * sizeof(SDL_Color)) == 0)) {
slouken@1895
   783
                *identical = 1;
slouken@1895
   784
                return (NULL);
slouken@1895
   785
            }
slouken@1895
   786
        }
slouken@1895
   787
        *identical = 0;
slouken@1895
   788
    }
slouken@1895
   789
    map = (Uint8 *) SDL_malloc(src->ncolors);
slouken@1895
   790
    if (map == NULL) {
slouken@1895
   791
        SDL_OutOfMemory();
slouken@1895
   792
        return (NULL);
slouken@1895
   793
    }
slouken@1895
   794
    for (i = 0; i < src->ncolors; ++i) {
slouken@1895
   795
        map[i] = SDL_FindColor(dst,
slouken@1895
   796
                               src->colors[i].r, src->colors[i].g,
slouken@1895
   797
                               src->colors[i].b);
slouken@1895
   798
    }
slouken@1895
   799
    return (map);
slouken@0
   800
}
slouken@1895
   801
slouken@0
   802
/* Map from Palette to BitField */
slouken@1895
   803
static Uint8 *
slouken@2267
   804
Map1toN(SDL_PixelFormat * src, Uint8 Rmod, Uint8 Gmod, Uint8 Bmod, Uint8 Amod,
slouken@2267
   805
        SDL_PixelFormat * dst)
slouken@0
   806
{
slouken@1895
   807
    Uint8 *map;
slouken@1895
   808
    int i;
slouken@1895
   809
    int bpp;
slouken@1895
   810
    SDL_Palette *pal = src->palette;
slouken@0
   811
slouken@1895
   812
    bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
slouken@1895
   813
    map = (Uint8 *) SDL_malloc(pal->ncolors * bpp);
slouken@1895
   814
    if (map == NULL) {
slouken@1895
   815
        SDL_OutOfMemory();
slouken@1895
   816
        return (NULL);
slouken@1895
   817
    }
slouken@0
   818
slouken@1895
   819
    /* We memory copy to the pixel map so the endianness is preserved */
slouken@1895
   820
    for (i = 0; i < pal->ncolors; ++i) {
slouken@2257
   821
        Uint8 A = Amod;
slouken@2267
   822
        Uint8 R = (Uint8) ((pal->colors[i].r * Rmod) / 255);
slouken@2267
   823
        Uint8 G = (Uint8) ((pal->colors[i].g * Gmod) / 255);
slouken@2267
   824
        Uint8 B = (Uint8) ((pal->colors[i].b * Bmod) / 255);
slouken@2257
   825
        ASSEMBLE_RGBA(&map[i * bpp], dst->BytesPerPixel, dst, R, G, B, A);
slouken@1895
   826
    }
slouken@1895
   827
    return (map);
slouken@0
   828
}
slouken@1895
   829
slouken@0
   830
/* Map from BitField to Dithered-Palette to Palette */
slouken@1895
   831
static Uint8 *
slouken@1895
   832
MapNto1(SDL_PixelFormat * src, SDL_PixelFormat * dst, int *identical)
slouken@0
   833
{
slouken@1895
   834
    /* Generate a 256 color dither palette */
slouken@1895
   835
    SDL_Palette dithered;
slouken@1895
   836
    SDL_Color colors[256];
slouken@1895
   837
    SDL_Palette *pal = dst->palette;
slouken@0
   838
slouken@1895
   839
    dithered.ncolors = 256;
slouken@1895
   840
    SDL_DitherColors(colors, 8);
slouken@1895
   841
    dithered.colors = colors;
slouken@1895
   842
    return (Map1to1(&dithered, pal, identical));
slouken@0
   843
}
slouken@0
   844
slouken@1895
   845
SDL_BlitMap *
slouken@1895
   846
SDL_AllocBlitMap(void)
slouken@0
   847
{
slouken@1895
   848
    SDL_BlitMap *map;
slouken@0
   849
slouken@1895
   850
    /* Allocate the empty map */
slouken@1920
   851
    map = (SDL_BlitMap *) SDL_calloc(1, sizeof(*map));
slouken@1895
   852
    if (map == NULL) {
slouken@1895
   853
        SDL_OutOfMemory();
slouken@1895
   854
        return (NULL);
slouken@1895
   855
    }
slouken@2267
   856
    map->info.r = 0xFF;
slouken@2267
   857
    map->info.g = 0xFF;
slouken@2267
   858
    map->info.b = 0xFF;
slouken@2267
   859
    map->info.a = 0xFF;
slouken@0
   860
slouken@1895
   861
    /* It's ready to go */
slouken@1895
   862
    return (map);
slouken@0
   863
}
slouken@1895
   864
slouken@1895
   865
void
slouken@1895
   866
SDL_InvalidateMap(SDL_BlitMap * map)
slouken@0
   867
{
slouken@1895
   868
    if (!map) {
slouken@1895
   869
        return;
slouken@1895
   870
    }
slouken@1895
   871
    map->dst = NULL;
slouken@1895
   872
    map->format_version = (unsigned int) -1;
slouken@2267
