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16bitBlt.cpp
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// 16bitBlt.cpp
//
// Blt routines
#include <windows.h>
#include "Alchemy.h"
#include "DirectXUtil.h"
#include <math.h>
#include <stdio.h>
#include "Euclid.h"
#include "NoiseImpl.h"
#define INTERPOLATE(pos,lineInc,XYFloat,xInt,yInt,result) \
{ \
WORD a = (*(pos)); \
WORD b = (*((pos) + (lineInc))); \
WORD c = (*((pos) + 1)); \
WORD d = (*((pos) + (lineInc) + 1)); \
Metric xf = (XYFloat).GetX() - (Metric)(xInt); \
Metric yf = (XYFloat).GetY() - (Metric)(yInt); \
\
Metric ka = (1.0 - xf) * (1.0 - yf); \
Metric kb = (1.0 - xf) * yf; \
Metric kc = xf * (1.0 - yf); \
Metric kd = xf * yf; \
\
int iBackCount = 0; \
if (a == DEFAULT_TRANSPARENT_COLOR) { a = 0; iBackCount++; } \
if (b == DEFAULT_TRANSPARENT_COLOR) { b = 0; iBackCount++; } \
if (c == DEFAULT_TRANSPARENT_COLOR) { c = 0; iBackCount++; } \
if (d == DEFAULT_TRANSPARENT_COLOR) { d = 0; iBackCount++; } \
\
if (iBackCount != 4) \
{ \
DWORD red = (DWORD)(ka * CG16bitImage::RedValue(a) \
+ kb * CG16bitImage::RedValue(b) \
+ kc * CG16bitImage::RedValue(c) \
+ kd * CG16bitImage::RedValue(d)); \
\
DWORD green = (DWORD)(ka * CG16bitImage::GreenValue(a) \
+ kb * CG16bitImage::GreenValue(b) \
+ kc * CG16bitImage::GreenValue(c) \
+ kd * CG16bitImage::GreenValue(d)); \
\
DWORD blue = (DWORD)(ka * CG16bitImage::BlueValue(a) \
+ kb * CG16bitImage::BlueValue(b) \
+ kc * CG16bitImage::BlueValue(c) \
+ kd * CG16bitImage::BlueValue(d)); \
\
(result) = CG16bitImage::RGBValue((WORD)red, (WORD)green, (WORD)blue); \
} \
}
#define INTERPOLATE_ALPHA(pos,alphaInv,lineInc,XYFloat,xInt,yInt,result) \
{ \
WORD a = (*(pos)); \
WORD b = (*((pos) + (lineInc))); \
WORD c = (*((pos) + 1)); \
WORD d = (*((pos) + (lineInc) + 1)); \
Metric xf = (XYFloat).GetX() - (Metric)(xInt); \
Metric yf = (XYFloat).GetY() - (Metric)(yInt); \
\
Metric ka = (1.0 - xf) * (1.0 - yf); \
Metric kb = (1.0 - xf) * yf; \
Metric kc = xf * (1.0 - yf); \
Metric kd = xf * yf; \
\
DWORD red = (DWORD)(ka * CG16bitImage::RedValue(a) \
+ kb * CG16bitImage::RedValue(b) \
+ kc * CG16bitImage::RedValue(c) \
+ kd * CG16bitImage::RedValue(d)); \
\
DWORD green = (DWORD)(ka * CG16bitImage::GreenValue(a) \
+ kb * CG16bitImage::GreenValue(b) \
+ kc * CG16bitImage::GreenValue(c) \
+ kd * CG16bitImage::GreenValue(d)); \
\
DWORD blue = (DWORD)(ka * CG16bitImage::BlueValue(a) \
+ kb * CG16bitImage::BlueValue(b) \
+ kc * CG16bitImage::BlueValue(c) \
+ kd * CG16bitImage::BlueValue(d)); \
\
red = red + (DWORD)(alphaInv * CG16bitImage::RedValue((result))); \
green = green + (DWORD)(alphaInv * CG16bitImage::GreenValue((result))); \
blue = blue + (DWORD)(alphaInv * CG16bitImage::BlueValue((result))); \
(result) = CG16bitImage::RGBValue((WORD)Min(red, (DWORD)255), (WORD)Min(green, (DWORD)255), (WORD)Min(blue, (DWORD)255)); \
}
#define INTERPOLATE_ALPHA_GRAY(pos,alphaInv,lineInc,XYFloat,xInt,yInt,result) \
