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// C_Converter
//class to convert images between different pixel formats.
#include "common.h"
#include "glimage.h"
#include "glconverter.h"
struct S_MaskShiftVal
{
int r;
int g;
int b;
int a;
};
struct S_MaskShift
{
S_MaskShiftVal stShift;
S_MaskShiftVal stMask;
S_MaskShiftVal stNumPos;
};
S_MaskShift TBL_LOOKUP[4][4] = {
{ //1 byte
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
},{ //2 bytes
{ {11,5,0,0}, {(31<<11),(63<<5),(31<<0), 0}, {5,6,5,0} }, //_BGR565
{ {0,5,11,0}, {(31<<0),(63<<5),(31<<11), 0}, {5,6,5,0} }, //_RGB565
{ {10,5,0,15}, {(31<<10),(31<<5),(31<<0), (1<<15)}, {5,5,5,1} }, //_BGR555
{ {0,5,10,15}, {(31<<0),(31<<5),(31<<10), (1<<15)}, {5,5,5,1} }, //_RGB555
},{ //3 bytes
{ {16,8,0,0}, {(255<<16),(255<<8),(255<<0), 0}, {8,8,8,0} }, //_BGR888
{ {0,8,16,0}, {(255<<0),(255<<8),(255<<16), 0}, {8,8,8,0} }, //_RGB888
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
{ {0,0,0,0}, {0,0,0,0}, {0,0,0,0} },
},{ //4 bytes
{ {16,8,0,24}, {(255<<16),(255<<8),(255<<0), (255<<24)}, {8,8,8,8} }, //_BGRA8888
{ {0,8,16,24}, {(255<<0),(255<<8),(255<<16), (255<<24)}, {8,8,8,8} }, //_RGBA8888
{ {16,8,0,24}, {(255<<16),(255<<8),(255<<0), 0}, {8,8,8,8} }, //_BGRx8888
{ {0,8,16,24}, {(255<<0),(255<<8),(255<<16), 0}, {8,8,8,8} }, //_RGBx8888
}
};
//constructor, sets m_iDstPixelFmt format
C_Converter::C_Converter(int iDstPixelFmt)
{
SetDstPixelFormat(iDstPixelFmt);
}
//set m_iDstPixelFmt format
void C_Converter::SetDstPixelFormat(int iDstPixelFmt)
{
m_iDstPixelFmt = iDstPixelFmt;
m_iDstBytes = iDstPixelFmt & 0x0f;
}
//convert an image to m_iDstPixelFmt format
void C_Converter::Convert(C_Image *src, C_Image **dst, int *o_iResult)
{
if(o_iResult) *o_iResult = 0;
if(!src || !dst) return;
bool bDeleteSrc = *dst == src;
src->GetInfo(&m_iWidth, &m_iHeight, &m_iSrcPixelFmt);
m_iSrcBytes = m_iSrcPixelFmt & 0x0f;
if(m_iSrcPixelFmt == m_iDstPixelFmt) {
*dst = src;
if(!bDeleteSrc) *dst = new C_Image(src); //copy src to dst
if(o_iResult) *o_iResult = 1;
return; //same format; but maybe not original
}
//remove if 16->8, true->8 become supported
if(m_iDstBytes == 1) return;
//no palette...
src->GetBufferMemory(&m_pSrcBuf.u8ptr, &m_pSrcPalBuf);
if((m_iSrcBytes == 1) && !m_pSrcPalBuf) return;
*dst = new C_Image(m_iWidth, m_iHeight, m_iDstPixelFmt);
(*dst)->GetBufferMemory(&m_pDstBuf.u8ptr, NULL);
src->GetLineSizeInfo(NULL, NULL, &m_iSrcAlign);
(*dst)->GetLineSizeInfo(NULL, NULL, &m_iDstAlign);
if(m_iDstBytes == 4) (*dst)->FillWithAbsoluteColor(NULL, 0);
//the above clears the unused byte in 32 bit format.