   873
    if (map->info.table) {
slouken@2267
   874
        SDL_free(map->info.table);
slouken@2267
   875
        map->info.table = NULL;
slouken@1895
   876
    }
slouken@0
   877
}
slouken@2735
   878
slouken@1895
   879
int
slouken@1895
   880
SDL_MapSurface(SDL_Surface * src, SDL_Surface * dst)
slouken@0
   881
{
slouken@1895
   882
    SDL_PixelFormat *srcfmt;
slouken@1895
   883
    SDL_PixelFormat *dstfmt;
slouken@1895
   884
    SDL_BlitMap *map;
slouken@0
   885
slouken@1895
   886
    /* Clear out any previous mapping */
slouken@1895
   887
    map = src->map;
slouken@1895
   888
    if ((src->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
   889
        SDL_UnRLESurface(src, 1);
slouken@1895
   890
    }
slouken@1895
   891
    SDL_InvalidateMap(map);
slouken@0
   892
slouken@1895
   893
    /* Figure out what kind of mapping we're doing */
slouken@1895
   894
    map->identity = 0;
slouken@1895
   895
    srcfmt = src->format;
slouken@1895
   896
    dstfmt = dst->format;
slouken@1895
   897
    switch (srcfmt->BytesPerPixel) {
slouken@1895
   898
    case 1:
slouken@1895
   899
        switch (dstfmt->BytesPerPixel) {
slouken@1895
   900
        case 1:
slouken@1895
   901
            /* Palette --> Palette */
slouken@2267
   902
            map->info.table =
slouken@1895
   903
                Map1to1(srcfmt->palette, dstfmt->palette, &map->identity);
slouken@1895
   904
            if (!map->identity) {
slouken@2267
   905
                if (map->info.table == NULL) {
slouken@1895
   906
                    return (-1);
slouken@1895
   907
                }
slouken@1895
   908
            }
slouken@1895
   909
            if (srcfmt->BitsPerPixel != dstfmt->BitsPerPixel)
slouken@1895
   910
                map->identity = 0;
slouken@1895
   911
            break;
slouken@0
   912
slouken@1895
   913
        default:
slouken@1895
   914
            /* Palette --> BitField */
slouken@2267
   915
            map->info.table =
slouken@2267
   916
                Map1toN(srcfmt, src->map->info.r, src->map->info.g,
slouken@2267
   917
                        src->map->info.b, src->map->info.a, dstfmt);
slouken@2267
   918
            if (map->info.table == NULL) {
slouken@1895
   919
                return (-1);
slouken@1895
   920
            }
slouken@1895
   921
            break;
slouken@1895
   922
        }
slouken@1895
   923
        break;
slouken@1895
   924
    default:
slouken@1895
   925
        switch (dstfmt->BytesPerPixel) {
slouken@1895
   926
        case 1:
slouken@1895
   927
            /* BitField --> Palette */
slouken@2267
   928
            map->info.table = MapNto1(srcfmt, dstfmt, &map->identity);
slouken@1895
   929
            if (!map->identity) {
slouken@2267
   930
                if (map->info.table == NULL) {
slouken@1895
   931
                    return (-1);
slouken@1895
   932
                }
slouken@1895
   933
            }
slouken@1895
   934
            map->identity = 0;  /* Don't optimize to copy */
slouken@1895
   935
            break;
slouken@1895
   936
        default:
slouken@1895
   937
            /* BitField --> BitField */
slouken@1895
   938
            if (FORMAT_EQUAL(srcfmt, dstfmt))
slouken@1895
   939
                map->identity = 1;
slouken@1895
   940
            break;
slouken@1895
   941
        }
slouken@1895
   942
        break;
slouken@1895
   943
    }
slouken@0
   944
slouken@1895
   945
    map->dst = dst;
slouken@1895
   946
    map->format_version = dst->format_version;
slouken@0
   947
slouken@1895
   948
    /* Choose your blitters wisely */
slouken@1895
   949
    return (SDL_CalculateBlit(src));
slouken@0
   950
}
slouken@1895
   951
slouken@1895
   952
void
slouken@1895
   953
SDL_FreeBlitMap(SDL_BlitMap * map)
slouken@0
   954
{
slouken@1895
   955
    if (map) {
slouken@1895
   956
        SDL_InvalidateMap(map);
slouken@1895
   957
        SDL_free(map);
slouken@1895
   958
    }
slouken@0
   959
}
slouken@1895
   960
slouken@1895
   961
/* vi: set ts=4 sw=4 expandtab: */