diff options
Diffstat (limited to 'archive/hge/CxImage/ximalpha.cpp')
| -rw-r--r-- | archive/hge/CxImage/ximalpha.cpp | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/archive/hge/CxImage/ximalpha.cpp b/archive/hge/CxImage/ximalpha.cpp new file mode 100644 index 0000000..2932068 --- /dev/null +++ b/archive/hge/CxImage/ximalpha.cpp @@ -0,0 +1,367 @@ +// xImalpha.cpp : Alpha channel functions
+/* 07/08/2001 v1.00 - Davide Pizzolato - www.xdp.it
+ * CxImage version 7.0.0 31/Dec/2010
+ */
+
+#include "ximage.h"
+
+#if CXIMAGE_SUPPORT_ALPHA
+
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * \sa AlphaSetMax
+ */
+uint8_t CxImage::AlphaGetMax() const
+{
+ return info.nAlphaMax;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Sets global Alpha (opacity) value applied to the whole image,
+ * valid only for painting functions.
+ * \param nAlphaMax: can be from 0 to 255
+ */
+void CxImage::AlphaSetMax(uint8_t nAlphaMax)
+{
+ info.nAlphaMax=nAlphaMax;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Checks if the image has a valid alpha channel.
+ */
+bool CxImage::AlphaIsValid()
+{
+ return pAlpha!=0;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Enables the alpha palette, so the Draw() function changes its behavior.
+ */
+void CxImage::AlphaPaletteEnable(bool enable)
+{
+ info.bAlphaPaletteEnabled=enable;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * True if the alpha palette is enabled for painting.
+ */
+bool CxImage::AlphaPaletteIsEnabled()
+{
+ return info.bAlphaPaletteEnabled;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Sets the alpha channel to full transparent. AlphaSet(0) has the same effect
+ */
+void CxImage::AlphaClear()
+{
+ if (pAlpha) memset(pAlpha,0,head.biWidth * head.biHeight);
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Sets the alpha level for the whole image.
+ * \param level : from 0 (transparent) to 255 (opaque)
+ */
+void CxImage::AlphaSet(uint8_t level)
+{
+ if (pAlpha) memset(pAlpha,level,head.biWidth * head.biHeight);
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Allocates an empty (opaque) alpha channel.
+ */
+bool CxImage::AlphaCreate()
+{
+ if (pAlpha==NULL) {
+ pAlpha = (uint8_t*)malloc(head.biWidth * head.biHeight);
+ if (pAlpha) memset(pAlpha,255,head.biWidth * head.biHeight);
+ }
+ return (pAlpha!=0);
+}
+////////////////////////////////////////////////////////////////////////////////
+void CxImage::AlphaDelete()
+{
+ if (pAlpha) { free(pAlpha); pAlpha=0; }
+}
+////////////////////////////////////////////////////////////////////////////////
+void CxImage::AlphaInvert()
+{
+ if (pAlpha) {
+ uint8_t *iSrc=pAlpha;
+ int32_t n=head.biHeight*head.biWidth;
+ for(int32_t i=0; i < n; i++){
+ *iSrc=(uint8_t)~(*(iSrc));
+ iSrc++;
+ }
+ }
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Imports an existing alpa channel from another image with the same width and height.
+ */
+bool CxImage::AlphaCopy(CxImage &from)
+{
+ if (from.pAlpha == NULL || head.biWidth != from.head.biWidth || head.biHeight != from.head.biHeight) return false;
+ if (pAlpha==NULL) pAlpha = (uint8_t*)malloc(head.biWidth * head.biHeight);
+ if (pAlpha==NULL) return false;
+ memcpy(pAlpha,from.pAlpha,head.biWidth * head.biHeight);
+ info.nAlphaMax=from.info.nAlphaMax;
+ 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;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Sets the alpha level for a single pixel
+ */
+void CxImage::AlphaSet(const int32_t x,const int32_t y,const uint8_t level)
+{
+ if (pAlpha && IsInside(x,y)) pAlpha[x+y*head.biWidth]=level;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Gets the alpha level for a single pixel
+ */
+uint8_t CxImage::AlphaGet(const int32_t x,const int32_t y)
+{
+ if (pAlpha && IsInside(x,y)) return pAlpha[x+y*head.biWidth];
+ return 0;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Returns pointer to alpha data for pixel (x,y).
