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More work in sceJpegDecodeMJpegYCbCr.

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This commit is contained in:
shenweip 2013-10-05 01:04:41 +08:00
parent b1f81999fa
commit a7f7d64f31
1 changed files with 53 additions and 1 deletions
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54
Core/HLE/sceJpeg.cpp
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@ -208,6 +208,57 @@ int getWidthHeight(int width, int height)
return (width << 16) | height;
}
u32 convertRGBToYCbCr(u32 rgb) {
//see http://en.wikipedia.org/wiki/Yuv#Y.27UV444_to_RGB888_conversion for more information.
u8 r = (rgb >> 16) & 0xFF;
u8 g = (rgb >> 8) & 0xFF;
u8 b = (rgb >> 0) & 0xFF;
int y = 0.299f * r + 0.587f * g + 0.114f * b + 0;
int cb = -0.169f * r - 0.331f * g + 0.499f * b + 128.0f;
int cr = 0.499f * r - 0.418f * g - 0.0813f * b + 128.0f;
// check yCbCr value
if ( y > 0xFF) y = 0xFF; if ( y < 0) y = 0;
if (cb > 0xFF) cb = 0xFF; if (cb < 0) cb = 0;
if (cr > 0xFF) cr = 0xFF; if (cr < 0) cr = 0;
return (y << 16) | (cb << 8) | cr;
}
int __JpegDecodeMJpegYCbCr(const void *data, u32 bufferOutputAddr, int width, int height) {
u24 *imageBuffer = (u24*)data;
int sizeY = width * height;
int sizeCb = sizeY >> 2;
u8 *Y = (u8*)Memory::GetPointer(bufferOutputAddr);
u8 *Cb = Y + sizeY;
u8 *Cr = Cb + sizeCb;
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; x += 4) {
u32 abgr0 = imageBuffer[x + 0];
u32 abgr1 = imageBuffer[x + 1];
u32 abgr2 = imageBuffer[x + 2];
u32 abgr3 = imageBuffer[x + 3];
u32 yCbCr0 = convertRGBToYCbCr(abgr0);
u32 yCbCr1 = convertRGBToYCbCr(abgr1);
u32 yCbCr2 = convertRGBToYCbCr(abgr2);
u32 yCbCr3 = convertRGBToYCbCr(abgr3);
Y[x + 0] = (yCbCr0 >> 16) & 0xFF;
Y[x + 1] = (yCbCr1 >> 16) & 0xFF;
Y[x + 2] = (yCbCr2 >> 16) & 0xFF;
Y[x + 3] = (yCbCr3 >> 16) & 0xFF;
*Cb++ = (yCbCr0 >> 8) & 0xFF;
*Cr++ = yCbCr0 & 0xFF;
}
imageBuffer += width;
Y += width ;
}
return (width << 16) | height;
}
int sceJpegDecodeMJpegYCbCr(u32 jpegAddr, int jpegSize, u32 yCbCrAddr, int yCbCrSize, int dhtMode)
{
ERROR_LOG_REPORT(ME, "sceJpegDecodeMJpegYCbCr(%i, %i, %i, %i, %i)", jpegAddr, jpegSize, yCbCrAddr, yCbCrSize, dhtMode);
@ -229,7 +280,8 @@ int sceJpegDecodeMJpegYCbCr(u32 jpegAddr, int jpegSize, u32 yCbCrAddr, int yCbCr
}
if (jpegBuf == NULL)
return getWidthHeight(0, 0);
if (actual_components == 3)
__JpegDecodeMJpegYCbCr(jpegBuf, yCbCrAddr, width, height);
// TODO: There's more...
return getWidthHeight(width, height);