?? libmng_pixels.c
字號:
(BC) = (mng_uint16)((S * (mng_uint32)(BT) + \
T * (mng_uint32)(BB) + (mng_uint32)32767) >> 16); }
/* ************************************************************************** */
/* note a good optimizing compiler will optimize this */
#define DIV255B8(x) (mng_uint8)(((x) + 127) / 255)
#define DIV255B16(x) (mng_uint16)(((x) + 32767) / 65535)
/* ************************************************************************** */
/* * * */
/* * Progressive display check - checks to see if progressive display is * */
/* * in order & indicates so * */
/* * * */
/* * The routine is called after a call to one of the display_xxx routines * */
/* * if appropriate * */
/* * * */
/* * The refresh is warrented in the read_chunk routine (mng_read.c) * */
/* * and only during read&display processing, since there's not much point * */
/* * doing it from memory! * */
/* * * */
/* ************************************************************************** */
mng_retcode mng_display_progressive_check (mng_datap pData)
{
if ((pData->bDoProgressive) && /* need progressive display? */
((pData->eImagetype != mng_it_mng) || (pData->iDataheight > 300)) &&
(pData->iDestb - pData->iDestt > 50) && (!pData->pCurraniobj))
{
mng_int32 iC = pData->iRow + pData->iDestt - pData->iSourcet;
if (iC % 20 == 0) /* every 20th line */
pData->bNeedrefresh = MNG_TRUE;
}
return MNG_NOERROR;
}
/* ************************************************************************** */
/* * * */
/* * Display routines - convert rowdata (which is already color-corrected) * */
/* * to the output canvas, respecting the opacity information * */
/* * * */
/* ************************************************************************** */
MNG_LOCAL void check_update_region (mng_datap pData)
{ /* determine actual canvas row */
mng_int32 iRow = pData->iRow + pData->iDestt - pData->iSourcet;
/* check for change in update-region */
if ((pData->iDestl < (mng_int32)pData->iUpdateleft) || (pData->iUpdateright == 0))
pData->iUpdateleft = pData->iDestl;
if (pData->iDestr > (mng_int32)pData->iUpdateright)
pData->iUpdateright = pData->iDestr;
if ((iRow < (mng_int32)pData->iUpdatetop) || (pData->iUpdatebottom == 0))
pData->iUpdatetop = iRow;
if (iRow+1 > (mng_int32)pData->iUpdatebottom)
pData->iUpdatebottom = iRow+1;
return;
}
/* ************************************************************************** */
#ifndef MNG_SKIPCANVAS_RGB8
mng_retcode mng_display_rgb8 (mng_datap pData)
{
mng_uint8p pScanline;
mng_uint8p pDataline;
mng_int32 iX;
#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 iA16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
mng_uint16 iFGr16, iFGg16, iFGb16;
mng_uint16 iBGr16, iBGg16, iBGb16;
#else
mng_uint16 iFGg16;
mng_uint16 iBGg16;
#endif
#endif
mng_uint8 iA8;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8, MNG_LC_START)
#endif
/* viewable row ? */
if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
{ /* address destination row */
pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
pData->iRow + pData->iDestt -
pData->iSourcet);
/* adjust destination row starting-point */
pScanline = pScanline + (pData->iCol * 3) + (pData->iDestl * 3);
pDataline = pData->pRGBArow; /* address source row */
#ifndef MNG_NO_16BIT_SUPPORT
if (pData->bIsRGBA16) /* adjust source row starting-point */
pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
else
#endif
pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);
if (pData->bIsOpaque) /* forget about transparency ? */
{
#ifndef MNG_NO_16BIT_SUPPORT
if (pData->bIsRGBA16) /* 16-bit input row ? */
{
for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
{ /* scale down by dropping the LSB */
*pScanline = *pDataline;
*(pScanline+1) = *(pDataline+2);
*(pScanline+2) = *(pDataline+4);
pScanline += (pData->iColinc * 3);
pDataline += 8;
}
}
else
#endif
{
for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
{ /* copy the values */
*pScanline = *pDataline;
*(pScanline+1) = *(pDataline+1);
*(pScanline+2) = *(pDataline+2);
pScanline += (pData->iColinc * 3);
pDataline += 4;
}
