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/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/backends/platform/psp/osys_psp.cpp $
* $Id: osys_psp.cpp 46126 2009-11-24 14:18:46Z fingolfin $
*
*/
#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)
*/
struct PSPPixelFormat {
enum Type {
Type_None,
Type_4444,
Type_5551,
Type_5650,
Type_8888,
Type_Palette_8bit,
Type_Palette_4bit,
Type_Unknown
};
Type format;
uint32 bitsPerPixel; ///< Must match bpp of selected type
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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