// makes sense when you use colorkey
if(m_iSrcBytes == 1) _8torgb();
else _rgbtorgb();
if(bDeleteSrc) delete src;
if(o_iResult) *o_iResult = 1;
}
//convert a color in _RGBA8888 format to m_iDstPixelFmt format
uint32_t C_Converter::GetAbsoluteColor(S_Color *pColor)
{
uint32_t iColor = 0;
if(m_iDstBytes == 1) return 0;
if(m_iDstPixelFmt == _RGB888) { //same format?
memcpy(&iColor, pColor, 3);
return iColor;
}
if(m_iDstPixelFmt == _RGBA8888) { //same format?
memcpy(&iColor, pColor, 4);
return iColor;
}
m_iWidth = m_iHeight = 1;
m_iSrcPixelFmt = _RGBA8888;
m_pSrcBuf.u8ptr = (uint8_t *)pColor;
m_iSrcBytes = m_iSrcPixelFmt & 0x0f;
m_pDstBuf.u32ptr = &iColor;
m_iSrcAlign = m_iDstAlign = 0;
_rgbtorgb();
return iColor;
}
//convert a color in m_iDstPixelFmt format to _RGBA8888 format
void C_Converter::GetColor(uint32_t iColor, S_Color *o_pColor)
{
m_iSrcPixelFmt = m_iDstPixelFmt; //hack to get srcformat from constructor
m_iSrcBytes = m_iSrcPixelFmt & 0x0f;
SetDstPixelFormat(_RGBA8888);
if(m_iSrcBytes == 1) return;
o_pColor->a = 0;
if(m_iSrcPixelFmt == _RGB888) { //same format?
memcpy(o_pColor, &iColor, 3);
return;
}
if(m_iSrcPixelFmt == _RGBA8888) { //same format?
memcpy(o_pColor, &iColor, 4);
return;
}
m_iWidth = m_iHeight = 1;
m_iSrcAlign = m_iDstAlign = 0;
m_pSrcBuf.u32ptr = &iColor;
m_pDstBuf.u8ptr = (uint8_t *)o_pColor;
_rgbtorgb();
}
//rgb24->bgr24,rgba32,bgra32,rgb16,bgr16,rgb15,bgr15
//rgba32->bgra32,rgb24,bgr24,rgb16,bgr16,rgb15,bgr15
//rgb16->rgb24,bgr24,rgba32,bgra32,bgr16,rgb15,bgr15
//rgb15->rgb24,bgr24,rgba32,bgra32,rgb16,bgr16,bgr15
//bgr24->rgb24,rgba32,bgra32,rgb16,bgr16,rgb15,bgr15
//bgra32->rgba32,rgb24,bgr24,rgb16,bgr16,rgb15,bgr15
//bgr16->rgb24,bgr24,rgba32,bgra32,rgb16,rgb15,bgr15
//bgr15->rgb24,bgr24,rgba32,bgra32,rgb16,bgr16,rgb15
void C_Converter::_rgbtorgb()
{
S_MaskShiftVal *pstSrcShift = &TBL_LOOKUP[m_iSrcBytes-1][m_iSrcPixelFmt >> 4].stShift;
S_MaskShiftVal *pstDstShift = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stShift;
S_MaskShiftVal *pstSrcMask = &TBL_LOOKUP[m_iSrcBytes-1][m_iSrcPixelFmt >> 4].stMask;
S_MaskShiftVal *pstDstMask = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stMask;
S_MaskShiftVal *pstSrcNumPos = &TBL_LOOKUP[m_iSrcBytes-1][m_iSrcPixelFmt >> 4].stNumPos;
S_MaskShiftVal *pstDstNumPos = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stNumPos;
int iShiftRightR = (pstSrcShift->r - pstDstShift->r) - (pstDstNumPos->r - pstSrcNumPos->r);
int iShiftRightG = (pstSrcShift->g - pstDstShift->g) - (pstDstNumPos->g - pstSrcNumPos->g);
int iShiftRightB = (pstSrcShift->b - pstDstShift->b) - (pstDstNumPos->b - pstSrcNumPos->b);
int iShiftRightA = (pstSrcShift->a - pstDstShift->a) - (pstDstNumPos->a - pstSrcNumPos->a);
uint32_t iSrcCol, iDstCol, iDstColR, iDstColG, iDstColB, iDstColA;