{ \
WORD a = (*(pos)); \
WORD b = (*((pos) + (lineInc))); \
WORD c = (*((pos) + 1)); \
WORD d = (*((pos) + (lineInc) + 1)); \
WORD ag = CG16bitImage::DesaturateValue(a); \
WORD bg = CG16bitImage::DesaturateValue(b); \
WORD cg = CG16bitImage::DesaturateValue(c); \
WORD dg = CG16bitImage::DesaturateValue(d); \
Metric xf = (XYFloat).GetX() - (Metric)(xInt); \
Metric yf = (XYFloat).GetY() - (Metric)(yInt); \
\
Metric ka = (1.0 - xf) * (1.0 - yf); \
Metric kb = (1.0 - xf) * yf; \
Metric kc = xf * (1.0 - yf); \
Metric kd = xf * yf; \
\
DWORD gray = (DWORD)(ka * ag \
+ kb * bg \
+ kc * cg \
+ kd * dg); \
\
DWORD red = gray + (DWORD)(alphaInv * CG16bitImage::RedValue((result))); \
DWORD green = gray + (DWORD)(alphaInv * CG16bitImage::GreenValue((result))); \
DWORD blue = gray + (DWORD)(alphaInv * CG16bitImage::BlueValue((result))); \
(result) = CG16bitImage::RGBValue((WORD)Min(red, (DWORD)255), (WORD)Min(green, (DWORD)255), (WORD)Min(blue, (DWORD)255)); \
}
#define INTERPOLATE_COPY(pos,lineInc,XYFloat,xInt,yInt,result) \
{ \
WORD a = (*(pos)); \
WORD b = (*((pos) + (lineInc))); \
WORD c = (*((pos) + 1)); \
WORD d = (*((pos) + (lineInc) + 1)); \
Metric xf = (XYFloat).GetX() - (Metric)(xInt); \
Metric yf = (XYFloat).GetY() - (Metric)(yInt); \
\
Metric ka = (1.0 - xf) * (1.0 - yf); \
Metric kb = (1.0 - xf) * yf; \
Metric kc = xf * (1.0 - yf); \
Metric kd = xf * yf; \
\
int iBackCount = 0; \
if (a == DEFAULT_TRANSPARENT_COLOR) { a = 0; iBackCount++; } \
if (b == DEFAULT_TRANSPARENT_COLOR) { b = 0; iBackCount++; } \
if (c == DEFAULT_TRANSPARENT_COLOR) { c = 0; iBackCount++; } \
if (d == DEFAULT_TRANSPARENT_COLOR) { d = 0; iBackCount++; } \
\
if (iBackCount == 4) \
(result) = DEFAULT_TRANSPARENT_COLOR; \
else \
{ \
DWORD red = (DWORD)(ka * CG16bitImage::RedValue(a) \
+ kb * CG16bitImage::RedValue(b) \
+ kc * CG16bitImage::RedValue(c) \
+ kd * CG16bitImage::RedValue(d)); \
\
DWORD green = (DWORD)(ka * CG16bitImage::GreenValue(a) \
+ kb * CG16bitImage::GreenValue(b) \
+ kc * CG16bitImage::GreenValue(c) \
+ kd * CG16bitImage::GreenValue(d)); \
\
DWORD blue = (DWORD)(ka * CG16bitImage::BlueValue(a) \
+ kb * CG16bitImage::BlueValue(b) \
+ kc * CG16bitImage::BlueValue(c) \
+ kd * CG16bitImage::BlueValue(d)); \
\
(result) = CG16bitImage::RGBValue((WORD)red, (WORD)green, (WORD)blue); \
} \
}
#define INTERPOLATE_GRAY(pos,lineInc,XYFloat,xInt,yInt,result) \
{ \
WORD a = (*(pos)); \
WORD b = (*((pos) + (lineInc))); \
WORD c = (*((pos) + 1)); \
WORD d = (*((pos) + (lineInc) + 1)); \
WORD ag = CG16bitImage::DesaturateValue(a); \
WORD bg = CG16bitImage::DesaturateValue(b); \
WORD cg = CG16bitImage::DesaturateValue(c); \
WORD dg = CG16bitImage::DesaturateValue(d); \
Metric xf = (XYFloat).GetX() - (Metric)(xInt); \
Metric yf = (XYFloat).GetY() - (Metric)(yInt); \
\
Metric ka = (1.0 - xf) * (1.0 - yf); \
Metric kb = (1.0 - xf) * yf; \
Metric kc = xf * (1.0 - yf); \
Metric kd = xf * yf; \
\
int iBackCount = 0; \
