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16bitDrawCircle.cpp
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// 16bitDrawCircle.cpp
//
// Drawing routines for circles
#include <windows.h>
#include "Alchemy.h"
#include "DirectXUtil.h"
#include <math.h>
#include <stdio.h>
#include "NoiseImpl.h"
#include "DrawImpl.h"
const DWORD RED_BLUE_COUNT = (1 << 5);
const DWORD GREEN_COUNT = (1 << 6);
BYTE STOCHASTIC_OPACITY[STOCHASTIC_SIZE][256];
static bool g_bStochasticInit = false;
// DrawFilledCircle
//
// This template function calls a painter class for filled circles. The painter
// class must have a GetRadius function and a DrawLine function.
template <class PAINTER> void DrawFilledCircle (PAINTER &Painter)
{
int iRadius = Painter.GetRadius();
// Deal with edge-conditions
if (iRadius <= 0)
return;
// Initialize some stuff
int x = 0;
int y = iRadius;
int d = 1 - iRadius;
int deltaE = 3;
int deltaSE = -2 * iRadius + 5;
// Draw central line
Painter.DrawLine(iRadius, 0);
// Draw lines above and below the center
int iLastDraw = -1;
while (y > x)
{
if (d < 0)
{
d += deltaE;
deltaE += 2;
deltaSE += 2;
}
else
{
d += deltaSE;
deltaE += 2;
deltaSE += 4;
// Draw lines
Painter.DrawLine(x, y);
iLastDraw = y;
// Next
y--;
}
x++;
// Draw lines
if (x != iLastDraw)
Painter.DrawLine(y, x);
}
}
// CompositeFilledCircleFromTable ---------------------------------------------
class CCompositeFilledCircleFromTable
{
public:
CCompositeFilledCircleFromTable (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable);
~CCompositeFilledCircleFromTable (void);
void DrawLine (int x, int y);
inline int GetRadius (void) const { return m_iRadius; }
private:
CG16bitImage *m_pDest;
int m_xDest;
int m_yDest;
int m_iRadius;
WORD *m_pColorTable;
BYTE *m_pOpacityTable;
DWORD *m_pRed;
DWORD *m_pGreen;
DWORD *m_pBlue;
};
class CCompositeFilledCircleFromTableStochastic
{
public:
CCompositeFilledCircleFromTableStochastic (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable);
~CCompositeFilledCircleFromTableStochastic (void);
void DrawLine (int x, int y);
inline int GetRadius (void) const { return m_iRadius; }
private:
CG16bitImage *m_pDest;
int m_xDest;
int m_yDest;
int m_iRadius;
WORD *m_pColorTable;
BYTE *m_pOpacityTable;
DWORD *m_pRed;
DWORD *m_pGreen;
DWORD *m_pBlue;
};
void CompositeFilledCircle (CG16bitImage &Dest,
int xDest,
int yDest,
int iRadius,
WORD *pColorTable,
BYTE *pOpacityTable,
bool bStochastic)
{
if (bStochastic)
{
CCompositeFilledCircleFromTableStochastic Painter(&Dest, xDest, yDest, iRadius, pColorTable, pOpacityTable);
InitStochasticTable();
DrawFilledCircle(Painter);
}
else
{
CCompositeFilledCircleFromTable Painter(&Dest, xDest, yDest, iRadius, pColorTable, pOpacityTable);
DrawFilledCircle(Painter);
}
}
CCompositeFilledCircleFromTable::CCompositeFilledCircleFromTable (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable) :
m_pDest(pDest),
m_xDest(xDest),
m_yDest(yDest),
m_iRadius(iRadius),
m_pColorTable(pColorTable),
m_pOpacityTable(pOpacityTable),
m_pRed(NULL),
m_pGreen(NULL),
m_pBlue(NULL)
{
int i;
if (iRadius > 0)
{
m_pRed = new DWORD [iRadius];