for(int y=0; y<m_iHeight; y++) {
for(int x=0; x<m_iWidth; x++) {
memcpy(&iSrcCol, m_pSrcBuf.u8ptr, m_iSrcBytes);
iDstColR = iShiftRightR>=0
? (iSrcCol >> iShiftRightR) & pstDstMask->r
: (iSrcCol << -iShiftRightR) & pstDstMask->r;
iDstColG = iShiftRightG>=0
? (iSrcCol >> iShiftRightG) & pstDstMask->g
: (iSrcCol << -iShiftRightG) & pstDstMask->g;
iDstColB = iShiftRightB>=0
? (iSrcCol >> iShiftRightB) & pstDstMask->b
: (iSrcCol << -iShiftRightB) & pstDstMask->b;
iDstCol = iDstColR | iDstColG | iDstColB;
if(pstSrcMask->a == 0) { //no alpha source
/*!*/if(iDstCol == 0) iDstColA = 0; //set transparancy
/*!*/else iDstColA = 0xffffffff & pstDstMask->a;
} else {
iDstColA = iShiftRightA>=0
? (iSrcCol >> iShiftRightA) & pstDstMask->a
: (iSrcCol << -iShiftRightA) & pstDstMask->a;
}
iDstCol |= iDstColA;
memcpy(m_pDstBuf.u32ptr, &iDstCol, m_iDstBytes);
//m_pDstBuf.u32ptr[0] = iDstCol;
m_pSrcBuf.u8ptr += (int)m_iSrcBytes;
m_pDstBuf.u8ptr += (int)m_iDstBytes;
}
m_pDstBuf.u8ptr += m_iDstAlign;
m_pSrcBuf.u8ptr += m_iSrcAlign;
}
}
//8pal->rgb24,bgr24,rgba32,bgra32,rgb16,bgr16,rgb15,bgr15
void C_Converter::_8torgb()
{
S_MaskShiftVal *pstDstShift = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stShift;
S_MaskShiftVal *pstDstMask = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stMask;
S_MaskShiftVal *pstDstNumPos = &TBL_LOOKUP[m_iDstBytes-1][m_iDstPixelFmt >> 4].stNumPos;
int iShiftRightR = -pstDstShift->r - (pstDstNumPos->r - 8);
int iShiftRightG = -pstDstShift->g - (pstDstNumPos->g - 8);
int iShiftRightB = -pstDstShift->b - (pstDstNumPos->b - 8);
int iShiftRightA = -pstDstShift->a - (pstDstNumPos->a - 8);
uint32_t iDstCol, iDstColR, iDstColG, iDstColB, iDstColA, iIdx;
for(int y=0; y<m_iHeight; y++) {
for(int x=0; x<m_iWidth; x++) {
iIdx = *m_pSrcBuf.u8ptr++;
iIdx <<= 2; //get to start in palette
iDstColR = iShiftRightR>=0
? (m_pSrcPalBuf[iIdx+0] >> iShiftRightR) & pstDstMask->r
: (m_pSrcPalBuf[iIdx+0] << -iShiftRightR) & pstDstMask->r;
iDstColG = iShiftRightG>=0
? (m_pSrcPalBuf[iIdx+1] >> iShiftRightG) & pstDstMask->g
: (m_pSrcPalBuf[iIdx+1] << -iShiftRightG) & pstDstMask->g;
iDstColB = iShiftRightB>=0
? (m_pSrcPalBuf[iIdx+2] >> iShiftRightB) & pstDstMask->b
: (m_pSrcPalBuf[iIdx+2] << -iShiftRightB) & pstDstMask->b;
iDstCol = iDstColR | iDstColG | iDstColB;
//if(iDstCol == 0) iDstColA = 255; //set transparancy
iDstColA = iShiftRightA>=0
? (m_pSrcPalBuf[iIdx+3] >> iShiftRightA) & pstDstMask->a
: (m_pSrcPalBuf[iIdx+3] << -iShiftRightA) & pstDstMask->a;
iDstCol |= iDstColA;
memcpy(m_pDstBuf.u32ptr, &iDstCol, m_iDstBytes);
//m_pDstBuf.u32ptr[0] = iDstCol;
m_pDstBuf.u8ptr += (int)m_iDstBytes;
}
m_pDstBuf.u8ptr += m_iDstAlign;
m_pSrcBuf.u8ptr += m_iSrcAlign;
}
}
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