if (a == DEFAULT_TRANSPARENT_COLOR) { ag = 0; iBackCount++; } \
if (b == DEFAULT_TRANSPARENT_COLOR) { bg = 0; iBackCount++; } \
if (c == DEFAULT_TRANSPARENT_COLOR) { cg = 0; iBackCount++; } \
if (d == DEFAULT_TRANSPARENT_COLOR) { dg = 0; iBackCount++; } \
\
if (iBackCount != 4) \
{ \
DWORD gray = (DWORD)(ka * ag \
+ kb * bg \
+ kc * cg \
+ kd * dg); \
\
(result) = CG16bitImage::RGBValue((WORD)gray, (WORD)gray, (WORD)gray); \
} \
}
bool CalcBltTransform (Metric rX,
Metric rY,
Metric rScaleX,
Metric rScaleY,
Metric rRotation,
int xSrc,
int ySrc,
int cxSrc,
int cySrc,
CXForm *retSrcToDest,
CXForm *retDestToSrc,
RECT *retrcDest)
{
// Eliminate some simple edge conditions
if (cxSrc <= 0 || cySrc <= 0 || rScaleX <= 0.0 || rScaleY <= 0.0)
return false;
// Compute the center of the source in source coordinates
int xSrcCenter = xSrc + (cxSrc / 2);
int ySrcCenter = ySrc + (cySrc / 2);
// Create a transform from source coords to destination
*retSrcToDest
// First move the source origin to the center
= CXForm(xformTranslate, -xSrcCenter, -ySrcCenter)
// Next, scale up the source
* CXForm(xformScale, rScaleX, rScaleY)
// Then rotate
* CXForm(xformRotate, -rRotation)
// Now move to the proper location
* CXForm(xformTranslate, rX, rY);
// Now create the inverse transfor (from dest to source)
*retDestToSrc = CXForm(xformTranslate, -rX, -rY)
* CXForm(xformRotate, rRotation)
* CXForm(xformScale, 1.0 / rScaleX, 1.0 / rScaleY)
* CXForm(xformTranslate, xSrcCenter, ySrcCenter);
// Transform the four corners of the source to see where they
// end up on the destination
CVector vSrcUL = retSrcToDest->Transform(CVector(xSrc, ySrc));
CVector vSrcUR = retSrcToDest->Transform(CVector(xSrc + cxSrc, ySrc));
CVector vSrcLL = retSrcToDest->Transform(CVector(xSrc, ySrc + cySrc));
CVector vSrcLR = retSrcToDest->Transform(CVector(xSrc + cxSrc, ySrc + cySrc));
// Now figure out the axis-aligned box in which the source will
// be in destination coordinates
Metric rLeft = Min(Min(vSrcUL.GetX(), vSrcUR.GetX()), Min(vSrcLL.GetX(), vSrcLR.GetX()));
Metric rRight = Max(Max(vSrcUL.GetX(), vSrcUR.GetX()), Max(vSrcLL.GetX(), vSrcLR.GetX()));
Metric rTop = Min(Min(vSrcUL.GetY(), vSrcUR.GetY()), Min(vSrcLL.GetY(), vSrcLR.GetY()));
Metric rBottom = Max(Max(vSrcUL.GetY(), vSrcUR.GetY()), Max(vSrcLL.GetY(), vSrcLR.GetY()));
// Generate the rect
retrcDest->left = (int)rLeft;
retrcDest->right = retrcDest->left + (int)(rRight - rLeft);
retrcDest->top = (int)rTop;
retrcDest->bottom = retrcDest->top + (int)(rBottom - rTop);
// Done
return (RectWidth(*retrcDest) > 0 ) && (RectHeight(*retrcDest) > 0);
}
void CopyBltColorize (CG16bitImage &Dest,
int xDest,
int yDest,
int cxDest,
int cyDest,
const CG16bitImage &Src,
int xSrc,
int ySrc,
DWORD dwHue,
DWORD dwSaturation)
// CopyBltColorize
//
// Blts the source to the destination and colorizes to the given color.
// NOTE: We copy the source mask over, if any.
//
// See: Computer Graphics, Foley & van Dam, p.593.