m_pGreen = new DWORD [iRadius];
m_pBlue = new DWORD [iRadius];
for (i = 0; i < iRadius; i++)
{
WORD wColor = m_pColorTable[i];
m_pRed[i] = (wColor >> 11) & 0x1f;
m_pGreen[i] = (wColor >> 5) & 0x3f;
m_pBlue[i] = wColor & 0x1f;
}
}
}
CCompositeFilledCircleFromTable::~CCompositeFilledCircleFromTable (void)
{
if (m_pRed)
delete [] m_pRed;
if (m_pGreen)
delete [] m_pGreen;
if (m_pBlue)
delete [] m_pBlue;
}
void CCompositeFilledCircleFromTable::DrawLine (int x, int y)
{
int xStart = m_xDest - x;
int xEnd = m_xDest + x + 1;
const RECT &rcClip = m_pDest->GetClipRect();
if (xEnd <= rcClip.left || xStart >= rcClip.right)
return;
// See which lines we need to paint
int yLine = m_yDest - y;
bool bPaintTop = (yLine >= rcClip.top && yLine < rcClip.bottom);
WORD *pCenterTop = m_pDest->GetRowStart(yLine) + m_xDest;
BYTE *pCenterTopAlpha = m_pDest->GetAlphaRow(yLine) + m_xDest;
yLine = m_yDest + y;
bool bPaintBottom = ((y > 0) && (yLine >= rcClip.top && yLine < rcClip.bottom));
WORD *pCenterBottom = m_pDest->GetRowStart(yLine) + m_xDest;
BYTE *pCenterBottomAlpha = m_pDest->GetAlphaRow(yLine) + m_xDest;
// Compute radius increment
int iRadius = y;
int d = -y;
int deltaE = 3;
int deltaSE = -2 * y + 1;
// Loop
int xPos = 0;
// Paint the center point (this is a special case)
if (y == 0)
{
if (m_xDest < rcClip.right
&& m_xDest >= rcClip.left
&& bPaintTop
&& m_iRadius > 0)
{
WORD dwOpacity = m_pOpacityTable[0];
WORD wColor = m_pColorTable[0];
if (dwOpacity == 255)
{
*pCenterTop = wColor;
*pCenterTopAlpha = 255;
}
else
{
*pCenterTop = CG16bitImage::BlendPixel(*pCenterTop, wColor, dwOpacity);
*pCenterTopAlpha = CG16bitImage::BlendAlpha(*pCenterTopAlpha, (BYTE)dwOpacity);
}
}
// Continue
xPos = 1;
d += deltaSE;
deltaE += 2;
iRadius++;
}
// Blt the line
while (xPos <= x)
{
// Figure out the radius of the pixel at this location
if (d < 0)
{
d += deltaE;
deltaE += 2;
deltaSE += 2;
}
else
{
d += deltaSE;
deltaE += 2;
// deltaSE += 0;
iRadius++;
}
// Compute the transparency based on the radius
WORD dwOpacity;
if (iRadius >= m_iRadius
|| (dwOpacity = m_pOpacityTable[iRadius]) == 0)
{
// Skip
}
else
{
if (dwOpacity == 255)
{
WORD wColor = m_pColorTable[iRadius];
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
{
*(pCenterTop - xPos) = wColor;
*(pCenterTopAlpha - xPos) = 255;
}
if (bPaintBottom)
{
*(pCenterBottom - xPos) = wColor;
*(pCenterBottomAlpha - xPos) = 255;
}
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
{
*(pCenterTop + xPos) = wColor;
*(pCenterTopAlpha + xPos) = 255;
}
if (bPaintBottom)
{
*(pCenterBottom + xPos) = wColor;
*(pCenterBottomAlpha + xPos) = 255;
}
}
}
else
{
#define DRAW_PIXEL(pos, alphaPos) \
{ \
WORD dwDest = *(pos); \
WORD dwRedDest = (dwDest >> 11) & 0x1f; \
WORD dwGreenDest = (dwDest >> 5) & 0x3f; \
WORD dwBlueDest = dwDest & 0x1f; \
\
*(pos) = (WORD)((dwOpacity * (m_pBlue[iRadius] - dwBlueDest) >> 8) + dwBlueDest | \
((dwOpacity * (m_pGreen[iRadius] - dwGreenDest) >> 8) + dwGreenDest) << 5 | \
((dwOpacity * (m_pRed[iRadius] - dwRedDest) >> 8) + dwRedDest) << 11); \
\
*(alphaPos) = CG16bitImage::BlendAlpha(*(alphaPos), (BYTE)dwOpacity); \
