ref: 6159713b2a0f55e2cd41797ed7aa3a5a4c0a06a3
dir: /src/blitter.c/
// blitter.c
#include "SDLU.h"
#include "main.h"
#include "gworld.h"
#include "blitter.h"
#include "font.h"
#include "level.h"
#include "graphics.h"
MBoolean update[2][kGridAcross][kGridDown];
MBoolean refresh[2];
void InitBlitter( void )
{
int player, x, y;
for( player=0; player<=1; player++ )
{
refresh[player] = false;
for( x=0; x<kGridAcross; x++ )
{
for( y=0; y<kGridDown; y++ )
{
update[player][x][y] = false;
}
}
}
}
void UpdatePlayerWindow( int player )
{
SDL_Rect fullSDLRect, offsetSDLRect;
int x, y;
if( control[player] == kNobodyControl ) return;
if( playerWindowVisible[player] && refresh[player] )
{
MRect updateRect = {0, 0, 0, 0}, fullRect, offsetRect;
MBoolean first = true;
for( x=0; x<kGridAcross; x++ )
{
for( y=1; y<kGridDown; y++ )
{
if( update[player][x][y] )
{
updateRect.top = y * kBlobVertSize;
updateRect.left = x * kBlobHorizSize;
updateRect.bottom = updateRect.top + kBlobVertSize;
updateRect.right = updateRect.left + kBlobHorizSize;
if( first )
{
fullRect = updateRect;
first = false;
}
else
{
UnionMRect( &fullRect, &updateRect, &fullRect );
}
update[player][x][y] = false;
}
}
}
if( !first )
{
offsetRect = fullRect;
OffsetMRect( &offsetRect, playerWindowRect[player].left, playerWindowRect[player].top - kBlobVertSize );
SDLU_BlitFrontSurface( playerSpriteSurface[player],
SDLU_MRectToSDLRect( &fullRect, &fullSDLRect ),
SDLU_MRectToSDLRect( &offsetRect, &offsetSDLRect ) );
}
}
}
void SetUpdateRect( int player, MRect *where )
{
int x,y;
int xMin, xMax, yMin, yMax;
xMin = where->left / kBlobHorizSize;
xMax = ( where->right + kBlobHorizSize - 1 ) / kBlobHorizSize;
if( xMin < 0 ) xMin = 0;
if( xMin > (kGridAcross-1) ) xMin = kGridAcross-1;
if( xMax < 0 ) xMax = 0;
if( xMax > kGridAcross ) xMax = kGridAcross;
yMin = where->top / kBlobVertSize;
yMax = ( where->bottom + kBlobVertSize - 1 ) / kBlobVertSize;
if( yMin < 0 ) yMin = 0;
if( yMin > (kGridDown-1) ) yMin = kGridDown-1;
if( yMax < 0 ) yMax = 0;
if( yMax > kGridDown ) yMax = kGridDown;
for( x=xMin; x<xMax; x++ )
{
for( y=yMin; y<yMax; y++ )
{
update[player][x][y] = true;
}
}
refresh[player] = true;
}
void SurfaceBlitMask( SDL_Surface* object, SDL_Surface* mask, SDL_Surface* dest,
const MRect* objectRect, const MRect* maskRect, const MRect* destRect )
{
int startX = 0, startY = 0, endX, endY, x, y, srcRowBytes, mskRowBytes, dstRowBytes;
unsigned char *src, *msk, *dst;
MRect destBounds;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
endX = objectRect->right - objectRect->left;
endY = objectRect->bottom - objectRect->top;
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
src = (unsigned char*) object->pixels;
msk = (unsigned char*) mask->pixels;
dst = (unsigned char*) dest->pixels;
srcRowBytes = object->pitch;
mskRowBytes = mask->pitch;
dstRowBytes = dest->pitch;
src += (objectRect->top * srcRowBytes) + (objectRect->left * BYTES_PER_PIXEL);
msk += (maskRect->top * mskRowBytes) + (maskRect->left * BYTES_PER_MASK_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
msk += (mskRowBytes * startY) + (startX * BYTES_PER_MASK_PIXEL);
src += (srcRowBytes * startY) + (startX * BYTES_PER_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
for( y=startY; y<endY; y++ )
{
unsigned char *tSrc = src, *tDst = dst, *tMsk = msk;
for( x=startX; x<endX; x++ )
{
if( *msk )
{
*(COLOR_T*)dst = *(COLOR_T*)src;
}
src += BYTES_PER_PIXEL;
dst += BYTES_PER_PIXEL;
msk += BYTES_PER_MASK_PIXEL;
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
msk = tMsk + mskRowBytes;
}
}
void SurfaceBlitBlob( const MRect* blobRect, const MRect* destRect )
{
SurfaceBlitMask( blobSurface, maskSurface, SDLU_GetCurrentSurface(),
blobRect, blobRect, destRect );
}
void SurfaceBlitColor( SDL_Surface* mask, SDL_Surface* dest,
const MRect* maskRect, const MRect* destRect,
int r, int g, int b, int weight )
{
int startX = 0, startY = 0, endX, endY, x, y, mskRowBytes, dstRowBytes;
unsigned char *msk, *dst;
MRect destBounds;
endX = maskRect->right - maskRect->left;
endY = maskRect->bottom - maskRect->top;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
msk = (unsigned char*) mask->pixels;
dst = (unsigned char*) dest->pixels;
mskRowBytes = mask->pitch;
dstRowBytes = dest->pitch;
