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psppixelformat.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef PSP_PIXEL_FORMAT_H
#define PSP_PIXEL_FORMAT_H

#include "graphics/pixelformat.h"
#include "backends/platform/psp/trace.h"

/**
 *    Specialized PixelFormat class
 *  Supports only those formats which the PSP allows, including 4 bit palettes.
 *  Also provides accurate color conversion (needed for color masking)
 *  As well as swapping of red and blue channels (needed by HE games, for example)
 */
00038 struct PSPPixelFormat {
      enum Type {
            Type_None,
            Type_4444,
            Type_5551,
            Type_5650,
            Type_8888,
            Type_Palette_8bit,
            Type_Palette_4bit,
            Type_Unknown
      };

      Type format;
00051       uint32 bitsPerPixel;                            ///< Must match bpp of selected type
00052       bool swapRB;                                          ///< Swap red and blue values when reading and writing

      PSPPixelFormat() : format(Type_Unknown), bitsPerPixel(0), swapRB(false) {}
      void set(Type type, bool swap = false);
      static void convertFromScummvmPixelFormat(const Graphics::PixelFormat *pf,
              PSPPixelFormat::Type &bufferType,
              PSPPixelFormat::Type &paletteType,
              bool &swapRedBlue);
      static Graphics::PixelFormat convertToScummvmPixelFormat(PSPPixelFormat::Type type);
      uint32 convertTo32BitColor(uint32 color);

      inline uint32 rgbaToColor(uint32 r, uint32 g, uint32 b, uint32 a) {
            uint32 color;

            switch (format) {
            case Type_4444:
                  color = (((b >> 4) << 8) | ((g >> 4) << 4) | ((r >> 4) << 0) | ((a >> 4) << 12));
                  break;
            case Type_5551:
                  color = (((b >> 3) << 10) | ((g >> 3) << 5) | ((r >> 3) << 0) | ((a >> 7) << 15));
                  break;
            case Type_5650:
                  color = (((b >> 3) << 11) | ((g >> 2) << 5) | ((r >> 3) << 0));
                  break;
            case Type_8888:
                  color = (((b >> 0) << 16) | ((g >> 0) << 8) | ((r >> 0) << 0) | ((a >> 0) << 24));
                  break;
            default:
                  color = 0;
                  break;
            }
            return color;
      }

      inline void colorToRgba(uint32 color, uint32 &r, uint32 &g, uint32 &b, uint32 &a) {
            switch (format) {
            case Type_4444:
                  a = (color >> 12) & 0xF; // Interpolate to get true colors
                  b = (color >> 8)  & 0xF;
                  g = (color >> 4)  & 0xF;
                  r = (color >> 0)  & 0xF;
                  a = a << 4 | a;
                  b = b << 4 | b;
                  g = g << 4 | g;
                  r = r << 4 | r;
                  break;
            case Type_5551:
                  a = (color >> 15) ? 0xFF : 0;
                  b = (color >> 10) & 0x1F;
                  g = (color >> 5)  & 0x1F;
                  r = (color >> 0)  & 0x1F;
                  b = b << 3 | b >> 2;
                  g = g << 3 | g >> 2;
                  r = r << 3 | r >> 2;
                  break;
            case Type_5650:
                  a = 0xFF;
                  b = (color >> 11) & 0x1F;
                  g = (color >> 5)  & 0x3F;
                  r = (color >> 0)  & 0x1F;
                  b = b << 3 | b >> 2;
                  g = g << 2 | g >> 4;
                  r = r << 3 | r >> 2;
                  break;
            case Type_8888:
                  a = (color >> 24) & 0xFF;
                  b = (color >> 16) & 0xFF;
                  g = (color >> 8)  & 0xFF;
                  r = (color >> 0)  & 0xFF;
                  break;
            default:
                  a = b = g = r = 0;
                  break;
            }
      }

      inline uint32 setColorAlpha(uint32 color, byte alpha) {
            switch (format) {
            case Type_4444:
                  color = (color & 0x0FFF) | (((uint32)alpha >> 4) << 12);
                  break;
            case Type_5551:
                  color = (color & 0x7FFF) | (((uint32)alpha >> 7) << 15);
                  break;
            case Type_8888:
                  color = (color & 0x00FFFFFF) | ((uint32)alpha << 24);
                  break;
            case Type_5650:
            default:
                  break;
            }
            return color;
      }

      inline uint32 pixelsToBytes(uint32 pixels) {
            switch (bitsPerPixel) {
            case 4:
                  pixels >>= 1;
                  break;
            case 16:
                  pixels <<= 1;
                  break;
            case 32:
                  pixels <<= 2;
                  break;
            case 8:
                  break;
            default:
                  PSP_ERROR("Incorrect bitsPerPixel value[%u]. pixels[%u]\n", bitsPerPixel, pixels);
                  break;
            }
            return pixels;
      }

      inline uint16 swapRedBlue16(uint16 color) {
            uint16 output;

            switch (format) {
            case Type_4444:
                  output = (color & 0xf0f0) | ((color & 0x000f) << 8)  | ((color & 0x0f00) >> 8);
                  break;
            case Type_5551:
                  output = (color & 0x83e0) | ((color & 0x001f) << 10) | ((color & 0x7c00) >> 10);
                  break;
            case Type_5650:
                  output = (color & 0x07e0) | ((color & 0x001f) << 11) | ((color & 0xf800) >> 11);
                  break;
            default:
                  PSP_ERROR("invalid format[%u] for swapping\n", format);
                  output = 0;
                  break;
            }
            return output;
      }

      inline uint32 swapRedBlue32(uint32 color) {
            uint32 output;

            switch (format) {
            case Type_4444:
                  output = (color & 0xf0f0f0f0) |
                           ((color & 0x000f000f) << 8)  | ((color & 0x0f000f00) >> 8);
                  break;
            case Type_5551:
                  output = (color & 0x83e083e0) |
                           ((color & 0x001f001f) << 10) | ((color & 0x7c007c00) >> 10);
                  break;
            case Type_5650:
                  output = (color & 0x07e007e0) |
                           ((color & 0x001f001f) << 11) | ((color & 0xf800f800) >> 11);
                  break;
            case Type_8888:
                  output = (color & 0xff00ff00) |
                           ((color & 0x000000ff) << 16) | ((color & 0x00ff0000) >> 16);
                  break;
            default:
                  PSP_ERROR("invalid format[%u] for swapping\n", format);
                  output = 0;
                  break;
            }

            return output;
      }

      // Return whatever color we point at
      inline uint32 getColorValueAt(byte *pointer) {
            uint32 result;

            switch (bitsPerPixel) {
            case 4:     // We can't distinguish a 4 bit color with a pointer
            case 8:
                  result = *pointer;
                  break;
            case 16:
                  result = *(uint16 *)pointer;
                  break;
            case 32:
                  result = *(uint32 *)pointer;
                  break;
            default:
                  result = 0;
                  PSP_ERROR("Incorrect bitsPerPixel value[%u].\n", bitsPerPixel);
                  break;
            }
            return result;
      }
};

#endif /* PSP_PIXEL_FORMAT_H */

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