}
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop - xPos, pCenterTopAlpha - xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom - xPos, pCenterBottomAlpha - xPos);
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop + xPos, pCenterTopAlpha + xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom + xPos, pCenterBottomAlpha + xPos);
}
#undef DRAW_PIXEL
}
}
xPos++;
}
}
// CompositeFilledCircleFromTableStochastic -----------------------------------
CCompositeFilledCircleFromTableStochastic::CCompositeFilledCircleFromTableStochastic (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable) :
m_pDest(pDest),
m_xDest(xDest),
m_yDest(yDest),
m_iRadius(iRadius),
m_pColorTable(pColorTable),
m_pOpacityTable(pOpacityTable),
m_pRed(NULL),
m_pGreen(NULL),
m_pBlue(NULL)
{
int i;
if (iRadius > 0)
{
m_pRed = new DWORD [iRadius];
m_pGreen = new DWORD [iRadius];
m_pBlue = new DWORD [iRadius];
for (i = 0; i < iRadius; i++)
{
WORD wColor = m_pColorTable[i];
m_pRed[i] = (wColor >> 11) & 0x1f;
m_pGreen[i] = (wColor >> 5) & 0x3f;
m_pBlue[i] = wColor & 0x1f;
}
}
}
CCompositeFilledCircleFromTableStochastic::~CCompositeFilledCircleFromTableStochastic (void)
{
if (m_pRed)
delete [] m_pRed;
if (m_pGreen)
delete [] m_pGreen;
if (m_pBlue)
delete [] m_pBlue;
}
void CCompositeFilledCircleFromTableStochastic::DrawLine (int x, int y)
{
int xStart = m_xDest - x;
int xEnd = m_xDest + x + 1;
const RECT &rcClip = m_pDest->GetClipRect();
if (xEnd <= rcClip.left || xStart >= rcClip.right)
return;
// See which lines we need to paint
int yLine = m_yDest - y;
bool bPaintTop = (yLine >= rcClip.top && yLine < rcClip.bottom);
WORD *pCenterTop = m_pDest->GetRowStart(yLine) + m_xDest;
BYTE *pCenterTopAlpha = m_pDest->GetAlphaRow(yLine) + m_xDest;
yLine = m_yDest + y;
bool bPaintBottom = ((y > 0) && (yLine >= rcClip.top && yLine < rcClip.bottom));
WORD *pCenterBottom = m_pDest->GetRowStart(yLine) + m_xDest;
BYTE *pCenterBottomAlpha = m_pDest->GetAlphaRow(yLine) + m_xDest;
// Compute radius increment
int iRadius = y;
int d = -y;
int deltaE = 3;
int deltaSE = -2 * y + 1;
// Loop
int xPos = 0;
// Paint the center point (this is a special case)
if (y == 0)
{
if (m_xDest < rcClip.right
&& m_xDest >= rcClip.left
&& bPaintTop
&& m_iRadius > 0)
{
WORD dwOpacity = m_pOpacityTable[0];
WORD wColor = m_pColorTable[0];
if (dwOpacity == 255)
{
*pCenterTop = wColor;
*pCenterTopAlpha = 255;
}
else
{
*pCenterTop = CG16bitImage::BlendPixel(*pCenterTop, wColor, dwOpacity);
*pCenterTopAlpha = CG16bitImage::BlendAlpha(*pCenterTopAlpha, (BYTE)dwOpacity);
}
}
// Continue
xPos = 1;
d += deltaSE;
deltaE += 2;
iRadius++;
}
int iBaseIndex = (y % STOCHASTIC_DIM) * STOCHASTIC_DIM;
// Blt the line
while (xPos <= x)
{
// Figure out the radius of the pixel at this location
if (d < 0)
{
d += deltaE;
deltaE += 2;
deltaSE += 2;
}
else
{
d += deltaSE;
deltaE += 2;
// deltaSE += 0;
iRadius++;
}
// Compute the transparency based on the radius
if (iRadius >= m_iRadius)
{
// Skip
}
else
{
// Jitter opacity
WORD dwOpacity = m_pOpacityTable[iRadius];
// Optimize full opacity
if (dwOpacity == 255)
