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Copy pathbmp.cpp
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399 lines (391 loc) · 14.3 KB
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#include "bmp.h"
uint32_t *bmp::decode(char *data, int32_t &width, int32_t &height)
{
char *orig=data;
if(io::readUInt16(data)!=0x4D42)
return 0;
fs_t size=io::readUInt32(data);
data+=4;
fs_t pixelDataPos=io::readUInt32(data);
fs_t headerSize=io::readUInt32(data);
width=io::readUInt32(data);
height=io::readUInt32(data);
bool upsideDown=height>0;
if(!upsideDown)
height*=-1;
uint16_t colorPlaneCount=io::readUInt16(data);
uint16_t bitsPerPixel=io::readUInt16(data);
uint32_t compressionMethod=io::readUInt32(data);
uint32_t imageSize=io::readUInt32(data);
int32_t horResInPixelsPerMeter=io::readUInt32(data);
int32_t verResInPixelsPerMeter=io::readUInt32(data);
uint32_t paletteColors=io::readUInt32(data);
data+=4;
uint32_t rowSize=(uint32_t)floor((double)(bitsPerPixel*width+31)/32)*4;
// If bitsPerPixel==16: actual masks; shift values stored in *Shift16.
uint32_t redShift=compressionMethod==BMP_COMPRESSION_BITFIELDS?(bitsPerPixel==16?io::readUInt32(data):((uint32_t)ceil((double)log2((double)io::readUInt32(data)))/8))-1:2; // Get bit offset out of this number
uint32_t greenShift=compressionMethod==BMP_COMPRESSION_BITFIELDS?(bitsPerPixel==16?io::readUInt32(data):((uint32_t)ceil((double)log2((double)io::readUInt32(data)))/8))-1:1;
uint32_t blueShift=compressionMethod==BMP_COMPRESSION_BITFIELDS?(bitsPerPixel==16?io::readUInt32(data):((uint32_t)ceil((double)log2((double)io::readUInt32(data)))/8))-1:0;
uint32_t redShift16,greenShift16,blueShift16;
uint8_t redMax16,greenMax16,blueMax16;
if(bitsPerPixel==16)
{
redShift16=(uint32_t)ceil((double)log2((double)redShift));
greenShift16=(uint32_t)ceil((double)log2((double)greenShift));
blueShift16=(uint32_t)ceil((double)log2((double)blueShift));
if(redShift16>greenShift16)
{
if(redShift16>blueShift16)
{
if(greenShift16>blueShift16)
{
// redShift16>greenShift16>blueShift16
redShift16=greenShift16;
greenShift16=blueShift16;
blueShift16=0;
}
else
{
// redShift16>blueShift16>greenShift16
redShift16=blueShift16;
blueShift16=greenShift16;
greenShift16=0;
}
}
else
{
// blueShift16>redShift16>greenShift16
blueShift16=redShift16;
redShift16=greenShift16;
greenShift16=0;
}
}
else if(blueShift16>greenShift16)
{
// blueShift16>greenShift16>redShift16
blueShift16=greenShift16;
greenShift16=redShift16;
redShift16=0;
}
else
{
if(redShift16>blueShift16)
{
// greenShift16>redShift16>blueShift16
greenShift16=redShift16;
redShift16=blueShift16;
blueShift16=0;
}
else
{
// greenShift16>blueShift16>redShift16
greenShift16=blueShift16;
blueShift16=redShift16;
redShift16=0;
}
}
redMax16=(uint32_t)redShift>>redShift16;
greenMax16=(uint32_t)greenShift>>greenShift16;
blueMax16=(uint32_t)blueShift>>blueShift16;
}
uint32_t *out=(uint32_t*)malloc(width*height*4);
uint32_t *colorTable=0;
if(bitsPerPixel<16)
{
if(paletteColors==0)
paletteColors=(uint32_t)pow(2.0,bitsPerPixel);
// Color table mandatory if bitsPerPixel<16
colorTable=(uint32_t*)malloc(4*paletteColors);
memcpy(colorTable,data,4*paletteColors);
}
data=orig+pixelDataPos;
if(compressionMethod==BMP_COMPRESSION_RGB||compressionMethod==BMP_COMPRESSION_BITFIELDS)
{
if(bitsPerPixel==1)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
out[(height-y-1)*width+x]=0xFF000000|colorTable[((uint8_t)data[(uint32_t)(y*rowSize+(uint32_t)floor((float)x/8))]&(1<<(7-(x%8))))>0];
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
out[y*width+x]=0xFF000000|colorTable[((uint8_t)data[(uint32_t)(y*rowSize+(uint32_t)floor((float)x/8))]&(1<<(7-(x%8))))>0];
}
}
}
}
else if(bitsPerPixel==4)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
out[(height-y-1)*width+x]=0xFF000000|colorTable[(((uint8_t)data[(uint32_t)(y*rowSize+(uint32_t)floor((float)x/2))]&(0xF<<(((x+1)%2)*4))))>>(((x+1)%2)*4)];
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
out[y*width+x]=0xFF000000|colorTable[(((uint8_t)data[(uint32_t)(y*rowSize+(uint32_t)floor((float)x/2))]&(0xF<<(((x+1)%2)*4))))>>(((x+1)%2)*4)];
}
}
}
}
else if(bitsPerPixel==8)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint8_t pixel=(uint8_t)data[y*rowSize+x];
out[(height-y-1)*width+x]=0xFF000000|colorTable[pixel];
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t pixel=(uint8_t)data[y*width+x];