{
// Compute the color
CG32bitPixel rgbBlack = CG32bitPixel(0, 0, 0);
CG32bitPixel rgbWhite = CG32bitPixel(255, 255, 255);
CG32bitPixel rgbHue = CGRealRGB::FromHSB(CGRealHSB((Metric)dwHue, 1.0, 1.0));
CG32bitPixel rgbColor = CG32bitPixel::Blend(CG32bitPixel(128, 128, 128), rgbHue, dwSaturation / 100.0);
// Different code paths depending on whether we have alpha values or not
if (Src.HasAlpha() && Dest.HasAlpha())
{
// Loop over every pixel in the destination
WORD *pSrcRow = Src.GetPixel(Src.GetRowStart(ySrc), xSrc);
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
BYTE *pSrcRowAlpha = Src.GetAlphaValue(xSrc, ySrc);
BYTE *pDestRowAlpha = Dest.GetAlphaValue(xDest, yDest);
while (pDestRow < pDestRowEnd)
{
WORD *pSrcPos = pSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
BYTE *pSrcAlpha = pSrcRowAlpha;
BYTE *pDestAlpha = pDestRowAlpha;
while (pDestPos < pDestPosEnd)
{
// Convert color
WORD wSrc = *pSrcPos;
DWORD srcBrightness = CG32bitPixel::Desaturate(CG32bitPixel(wSrc)).GetRed();
double rB = srcBrightness / 255.0;
CG32bitPixel rgbResult = CG32bitPixel::Blend3(rgbBlack, rgbColor, rgbWhite, 2.0 * (rB - 1.0) + 1.0);
*pDestPos = CG16bitPixel::RGBToPixel(rgbResult);
// Copy alpha value
*pDestAlpha++ = *pSrcAlpha++;
// Next
pSrcPos++;
pDestPos++;
}
pSrcRow = Src.NextRow(pSrcRow);
pDestRow = Dest.NextRow(pDestRow);
pSrcRowAlpha = Src.NextAlphaRow(pSrcRowAlpha);
pDestRowAlpha = Dest.NextAlphaRow(pDestRowAlpha);
}
}
// LATER: Handle case of alpha blt on non-alpha blt
else
{
WORD wSrcBackColor = Src.GetBackColor();
WORD wDestBackColor = Dest.GetBackColor();
// Loop over every pixel in the destination
WORD *pSrcRow = Src.GetPixel(Src.GetRowStart(ySrc), xSrc);
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
while (pDestRow < pDestRowEnd)
{
WORD *pSrcPos = pSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
while (pDestPos < pDestPosEnd)
{
WORD wSrc = *pSrcPos;
if (wSrc == wSrcBackColor)
*pDestPos = wDestBackColor;
else
{
DWORD srcBrightness = CG32bitPixel::Desaturate(CG32bitPixel(wSrc)).GetRed();
double rB = srcBrightness / 255.0;
CG32bitPixel rgbResult = CG32bitPixel::Blend3(rgbBlack, rgbColor, rgbWhite, 2.0 * (rB - 1.0) + 1.0);
*pDestPos = CG16bitPixel::RGBToPixel(rgbResult);
}
// Next
pSrcPos++;
pDestPos++;
}
pSrcRow = Src.NextRow(pSrcRow);
pDestRow = Dest.NextRow(pDestRow);
}
}
}
void CopyBltTransformed (CG16bitImage &Dest,
const RECT &rcDest,
const CG16bitImage &Src,
const RECT &rcSrc,
const CXForm &SrcToDest,
const CXForm &DestToSrc,
const RECT &rcDestXForm)
// CopyBltTransformed
//
// Blts the source to the destination. All transformations are from the
// center of the source.