{
WORD wColor = m_pColorTable[iRadius];
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
{
*(pCenterTop - xPos) = wColor;
*(pCenterTopAlpha - xPos) = 255;
}
if (bPaintBottom)
{
*(pCenterBottom - xPos) = wColor;
*(pCenterBottomAlpha - xPos) = 255;
}
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
{
*(pCenterTop + xPos) = wColor;
*(pCenterTopAlpha + xPos) = 255;
}
if (bPaintBottom)
{
*(pCenterBottom + xPos) = wColor;
*(pCenterBottomAlpha + xPos) = 255;
}
}
}
else
{
// Jitter
dwOpacity = STOCHASTIC_OPACITY[iBaseIndex + (xPos % STOCHASTIC_DIM)][dwOpacity];
#define DRAW_PIXEL(pos, alphaPos) \
{ \
WORD dwDest = *(pos); \
WORD dwRedDest = (dwDest >> 11) & 0x1f; \
WORD dwGreenDest = (dwDest >> 5) & 0x3f; \
WORD dwBlueDest = dwDest & 0x1f; \
\
*(pos) = (WORD)((dwOpacity * (m_pBlue[iRadius] - dwBlueDest) >> 8) + dwBlueDest | \
((dwOpacity * (m_pGreen[iRadius] - dwGreenDest) >> 8) + dwGreenDest) << 5 | \
((dwOpacity * (m_pRed[iRadius] - dwRedDest) >> 8) + dwRedDest) << 11); \
\
*(alphaPos) = CG16bitImage::BlendAlpha(*(alphaPos), (BYTE)dwOpacity); \
}
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop - xPos, pCenterTopAlpha - xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom - xPos, pCenterBottomAlpha - xPos);
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop + xPos, pCenterTopAlpha + xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom + xPos, pCenterBottomAlpha + xPos);
}
#undef DRAW_PIXEL
}
}
xPos++;
}
}
// DrawFilledCircleFromTable --------------------------------------------------
class CFilledCircleFromTable
{
public:
CFilledCircleFromTable (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable);
~CFilledCircleFromTable (void);
void DrawLine (int x, int y);
inline int GetRadius (void) const { return m_iRadius; }
private:
CG16bitImage *m_pDest;
int m_xDest;
int m_yDest;
int m_iRadius;
WORD *m_pColorTable;
BYTE *m_pOpacityTable;
DWORD *m_pRed;
DWORD *m_pGreen;
DWORD *m_pBlue;
};
void DrawFilledCircle (CG16bitImage &Dest,
int xDest,
int yDest,
int iRadius,
WORD *pColorTable,
BYTE *pOpacityTable)
{
CFilledCircleFromTable Painter(&Dest, xDest, yDest, iRadius, pColorTable, pOpacityTable);
DrawFilledCircle(Painter);
}
CFilledCircleFromTable::CFilledCircleFromTable (CG16bitImage *pDest, int xDest, int yDest, int iRadius, WORD *pColorTable, BYTE *pOpacityTable) :
m_pDest(pDest),
m_xDest(xDest),
m_yDest(yDest),
m_iRadius(iRadius),
m_pColorTable(pColorTable),
m_pOpacityTable(pOpacityTable),
m_pRed(NULL),
m_pGreen(NULL),
m_pBlue(NULL)
{
int i;
if (iRadius > 0)
{
m_pRed = new DWORD [iRadius];
m_pGreen = new DWORD [iRadius];
m_pBlue = new DWORD [iRadius];
for (i = 0; i < iRadius; i++)
{
WORD wColor = m_pColorTable[i];
m_pRed[i] = (wColor >> 11) & 0x1f;
m_pGreen[i] = (wColor >> 5) & 0x3f;
m_pBlue[i] = wColor & 0x1f;
}
}
}
CFilledCircleFromTable::~CFilledCircleFromTable (void)
{
if (m_pRed)
delete [] m_pRed;
if (m_pGreen)
delete [] m_pGreen;
if (m_pBlue)
delete [] m_pBlue;
}
void CFilledCircleFromTable::DrawLine (int x, int y)
{
int xStart = m_xDest - x;
int xEnd = m_xDest + x + 1;
const RECT &rcClip = m_pDest->GetClipRect();
