/**
* Creates the selection channel from a gray scale image.
* black = unselected
*/
bool CxImage::SelectionSet(CxImage &from)
{
if (!from.IsGrayScale() || head.biWidth != from.head.biWidth || head.biHeight != from.head.biHeight){
strcpy(info.szLastError,"CxImage::SelectionSet: wrong width or height, or image is not gray scale");
return false;
}
if (pSelection==NULL) pSelection = (uint8_t*)malloc(head.biWidth * head.biHeight);
uint8_t* src = from.info.pImage;
uint8_t* dst = pSelection;
if (src==NULL || dst==NULL){
strcpy(info.szLastError,"CxImage::SelectionSet: null pointer");
return false;
}
for (int32_t y=0; y<head.biHeight; y++){
memcpy(dst,src,head.biWidth);
dst += head.biWidth;
src += from.info.dwEffWidth;
}
SelectionRebuildBox();
return true;
}
bool CxImage::AlphaSet(CxImage &from)
{
if (!from.IsGrayScale() || head.biWidth != from.head.biWidth || head.biHeight != from.head.biHeight) return false;
if (pAlpha==NULL) pAlpha = (BYTE*)malloc(head.biWidth * head.biHeight);
BYTE* src = from.info.pImage;
BYTE* dst = pAlpha;
for (long y=0; y<head.biHeight; y++){
memcpy(dst,src,head.biWidth);
dst += head.biWidth;
src += from.info.dwEffWidth;
}
return true;
}
/**
* Creates the alpha channel from a gray scale image.
*/
bool CxImage::AlphaSet(CxImage &from)
{
if (!from.IsGrayScale() || head.biWidth != from.head.biWidth || head.biHeight != from.head.biHeight) return false;
if (pAlpha==NULL) pAlpha = (uint8_t*)malloc(head.biWidth * head.biHeight);
uint8_t* src = from.info.pImage;
uint8_t* dst = pAlpha;
if (src==NULL || dst==NULL) return false;
for (int32_t y=0; y<head.biHeight; y++){
memcpy(dst,src,head.biWidth);
dst += head.biWidth;
src += from.info.dwEffWidth;
}
return true;
}
/**
* Creates the alpha channel from a gray scale image.
*/
bool CxImage::AlphaSet(CxImage &from)
{
if (!from.IsGrayScale() || head.biWidth != from.head.biWidth || head.biHeight != from.head.biHeight) return false;
if (!bAlpha)
{
return false;
}
//if (pAlpha==NULL) pAlpha = (uint8_t*)malloc(head.biWidth * head.biHeight);
uint8_t* src = from.info.pImage;
//uint8_t* dst = pAlpha;
if (src==NULL) return false;
for (int32_t y=0; y<head.biHeight; y++){
for (int32_t x = 0; x < head.biWidth; x++){
RGBQUAD* pClr = &((RGBQUAD*)info.pImage)[x + y * info.dwEffWidth];
pClr->rgbReserved = *(src + x);
}
//memcpy(dst,src,head.biWidth);
//dst += head.biWidth;
src += from.info.dwEffWidth;
}
return true;
}