}
}
else
{
#ifndef MNG_NO_16BIT_SUPPORT
if (pData->bIsRGBA16) /* 16-bit input row ? */
{
for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
{
iA16 = mng_get_uint16 (pDataline+6);
if (iA16) /* any opacity at all ? */
{
if (iA16 == 0xFFFF) /* fully opaque ? */
{ /* scale down by dropping the LSB */
*pScanline = *pDataline;
*(pScanline+1) = *(pDataline+2);
*(pScanline+2) = *(pDataline+4);
}
else
{ /* get the proper values */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
int i;
for (i=2; i >= 0; i--)
{
iFGg16 = mng_get_uint16 (pDataline+i+i);
/* scale background up */
iBGg16 = (mng_uint16)(*(pScanline+i));
iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
/* now compose */
MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16)
/* and return the composed values */
*(pScanline+i) = (mng_uint8)(iFGg16 >> 8);
}
#else
iFGr16 = mng_get_uint16 (pDataline );
iFGg16 = mng_get_uint16 (pDataline+2);
iFGb16 = mng_get_uint16 (pDataline+4);
/* scale background up */
iBGr16 = (mng_uint16)(*pScanline );
iBGg16 = (mng_uint16)(*(pScanline+1));
iBGb16 = (mng_uint16)(*(pScanline+2));
iBGr16 = (mng_uint16)((mng_uint32)iBGr16 << 8) | iBGr16;
iBGg16 = (mng_uint16)((mng_uint32)iBGg16 << 8) | iBGg16;
iBGb16 = (mng_uint16)((mng_uint32)iBGb16 << 8) | iBGb16;
/* now compose */
MNG_COMPOSE16(iFGr16, iFGr16, iA16, iBGr16)
MNG_COMPOSE16(iFGg16, iFGg16, iA16, iBGg16)
MNG_COMPOSE16(iFGb16, iFGb16, iA16, iBGb16)
/* and return the composed values */
*pScanline = (mng_uint8)(iFGr16 >> 8);
*(pScanline+1) = (mng_uint8)(iFGg16 >> 8);
*(pScanline+2) = (mng_uint8)(iFGb16 >> 8);
#endif
}
}
pScanline += (pData->iColinc * 3);
pDataline += 8;
}
}
else
#endif
{
for (iX = pData->iSourcel + pData->iCol; iX < pData->iSourcer; iX += pData->iColinc)
{
iA8 = *(pDataline+3); /* get alpha value */
if (iA8) /* any opacity at all ? */
{
if (iA8 == 0xFF) /* fully opaque ? */
{ /* then simply copy the values */
*pScanline = *pDataline;
*(pScanline+1) = *(pDataline+1);
*(pScanline+2) = *(pDataline+2);
}
else
{ /* do alpha composing */
#ifdef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
int i;
for (i=2; i >= 0; i--)
{
MNG_COMPOSE8 (*(pScanline+i), *(pDataline+i), iA8, *(pScanline+i))
}
#else
MNG_COMPOSE8 (*pScanline, *pDataline, iA8, *pScanline )
MNG_COMPOSE8 (*(pScanline+1), *(pDataline+1), iA8, *(pScanline+1))
MNG_COMPOSE8 (*(pScanline+2), *(pDataline+2), iA8, *(pScanline+2))
#endif
}
}
pScanline += (pData->iColinc * 3);
pDataline += 4;
}
}
}
}
check_update_region (pData);
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_DISPLAY_RGB8, MNG_LC_END)
#endif
return MNG_NOERROR;
}
#endif /* MNG_SKIPCANVAS_RGB8 */
/* ************************************************************************** */
#ifndef MNG_SKIPCANVAS_RGBA8
mng_retcode mng_display_rgba8 (mng_datap pData)
{
mng_uint8p pScanline;
mng_uint8p pDataline;
mng_int32 iX;
mng_uint8 iFGa8, iBGa8, iCa8;
#ifndef MNG_NO_16BIT_SUPPORT
mng_uint16 iFGa16, iBGa16, iCa16;
#ifndef MNG_OPTIMIZE_FOOTPRINT_COMPOSE
mng_uint16 iFGr16, iFGg16, iFGb16;
#else
mng_uint16 iFGg16;
#endif
mng_uint16 iBGr16, iBGg16, iBGb16;
mng_uint16 iCr16, iCg16, iCb16;
#endif
mng_uint8 iCr8, iCg8, iCb8;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_DISPLAY_RGBA8, MNG_LC_START)
#endif
/* viewable row ? */
if ((pData->iRow >= pData->iSourcet) && (pData->iRow < pData->iSourceb))
{ /* address destination row */
pScanline = (mng_uint8p)pData->fGetcanvasline (((mng_handle)pData),
pData->iRow + pData->iDestt -
pData->iSourcet);
/* adjust destination row starting-point */
pScanline = pScanline + (pData->iCol << 2) + (pData->iDestl << 2);
pDataline = pData->pRGBArow; /* address source row */
#ifndef MNG_NO_16BIT_SUPPORT
if (pData->bIsRGBA16) /* adjust source row starting-point */
pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 3);
else
#endif
pDataline = pDataline + ((pData->iSourcel / pData->iColinc) << 2);
if (pData->bIsOpaque) /* forget about transparency ? */
{
#ifndef MNG_NO_16BIT_SUPPORT
if (pData->bIsRGBA16) /* 16-bit input row ? */
{
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