{
int xDest = rcDest.left;
int yDest = rcDest.top;
int cxDest = RectWidth(rcDest);
int cyDest = RectHeight(rcDest);
int xSrc = rcSrc.left;
int ySrc = rcSrc.top;
int cxSrc = RectWidth(rcSrc);
int cySrc = RectHeight(rcSrc);
int xSrcEnd = xSrc + cxSrc;
int ySrcEnd = ySrc + cySrc;
// Compute vectors that move us by 1 pixel
CVector vOrigin = DestToSrc.Transform(CVector(0.0, 0.0));
CVector vIncX = DestToSrc.Transform(CVector(1.0, 0.0)) - vOrigin;
CVector vIncY = DestToSrc.Transform(CVector(0.0, 1.0)) - vOrigin;
int iRowHeight = Src.GetRowStart(1) - Src.GetRowStart(0);
// Different code paths depending on whether we have alpha values or not
if (Src.HasAlpha() && Dest.HasAlpha())
{
// Loop over every pixel in the destination
CVector vSrcRow = DestToSrc.Transform(CVector(rcDestXForm.left, rcDestXForm.top));
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
BYTE *pDestRowAlpha = Dest.GetAlphaValue(xDest, yDest);
while (pDestRow < pDestRowEnd)
{
CVector vSrcPos = vSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
BYTE *pDestAlpha = pDestRowAlpha;
while (pDestPos < pDestPosEnd)
{
int xSrcPos = (int)vSrcPos.GetX();
int ySrcPos = (int)vSrcPos.GetY();
if (xSrcPos >= xSrc && xSrcPos + 1 < xSrcEnd
&& ySrcPos >= ySrc && ySrcPos + 1 < ySrcEnd)
{
WORD *pSrcPos = Src.GetPixel(Src.GetRowStart(ySrcPos), xSrcPos);
BYTE byAlpha = *Src.GetAlphaValue(xSrcPos, ySrcPos);
if (byAlpha == 0)
*pDestAlpha = 0;
else if (byAlpha == 255)
{
INTERPOLATE_COPY(pSrcPos, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
*pDestAlpha = 255;
}
else
{
INTERPOLATE_COPY(pSrcPos, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
*pDestAlpha = byAlpha;
}
}
else
*pDestAlpha = 0;
// Next
vSrcPos = vSrcPos + vIncX;
pDestPos++;
pDestAlpha++;
}
// Next row
vSrcRow = vSrcRow + vIncY;
pDestRow = Dest.NextRow(pDestRow);
pDestRowAlpha = Dest.NextAlphaRow(pDestRowAlpha);
}
}
else
{
// Loop over every pixel in the destination
CVector vSrcRow = DestToSrc.Transform(CVector(rcDestXForm.left, rcDestXForm.top));
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
while (pDestRow < pDestRowEnd)
{
CVector vSrcPos = vSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
while (pDestPos < pDestPosEnd)
{
int xSrcPos = (int)vSrcPos.GetX();
int ySrcPos = (int)vSrcPos.GetY();
if (xSrcPos >= xSrc && xSrcPos + 1 < xSrcEnd
&& ySrcPos >= ySrc && ySrcPos + 1 < ySrcEnd)
{
WORD *pSrcPos = Src.GetPixel(Src.GetRowStart(ySrcPos), xSrcPos);
INTERPOLATE_COPY(pSrcPos, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
}
// Next
vSrcPos = vSrcPos + vIncX;
pDestPos++;
}
// Next row
vSrcRow = vSrcRow + vIncY;
pDestRow = Dest.NextRow(pDestRow);
}
}
}
void DrawBltRotated (CG16bitImage &Dest,
int xDest,
int yDest,
int iRotation,
const CG16bitImage &Src,
int xSrc,
int ySrc,
int cxSrc,
int cySrc)
// DrawBltRotated
//
// Draws the source image with its center at xDest, yDest and rotated
// by iRotation angle (in degrees)
{
DrawBltTransformed(Dest, xDest, yDest, 1.0, 1.0, iRotation, Src, xSrc, ySrc, cxSrc, cySrc);
}
void DrawBltScaledFast (CG16bitImage &Dest,
int xDest,
int yDest,
int cxDest,
int cyDest,
const CG16bitImage &Src,
int xSrc,
int ySrc,
int cxSrc,
int cySrc)
// DrawBltScaledFast
//
// Scales the source image to fit in the destination
{
if (cxDest <= 0 || cyDest <= 0 || cxSrc <= 0 || cySrc <= 0)
return;
// Compute the increment on the source to cover the entire destination
Metric xSrcInc = (Metric)cxSrc / (Metric)cxDest;
Metric ySrcInc = (Metric)cySrc / (Metric)cyDest;
// Make sure we're in bounds
Metric xSrcStart = (Metric)xSrc;
Metric ySrcStart = (Metric)ySrc;
if (!Dest.AdjustScaledCoords(&xSrcStart, &ySrcStart, Src.GetWidth(), Src.GetHeight(),
xSrcInc, ySrcInc,
&xDest, &yDest,
&cxDest, &cyDest))
return;
// Do the blt
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
Metric y = ySrcStart;
while (pDestRow < pDestRowEnd)
{
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestPos + cxDest;
WORD *pSrcRow = Src.GetPixel(Src.GetRowStart((int)y), (int)xSrcStart);
Metric xOffset = 0.0;
while (pDestPos < pDestPosEnd)
{
*pDestPos++ = *(pSrcRow + (int)xOffset);
xOffset += xSrcInc;
}
y += ySrcInc;
pDestRow = Dest.NextRow(pDestRow);
}
}
void DrawBltShimmer (CG16bitImage &Dest,
int xDest,
int yDest,
int cxDest,
int cyDest,
const CG16bitImage &Src,
int xSrc,
int ySrc,
DWORD byIntensity,
DWORD dwSeed)
// DrawBltShimmer
//
// Draws shimmer
{
const DWORD LARGE_PRIME1 = 433494437;
const DWORD LARGE_PRIME2 = 3010349;
// Make sure we're in bounds
if (!Dest.AdjustCoords(&xSrc, &ySrc, Src.GetWidth(), Src.GetHeight(),
&xDest, &yDest,
&cxDest, &cyDest))
return;
// We need noise
NoiseInit();
// Initialize
WORD *pSrcRow = Src.GetPixel(Src.GetRowStart(ySrc), xSrc);
WORD *pSrcRowEnd = Src.GetPixel(Src.GetRowStart(ySrc + cyDest), xSrc);
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
// If we've got an alpha mask then blt using the transparency
// information.