if (xEnd <= rcClip.left || xStart >= rcClip.right)
return;
// See which lines we need to paint
int yLine = m_yDest - y;
bool bPaintTop = (yLine >= rcClip.top && yLine < rcClip.bottom);
WORD *pCenterTop = m_pDest->GetRowStart(yLine) + m_xDest;
yLine = m_yDest + y;
bool bPaintBottom = ((y > 0) && (yLine >= rcClip.top && yLine < rcClip.bottom));
WORD *pCenterBottom = m_pDest->GetRowStart(yLine) + m_xDest;
// Compute radius increment
int iRadius = y;
int d = -y;
int deltaE = 3;
int deltaSE = -2 * y + 1;
// Loop
int xPos = 0;
// Paint the center point (this is a special case)
if (y == 0)
{
if (m_xDest < rcClip.right
&& m_xDest >= rcClip.left
&& bPaintTop
&& m_iRadius > 0)
{
WORD dwOpacity = m_pOpacityTable[0];
WORD wColor = m_pColorTable[0];
if (dwOpacity == 255)
*pCenterTop = wColor;
else
*pCenterTop = CG16bitImage::BlendPixel(*pCenterTop, wColor, dwOpacity);
}
// Continue
xPos = 1;
d += deltaSE;
deltaE += 2;
iRadius++;
}
// Blt the line
while (xPos <= x)
{
// Figure out the radius of the pixel at this location
if (d < 0)
{
d += deltaE;
deltaE += 2;
deltaSE += 2;
}
else
{
d += deltaSE;
deltaE += 2;
// deltaSE += 0;
iRadius++;
}
// Compute the transparency based on the radius
WORD dwOpacity;
if (iRadius >= m_iRadius
|| (dwOpacity = m_pOpacityTable[iRadius]) == 0)
{
// Skip
}
else
{
if (dwOpacity == 255)
{
WORD wColor = m_pColorTable[iRadius];
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
*(pCenterTop - xPos) = wColor;
if (bPaintBottom)
*(pCenterBottom - xPos) = wColor;
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
*(pCenterTop + xPos) = wColor;
if (bPaintBottom)
*(pCenterBottom + xPos) = wColor;
}
}
else
{
#define DRAW_PIXEL(pos) \
{ \
WORD dwDest = *(pos); \
WORD dwRedDest = (dwDest >> 11) & 0x1f; \
WORD dwGreenDest = (dwDest >> 5) & 0x3f; \
WORD dwBlueDest = dwDest & 0x1f; \
\
*(pos) = (WORD)((dwOpacity * (m_pBlue[iRadius] - dwBlueDest) >> 8) + dwBlueDest | \
((dwOpacity * (m_pGreen[iRadius] - dwGreenDest) >> 8) + dwGreenDest) << 5 | \
((dwOpacity * (m_pRed[iRadius] - dwRedDest) >> 8) + dwRedDest) << 11); \
}
if (m_xDest - xPos < rcClip.right && m_xDest - xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop - xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom - xPos);
}
if (xPos > 0 && m_xDest + xPos < rcClip.right && m_xDest + xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop + xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom + xPos);
}
#undef DRAW_PIXEL
}
}
xPos++;
}
}
// DrawAlphaGradientCircle ---------------------------------------------------
struct SAlphaGradientCircleLineCtx
{
SAlphaGradientCircleLineCtx (void) :
pTrans(NULL),
pRed(NULL),
pGreen(NULL),
pBlue(NULL),
pRedByTrans(NULL),
pGreenByTrans(NULL),
pBlueByTrans(NULL),
pColorTable(NULL),
pOpacityTable(NULL)
{ }
~SAlphaGradientCircleLineCtx (void)
{
if (pTrans)
delete [] pTrans;
if (pRed)
delete [] pRed;
if (pGreen)
delete [] pGreen;
if (pBlue)
delete [] pBlue;
if (pRedByTrans)
delete [] pRedByTrans;
if (pGreenByTrans)
delete [] pGreenByTrans;
if (pBlueByTrans)
delete [] pBlueByTrans;
}
CG16bitImage *pDest;
int xDest;
int yDest;