out[y*width+x]=0xFF000000|colorTable[pixel];
}
}
}
}
else if(bitsPerPixel==16)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+2*x; // Byte at which this pixel starts
uint32_t pixel=(uint8_t)data[offset]|((uint32_t)((uint8_t)data[offset+1])<<8);
uint8_t r=(uint8_t)(((double)((pixel&redShift)>>redShift16)/redMax16)*255);
uint8_t g=(uint8_t)(((double)((pixel&greenShift)>>greenShift16)/greenMax16)*255);
uint8_t b=(uint8_t)(((double)((pixel&blueShift)>>blueShift16)/blueMax16)*255);
out[(height-y-1)*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+2*x; // Byte at which this pixel starts
uint32_t pixel=(uint8_t)data[offset]|((uint32_t)((uint8_t)data[offset+1])<<8);
uint8_t r=(uint8_t)(((double)((pixel&redShift)>>redShift16)/redMax16)*255);
uint8_t g=(uint8_t)(((double)((pixel&greenShift)>>greenShift16)/greenMax16)*255);
uint8_t b=(uint8_t)(((double)((pixel&blueShift)>>blueShift16)/blueMax16)*255);
out[y*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
}
else if(bitsPerPixel==24)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+3*x; // Byte at which this pixel starts
uint32_t b=(uint8_t)data[offset+blueShift];
uint32_t g=(uint8_t)data[offset+greenShift];
uint32_t r=(uint8_t)data[offset+redShift];
out[(height-y-1)*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+3*x; // Byte at which this pixel starts
uint32_t b=(uint8_t)data[offset+blueShift];
uint32_t g=(uint8_t)data[offset+greenShift];
uint32_t r=(uint8_t)data[offset+redShift];
out[y*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
}
else if(bitsPerPixel==32)
{
if(upsideDown)
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+4*x; // Byte at which this pixel starts
uint32_t b=(uint8_t)data[offset+blueShift];
uint32_t g=(uint8_t)data[offset+greenShift];
uint32_t r=(uint8_t)data[offset+redShift];
out[y*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
else
{
for(int32_t y=0;y<height;y++)
{
for(int32_t x=0;x<width;x++)
{
uint32_t offset=y*rowSize+4*x; // Byte at which this pixel starts
uint32_t b=(uint8_t)data[offset+blueShift];
uint32_t g=(uint8_t)data[offset+greenShift];
uint32_t r=(uint8_t)data[offset+redShift];
out[(height-y-1)*width+x]=0xFF000000|(r<<16)|(g<<8)|b;
}
}
}
}
free(colorTable);
return out;
}
else if(compressionMethod==BMP_COMPRESSION_RLE8)
{
// Change BMP_COMPRESSION_RLE4, too!
uint32_t y=upsideDown?height-1:0;
uint32_t x=0;
uint8_t nextByte;
while(true)
{
nextByte=(uint8_t)*(data++);
if(nextByte>0)
{
// Encoded mode
// First byte: number of pixels
// Second byte: indexed color
uint32_t color=0xFF000000|colorTable[(uint8_t)*(data++)];
for(uint8_t pos=0;pos<nextByte;pos++)
out[y*width+x++]=color;
}
else
{
uint8_t secondByte=(uint8_t)*(data++);
if(secondByte>0x2)
{
// Absolute mode
for(uint8_t pos=0;pos<secondByte;pos++)
out[y*width+(x++)]=0xFF000000|colorTable[(uint8_t)*(data++)];
data+=(data-orig)%2; // Run must be word-aligned.
}
else
{
// Special code
if(secondByte==0)
{
// End of line
if(upsideDown)
y--;
else
y++;
x=0;
}
else if(secondByte==1)
break; // End of bitmap
else // secondByte==2
{
// Delta
x+=(uint8_t)*(data++);
y+=(uint8_t)*(data++);
}
}
}
}
free(colorTable);
return out;
}
else if(compressionMethod==BMP_COMPRESSION_RLE4)
{
// Change BMP_COMPRESSION_RLE8, too!
uint32_t y=upsideDown?height-1:0;
uint32_t x=0;
uint8_t nextByte;
while(true)
{
nextByte=(uint8_t)*(data++);
if(nextByte>0)
{
// Encoded mode
// First byte: number of pixels
// Second byte: indexed colors (2)!
uint32_t secondByte=(uint8_t)*(data++);
uint32_t colorA=0xFF000000|colorTable[(secondByte&0xF0)>>4];
uint32_t colorB=0xFF000000|colorTable[secondByte&0xF];
for(uint8_t pos=0;pos<nextByte;pos++)
out[y*width+x++]=(pos%2)>0?colorB:colorA;
}
else
{
uint8_t secondByte=(uint8_t)*(data++);
if(secondByte>0x2)
{
// Absolute mode
uint8_t pixel;
bool second;
for(uint8_t pos=0;pos<secondByte;pos++)
{
if(!(second=(pos%2)>0))
pixel=(uint8_t)*(data++);
out[y*width+(x++)]=0xFF000000|colorTable[(second?(pixel&0xF):((pixel&0xF0)>>4))];
}
data+=(data-orig)%2; // Run must be word-aligned.
}
else
{
// Special code
if(secondByte==0)
{
// End of line
if(upsideDown)
y--;
else
y++;
x=0;
}
else if(secondByte==1)
break; // End of bitmap
else // secondByte==2
{
// Delta
x+=(uint8_t)*(data++);
y+=(uint8_t)*(data++);
}
}
}
}
free(colorTable);
return out;
}
free(colorTable);
return 0;
}
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