if (Src.HasAlpha())
{
DWORD dwRnd = LARGE_PRIME2 * dwSeed;
BYTE *pAlphaSrcRow = Src.GetAlphaValue(xSrc, ySrc);
while (pSrcRow < pSrcRowEnd)
{
BYTE *pAlphaPos = pAlphaSrcRow;
WORD *pSrcPos = pSrcRow;
WORD *pSrcPosEnd = pSrcRow + cxDest;
WORD *pDestPos = pDestRow;
while (pSrcPos < pSrcPosEnd)
{
if (*pAlphaPos == 0)
{
}
else if (*pAlphaPos == 255 || *pDestPos == 0)
{
if (PERM((DWORD)pDestPos * LARGE_PRIME2 + dwRnd) < byIntensity)
*pDestPos = *pSrcPos;
}
else
{
if (PERM((DWORD)pDestPos * LARGE_PRIME2 + dwRnd) < byIntensity)
{
DWORD pxSource = *pSrcPos;
DWORD pxDest = *pDestPos;
// x ^ 0xff is the same as 255 - x
// | 0x07 so that we round-up
// + 1 because below we divide by 256 instead of 255.
// LATER: Use a table lookup
DWORD dwInvTrans = ((((DWORD)(*pAlphaPos)) ^ 0xff) | 0x07) + 1;
WORD wRedSrc = (*pSrcPos >> 11) & 0x1f;
WORD wGreenSrc = (*pSrcPos >> 5) & 0x3f;
WORD wBlueSrc = (*pSrcPos) & 0x1f;
WORD wRedDest = ((WORD)dwInvTrans * ((*pDestPos >> 11) & 0x1f)) >> 8;
WORD wGreenDest = ((WORD)dwInvTrans * ((*pDestPos >> 5) & 0x3f)) >> 8;
WORD wBlueDest = ((WORD)dwInvTrans * ((*pDestPos) & 0x1f)) >> 8;
WORD wRedResult = Min((WORD)0x1f, (WORD)(wRedSrc + wRedDest));
WORD wGreenResult = Min((WORD)0x3f, (WORD)(wGreenSrc + wGreenDest));
WORD wBlueResult = Min((WORD)0x1f, (WORD)(wBlueSrc + wBlueDest));
*pDestPos = (wRedResult << 11) | (wGreenResult << 5) | wBlueResult;
}
}
pDestPos++;
pSrcPos++;
pAlphaPos++;
}
pSrcRow = Src.NextRow(pSrcRow);
pDestRow = Dest.NextRow(pDestRow);
pAlphaSrcRow = Src.NextAlphaRow(pAlphaSrcRow);
}
}
// If we've got constant transparency then use the alpha tables
else if (Src.IsTransparent())
{
#ifdef LATER
while (pSrcRow < pSrcRowEnd)
{
WORD *pSrcPos = pSrcRow;
WORD *pSrcPosEnd = pSrcRow + cxWidth;
WORD *pDestPos = pDestRow;
while (pSrcPos < pSrcPosEnd)
if (*pSrcPos == m_wBackColor)
{
pDestPos++;
pSrcPos++;
}
else
{
// Blend the pixel using the appropriate tables
WORD rgbRed = Source.m_pRedAlphaTable[((*pSrcPos & 0xf800) >> 6) | ((*pDestPos & 0xf800) >> 11)];
WORD rgbGreen = Source.m_pGreenAlphaTable[((*pSrcPos & 0x7e0) << 1) | ((*pDestPos & 0x7e0) >> 5)];
WORD rgbBlue = Source.m_pBlueAlphaTable[(*pSrcPos & 0x1f) << 5 | (*pDestPos & 0x1f)];
*pDestPos++ = rgbRed | rgbGreen | rgbBlue;
pSrcPos++;
}
pSrcRow = Source.NextRow(pSrcRow);
pDestRow = NextRow(pDestRow);
}
#endif
}
// Otherwise just blt
else
{
DWORD dwRnd = LARGE_PRIME2 * dwSeed;
WORD wSrcBackColor = Src.GetBackColor();
while (pSrcRow < pSrcRowEnd)
{
WORD *pSrcPos = pSrcRow;
WORD *pSrcPosEnd = pSrcRow + cxDest;
WORD *pDestPos = pDestRow;
while (pSrcPos < pSrcPosEnd)
{
if ((*pSrcPos != wSrcBackColor)
&& (PERM((DWORD)pDestPos * LARGE_PRIME2 + dwRnd) < byIntensity))