+ *
+ * \author ***bd*** 2.2004
+ */
+uint8_t* CxImage::AlphaGetPointer(const int32_t x,const int32_t y)
+{
+ if (pAlpha && IsInside(x,y)) return pAlpha+x+y*head.biWidth;
+ return 0;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Get alpha value without boundscheck (a bit faster). Pixel must be inside the image.
+ *
+ * \author ***bd*** 2.2004
+ */
+uint8_t CxImage::BlindAlphaGet(const int32_t x,const int32_t y)
+{
+#ifdef _DEBUG
+ if (!IsInside(x,y) || (pAlpha==0))
+ #if CXIMAGE_SUPPORT_EXCEPTION_HANDLING
+ throw 0;
+ #else
+ return 0;
+ #endif
+#endif
+ return pAlpha[x+y*head.biWidth];
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Resets the alpha palette
+ */
+void CxImage::AlphaPaletteClear()
+{
+ RGBQUAD c;
+ for(uint16_t ip=0; ip<head.biClrUsed;ip++){
+ c=GetPaletteColor((uint8_t)ip);
+ c.rgbReserved=0;
+ SetPaletteColor((uint8_t)ip,c);
+ }
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Checks if the image has a valid alpha palette.
+ */
+bool CxImage::AlphaPaletteIsValid()
+{
+ RGBQUAD c;
+ for(uint16_t ip=0; ip<head.biClrUsed;ip++){
+ c=GetPaletteColor((uint8_t)ip);
+ if (c.rgbReserved != 0) return true;
+ }
+ return false;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Blends the alpha channel and the alpha palette with the pixels. The result is a 24 bit image.
+ * The background color can be selected using SetTransColor().
+ */
+void CxImage::AlphaStrip()
+{
+ bool bAlphaPaletteIsValid = AlphaPaletteIsValid();
+ bool bAlphaIsValid = AlphaIsValid();
+ if (!(bAlphaIsValid || bAlphaPaletteIsValid)) return;
+ RGBQUAD c;
+ int32_t a, a1;
+ if (head.biBitCount==24){
+ for(int32_t y=0; y<head.biHeight; y++){
+ for(int32_t x=0; x<head.biWidth; x++){
+ c = BlindGetPixelColor(x,y);
+ if (bAlphaIsValid) a=(BlindAlphaGet(x,y)*info.nAlphaMax)/255; else a=info.nAlphaMax;
+ a1 = 256-a;
+ c.rgbBlue = (uint8_t)((c.rgbBlue * a + a1 * info.nBkgndColor.rgbBlue)>>8);
+ c.rgbGreen = (uint8_t)((c.rgbGreen * a + a1 * info.nBkgndColor.rgbGreen)>>8);
+ c.rgbRed = (uint8_t)((c.rgbRed * a + a1 * info.nBkgndColor.rgbRed)>>8);
+ BlindSetPixelColor(x,y,c);
+ }
+ }
+ AlphaDelete();
+ } else {
+ CxImage tmp(head.biWidth,head.biHeight,24);
+ if (!tmp.IsValid()){
+ strcpy(info.szLastError,tmp.GetLastError());
+ return;
+ }
+
+ for(int32_t y=0; y<head.biHeight; y++){
+ for(int32_t x=0; x<head.biWidth; x++){
+ c = BlindGetPixelColor(x,y);
+ if (bAlphaIsValid) a=(BlindAlphaGet(x,y)*info.nAlphaMax)/255; else a=info.nAlphaMax;
+ if (bAlphaPaletteIsValid) a=(c.rgbReserved*a)/255;
+ a1 = 256-a;
+ c.rgbBlue = (uint8_t)((c.rgbBlue * a + a1 * info.nBkgndColor.rgbBlue)>>8);
+ c.rgbGreen = (uint8_t)((c.rgbGreen * a + a1 * info.nBkgndColor.rgbGreen)>>8);
+ c.rgbRed = (uint8_t)((c.rgbRed * a + a1 * info.nBkgndColor.rgbRed)>>8);
+ tmp.BlindSetPixelColor(x,y,c);
+ }
+ }
+ Transfer(tmp);
+ }
