From c91847d549cc1c30eb15504a15ea9a6d5aa48165 Mon Sep 17 00:00:00 2001
From: "chirs241097@gmail.com"
 <chirs241097@gmail.com@c17bf020-1265-9734-9302-a83f62007ddb>
Date: Sun, 12 Jan 2014 14:43:14 +0000
Subject:

---
 hge/CxImage/ximalpha.cpp | 367 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 367 insertions(+)
 create mode 100644 hge/CxImage/ximalpha.cpp

(limited to 'hge/CxImage/ximalpha.cpp')

diff --git a/hge/CxImage/ximalpha.cpp b/hge/CxImage/ximalpha.cpp
new file mode 100644
index 0000000..2932068
--- /dev/null
+++ b/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
-- 
cgit v1.2.3