*pDestPos = *pSrcPos;
pDestPos++;
pSrcPos++;
}
dwRnd *= LARGE_PRIME1;
pSrcRow = Src.NextRow(pSrcRow);
pDestRow = Dest.NextRow(pDestRow);
}
}
}
void DrawBltTransformed (CG16bitImage &Dest,
Metric rX,
Metric rY,
Metric rScaleX,
Metric rScaleY,
Metric rRotation,
const CG16bitImage &Src,
int xSrc,
int ySrc,
int cxSrc,
int cySrc)
// DrawBltTransformed
//
// Blts the source to the destination. All transformations are from the
// center of the source.
{
CXForm SrcToDest;
CXForm DestToSrc;
RECT rcDest;
if (!CalcBltTransform(rX, rY, rScaleX, rScaleY, rRotation, xSrc, ySrc, cxSrc, cySrc, &SrcToDest, &DestToSrc, &rcDest))
return;
// Bounds check on the destination
int cxDest = RectWidth(rcDest);
int cyDest = RectHeight(rcDest);
int xDest = rcDest.left;
if (xDest < 0)
{
cxDest += xDest;
xDest = 0;
}
int yDest = rcDest.top;
if (yDest < 0)
{
cyDest += yDest;
yDest = 0;
}
if (xDest + cxDest > Dest.GetWidth())
cxDest = Dest.GetWidth() - xDest;
if (yDest + cyDest > Dest.GetHeight())
cyDest = Dest.GetHeight() - yDest;
if (cxDest <= 0 || cyDest <= 0)
return;
int xSrcEnd = xSrc + cxSrc;
int ySrcEnd = ySrc + cySrc;
// Compute vectors that move us by 1 pixel
CVector vOrigin = DestToSrc.Transform(CVector(0.0, 0.0));
CVector vIncX = DestToSrc.Transform(CVector(1.0, 0.0)) - vOrigin;
CVector vIncY = DestToSrc.Transform(CVector(0.0, 1.0)) - vOrigin;
int iRowHeight = Src.GetRowStart(1) - Src.GetRowStart(0);
// Different code paths depending on whether we have alpha values or not
if (Src.HasAlpha())
{
// Loop over every pixel in the destination
CVector vSrcRow = DestToSrc.Transform(CVector(xDest, yDest));
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
while (pDestRow < pDestRowEnd)
{
CVector vSrcPos = vSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
while (pDestPos < pDestPosEnd)
{
int xSrcPos = (int)vSrcPos.GetX();
int ySrcPos = (int)vSrcPos.GetY();
if (xSrcPos >= xSrc && xSrcPos + 1 < xSrcEnd
&& ySrcPos >= ySrc && ySrcPos + 1< ySrcEnd)
{
WORD *pSrcPos = Src.GetPixel(Src.GetRowStart(ySrcPos), xSrcPos);
BYTE byAlpha = *Src.GetAlphaValue(xSrcPos, ySrcPos);
if (byAlpha == 0)
NULL;
else if (byAlpha == 255)
{
INTERPOLATE(pSrcPos, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
}
else
{
Metric rAlphaInv = (Metric)(255 - byAlpha) / 255.0;
INTERPOLATE_ALPHA(pSrcPos, rAlphaInv, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
}
}
// Next
vSrcPos = vSrcPos + vIncX;
pDestPos++;
}
// Next row
vSrcRow = vSrcRow + vIncY;
pDestRow = Dest.NextRow(pDestRow);
}
}
else
{
// Loop over every pixel in the destination
CVector vSrcRow = DestToSrc.Transform(CVector(xDest, yDest));
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