+ return;
+}
+////////////////////////////////////////////////////////////////////////////////
+bool CxImage::AlphaFlip()
+{
+ if (!pAlpha) return false;
+
+ uint8_t *buff = (uint8_t*)malloc(head.biWidth);
+ if (!buff) return false;
+
+ uint8_t *iSrc,*iDst;
+ iSrc = pAlpha + (head.biHeight-1)*head.biWidth;
+ iDst = pAlpha;
+ for (int32_t i=0; i<(head.biHeight/2); ++i)
+ {
+ memcpy(buff, iSrc, head.biWidth);
+ memcpy(iSrc, iDst, head.biWidth);
+ memcpy(iDst, buff, head.biWidth);
+ iSrc-=head.biWidth;
+ iDst+=head.biWidth;
+ }
+
+ free(buff);
+
+ return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+bool CxImage::AlphaMirror()
+{
+ if (!pAlpha) return false;
+ uint8_t* pAlpha2 = (uint8_t*)malloc(head.biWidth * head.biHeight);
+ if (!pAlpha2) return false;
+ uint8_t *iSrc,*iDst;
+ int32_t wdt=head.biWidth-1;
+ iSrc=pAlpha + wdt;
+ iDst=pAlpha2;
+ for(int32_t y=0; y < head.biHeight; y++){
+ for(int32_t x=0; x <= wdt; x++)
+ *(iDst+x)=*(iSrc-x);
+ iSrc+=head.biWidth;
+ iDst+=head.biWidth;
+ }
+ free(pAlpha);
+ pAlpha=pAlpha2;
+ return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Exports the alpha channel in a 8bpp grayscale image.
+ */
+bool CxImage::AlphaSplit(CxImage *dest)
+{
+ if (!pAlpha || !dest) return false;
+
+ CxImage tmp(head.biWidth,head.biHeight,8);
+ if (!tmp.IsValid()){
+ strcpy(info.szLastError,tmp.GetLastError());
+ return false;
+ }
+
+ uint8_t* src = pAlpha;
+ uint8_t* dst = tmp.info.pImage;
+ for (int32_t y=0; y<head.biHeight; y++){
+ memcpy(dst,src,head.biWidth);
+ dst += tmp.info.dwEffWidth;
+ src += head.biWidth;
+ }
+
+ tmp.SetGrayPalette();
+ dest->Transfer(tmp);
+
+ return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Exports the alpha palette channel in a 8bpp grayscale image.
+ */
+bool CxImage::AlphaPaletteSplit(CxImage *dest)
+{
+ if (!AlphaPaletteIsValid() || !dest) return false;
+
+ CxImage tmp(head.biWidth,head.biHeight,8);
+ if (!tmp.IsValid()){
+ strcpy(info.szLastError,tmp.GetLastError());
+ return false;
+ }
+
+ for(int32_t y=0; y<head.biHeight; y++){
+ for(int32_t x=0; x<head.biWidth; x++){
+ tmp.BlindSetPixelIndex(x,y,BlindGetPixelColor(x,y).rgbReserved);
+ }
+ }
+
+ tmp.SetGrayPalette();
+ dest->Transfer(tmp);
+
+ return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Merge in the alpha layer the transparent color mask
+ * (previously set with SetTransColor or SetTransIndex)
+ */
+bool CxImage::AlphaFromTransparency()
+{
+ if (!IsValid() || !IsTransparent())
+ return false;
+
+ AlphaCreate();
+
+ for(int32_t y=0; y<head.biHeight; y++){
+ for(int32_t x=0; x<head.biWidth; x++){
+ if (IsTransparent(x,y)){
+ AlphaSet(x,y,0);
+ }
+ }
+ }
+ return true;
+}
+////////////////////////////////////////////////////////////////////////////////
+#endif //CXIMAGE_SUPPORT_ALPHA
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