diff options
Diffstat (limited to 'smelt/sdl/CxImage/ximalpha.cpp')
| -rw-r--r-- | smelt/sdl/CxImage/ximalpha.cpp | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/smelt/sdl/CxImage/ximalpha.cpp b/smelt/sdl/CxImage/ximalpha.cpp deleted file mode 100644 index 2932068..0000000 --- a/smelt/sdl/CxImage/ximalpha.cpp +++ /dev/null @@ -1,367 +0,0 @@ -// 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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