while (pDestRow < pDestRowEnd)
{
CVector vSrcPos = vSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
while (pDestPos < pDestPosEnd)
{
int xSrcPos = (int)vSrcPos.GetX();
int ySrcPos = (int)vSrcPos.GetY();
if (xSrcPos >= xSrc && xSrcPos + 1 < xSrcEnd
&& ySrcPos >= ySrc && ySrcPos + 1< ySrcEnd)
{
WORD *pSrcPos = Src.GetPixel(Src.GetRowStart(ySrcPos), xSrcPos);
INTERPOLATE(pSrcPos, iRowHeight, vSrcPos, xSrcPos, ySrcPos, *pDestPos);
}
// Next
vSrcPos = vSrcPos + vIncX;
pDestPos++;
}
// Next row
vSrcRow = vSrcRow + vIncY;
pDestRow = Dest.NextRow(pDestRow);
}
}
}
void DrawBltTransformedGray (CG16bitImage &Dest,
Metric rX,
Metric rY,
Metric rScaleX,
Metric rScaleY,
Metric rRotation,
const CG16bitImage &Src,
int xSrc,
int ySrc,
int cxSrc,
int cySrc)
// DrawBltTransformedGray
//
// Blts the source to the destination. All transformations are from the
// center of the source.
{
CXForm SrcToDest;
CXForm DestToSrc;
RECT rcDest;
if (!CalcBltTransform(rX, rY, rScaleX, rScaleY, rRotation, xSrc, ySrc, cxSrc, cySrc, &SrcToDest, &DestToSrc, &rcDest))
return;
// Bounds check on the destination
int cxDest = RectWidth(rcDest);
int cyDest = RectHeight(rcDest);
int xDest = rcDest.left;
if (xDest < 0)
{
cxDest += xDest;
xDest = 0;
}
int yDest = rcDest.top;
if (yDest < 0)
{
cyDest += yDest;
yDest = 0;
}
if (xDest + cxDest > Dest.GetWidth())
cxDest = Dest.GetWidth() - xDest;
if (yDest + cyDest > Dest.GetHeight())
cyDest = Dest.GetHeight() - yDest;
if (cxDest <= 0 || cyDest <= 0)
return;
int xSrcEnd = xSrc + cxSrc;
int ySrcEnd = ySrc + cySrc;
// Compute vectors that move us by 1 pixel
CVector vOrigin = DestToSrc.Transform(CVector(0.0, 0.0));
CVector vIncX = DestToSrc.Transform(CVector(1.0, 0.0)) - vOrigin;
CVector vIncY = DestToSrc.Transform(CVector(0.0, 1.0)) - vOrigin;
int iRowHeight = Src.GetRowStart(1) - Src.GetRowStart(0);
// Different code paths depending on whether we have alpha values or not
if (Src.HasAlpha())
{
// Loop over every pixel in the destination
CVector vSrcRow = DestToSrc.Transform(CVector(xDest, yDest));
WORD *pDestRow = Dest.GetPixel(Dest.GetRowStart(yDest), xDest);
WORD *pDestRowEnd = Dest.GetPixel(Dest.GetRowStart(yDest + cyDest), xDest);
while (pDestRow < pDestRowEnd)
{
CVector vSrcPos = vSrcRow;
WORD *pDestPos = pDestRow;
WORD *pDestPosEnd = pDestRow + cxDest;
while (pDestPos < pDestPosEnd)
{
int xSrcPos = (int)vSrcPos.GetX();
int ySrcPos = (int)vSrcPos.GetY();
if (xSrcPos >= xSrc && xSrcPos + 1 < xSrcEnd
&& ySrcPos >= ySrc && ySrcPos + 1< ySrcEnd)
{
WORD *pSrcPos = Src.GetPixel(Src.GetRowStart(ySrcPos), xSrcPos);
BYTE byAlpha = *Src.GetAlphaValue(xSrcPos, ySrcPos);
if (byAlpha == 0)
NULL;
else if (byAlpha == 255)
{