int iRadius;
WORD wColor;
// These are pre-computed if we're calculating each pixel
DWORD dwRed;
DWORD dwGreen;
DWORD dwBlue;
WORD *pTrans;
DWORD *pRed;
DWORD *pGreen;
DWORD *pBlue;
// These are pre-computed if we are using a table
WORD *pRedByTrans;
WORD *pGreenByTrans;
WORD *pBlueByTrans;
// These are initialized if we have a radius table
WORD *pColorTable;
BYTE *pOpacityTable;
};
void DrawAlphaGradientCircleLine (const SAlphaGradientCircleLineCtx &Ctx, int x, int y)
{
int xStart = Ctx.xDest - x;
int xEnd = Ctx.xDest + x + 1;
const RECT &rcClip = Ctx.pDest->GetClipRect();
if (xEnd <= rcClip.left || xStart >= rcClip.right)
return;
// See which lines we need to paint
int yLine = Ctx.yDest - y;
bool bPaintTop = (yLine >= rcClip.top && yLine < rcClip.bottom);
WORD *pCenterTop = Ctx.pDest->GetRowStart(yLine) + Ctx.xDest;
yLine = Ctx.yDest + y;
bool bPaintBottom = ((y > 0) && (yLine >= rcClip.top && yLine < rcClip.bottom));
WORD *pCenterBottom = Ctx.pDest->GetRowStart(yLine) + Ctx.xDest;
// Compute radius increment
int iRadius = y;
int d = -y;
int deltaE = 3;
int deltaSE = -2 * y + 1;
// Loop
int xPos = 0;
// This will skip the center pixel in the circle (avoids a divide by
// zero in the inner loop).
if (y == 0)
{
xPos = 1;
d += deltaSE;
deltaE += 2;
iRadius++;
}
// Blt the line
while (xPos <= x)
{
// Figure out the radius of the pixel at this location
if (d < 0)
{
d += deltaE;
deltaE += 2;
deltaSE += 2;
}
else
{
d += deltaSE;
deltaE += 2;
// deltaSE += 0;
iRadius++;
}
// Compute the transparency based on the radius
WORD dwTrans;
if (iRadius >= Ctx.iRadius
|| (dwTrans = Ctx.pTrans[iRadius]) >= 255)
{
xPos++;
continue;
}
#define DRAW_PIXEL(pos) \
{ \
WORD dwDest = *(pos); \
WORD dwRedDest = (dwDest >> 11) & 0x1f; \
WORD dwGreenDest = (dwDest >> 5) & 0x3f; \
WORD dwBlueDest = dwDest & 0x1f; \
\
*(pos) = (WORD)((dwTrans * (Ctx.dwBlue - dwBlueDest) >> 8) + dwBlueDest | \
((dwTrans * (Ctx.dwGreen - dwGreenDest) >> 8) + dwGreenDest) << 5 | \
((dwTrans * (Ctx.dwRed - dwRedDest) >> 8) + dwRedDest) << 11); \
}
// Paint
if (Ctx.xDest - xPos < rcClip.right && Ctx.xDest - xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop - xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom - xPos);
}
if (xPos > 0 && Ctx.xDest + xPos < rcClip.right && Ctx.xDest + xPos >= rcClip.left)
{
if (bPaintTop)
DRAW_PIXEL(pCenterTop + xPos);
if (bPaintBottom)
DRAW_PIXEL(pCenterBottom + xPos);
}
#undef DRAW_PIXEL
xPos++;
}
}
void DrawAlphaGradientCircleLineTable (const SAlphaGradientCircleLineCtx &Ctx, int x, int y)
{
int xStart = Ctx.xDest - x;
int xEnd = Ctx.xDest + x + 1;
const RECT &rcClip = Ctx.pDest->GetClipRect();
if (xEnd <= rcClip.left || xStart >= rcClip.right)
return;
// See which lines we need to paint
int yLine = Ctx.yDest - y;
bool bPaintTop = (yLine >= rcClip.top && yLine < rcClip.bottom);
WORD *pCenterTop = Ctx.pDest->GetRowStart(yLine) + Ctx.xDest;
yLine = Ctx.yDest + y;
bool bPaintBottom = ((y > 0) && (yLine >= rcClip.top && yLine < rcClip.bottom));
WORD *pCenterBottom = Ctx.pDest->GetRowStart(yLine) + Ctx.xDest;
// Compute radius increment
int iRadius = y;