msk += (maskRect->top * mskRowBytes) + (maskRect->left * BYTES_PER_MASK_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
msk += (mskRowBytes * startY) + (startX * BYTES_PER_MASK_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
r *= weight;
g *= weight;
b *= weight;
weight = FULL_WEIGHT - weight;
for( y=startY; y<endY; y++ )
{
unsigned char *tMsk = msk, *tDst = dst;
int work, workB, workG, workR;
for( x=startX; x<endX; x++ )
{
if( *msk )
{
work = *(COLOR_T*)dst;
workB = ((((work ) & CHANNEL_MASK)*weight) + b) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK)*weight) + g) ;
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK)*weight) + r) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
dst += BYTES_PER_PIXEL;
msk += BYTES_PER_MASK_PIXEL;
}
msk = tMsk + mskRowBytes;
dst = tDst + dstRowBytes;
}
}
void SurfaceBlitAlpha( SDL_Surface* back, SDL_Surface* source, SDL_Surface* alpha, SDL_Surface* dest,
const MRect* backRect, const MRect* sourceRect, const MRect* alphaRect, const MRect* destRect )
{
int startX = 0, startY = 0, endX, endY, x, y, srcRowBytes, alfRowBytes, dstRowBytes, bckRowBytes;
unsigned char *bck, *src, *alf, *dst;
MRect destBounds;
endX = sourceRect->right - sourceRect->left;
endY = sourceRect->bottom - sourceRect->top;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
bck = (unsigned char*) back->pixels;
src = (unsigned char*) source->pixels;
alf = (unsigned char*) alpha->pixels;
dst = (unsigned char*) dest->pixels;
bckRowBytes = back->pitch;
srcRowBytes = source->pitch;
alfRowBytes = alpha->pitch;
dstRowBytes = dest->pitch;
bck += (backRect->top * bckRowBytes) + (backRect->left * BYTES_PER_PIXEL);
src += (sourceRect->top * srcRowBytes) + (sourceRect->left * BYTES_PER_PIXEL);
alf += (alphaRect->top * alfRowBytes) + (alphaRect->left * BYTES_PER_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
bck += (bckRowBytes * startY) + (startX * BYTES_PER_PIXEL);
src += (srcRowBytes * startY) + (startX * BYTES_PER_PIXEL);
alf += (alfRowBytes * startY) + (startX * BYTES_PER_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
for( y=startY; y<endY; y++ )
{
unsigned char *tSrc = src, *tAlf = alf, *tDst = dst, *tBck = bck;
int pixS, pixB, weightS, weightB, workB, workG, workR;
for( x=startX; x<endX; x++ )
{
weightB = *(COLOR_T*)alf;
if( (weightB & (RED_MASK | GREEN_MASK | BLUE_MASK)) == (RED_MASK | GREEN_MASK | BLUE_MASK))
{
*(COLOR_T*)dst = *(COLOR_T*)bck;
}
else if( (weightB & (RED_MASK | GREEN_MASK | BLUE_MASK)) == 0)
{
*(COLOR_T*)dst = *(COLOR_T*)src;
}
else
{
weightS = ~weightB;
pixS = *(COLOR_T*)src;
pixB = *(COLOR_T*)bck;
workB = ((((pixS ) & CHANNEL_MASK) * ((weightS ) & CHANNEL_MASK)) + (((pixB ) & CHANNEL_MASK) * ((weightB ) & CHANNEL_MASK))) >> BITS_PER_1CHANNEL;
workG = ((((pixS >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * ((weightS >> BITS_PER_1CHANNEL ) & CHANNEL_MASK)) + (((pixB >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * ((weightB >> BITS_PER_1CHANNEL ) & CHANNEL_MASK)));
workR = ((((pixS >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * ((weightS >> BITS_PER_2CHANNELS) & CHANNEL_MASK)) + (((pixB >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * ((weightB >> BITS_PER_2CHANNELS) & CHANNEL_MASK))) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
src += BYTES_PER_PIXEL;
alf += BYTES_PER_PIXEL;
bck += BYTES_PER_PIXEL;
dst += BYTES_PER_PIXEL;
}
bck = tBck + bckRowBytes;
src = tSrc + srcRowBytes;
alf = tAlf + alfRowBytes;
dst = tDst + dstRowBytes;
}
}
void SurfaceBlitWeightedDualAlpha(SDL_Surface* back, SDL_Surface* source, SDL_Surface* mask, SDL_Surface* alpha, SDL_Surface* dest,
const MRect* backRect, const MRect* sourceRect, const MRect* maskRect, const MRect* alphaRect, const MRect* destRect,
int inWeight )
{
int startX = 0, startY = 0, endX, endY, x, y,
srcRowBytes, alfRowBytes, mskRowBytes, dstRowBytes, bckRowBytes;
unsigned char *bck, *src, *alf, *msk, *dst;
MRect destBounds;
endX = sourceRect->right - sourceRect->left;
endY = sourceRect->bottom - sourceRect->top;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
bck = (unsigned char*) back->pixels;
src = (unsigned char*) source->pixels;
msk = (unsigned char*) mask->pixels;
alf = (unsigned char*) alpha->pixels;
dst = (unsigned char*) dest->pixels;
bckRowBytes = back->pitch;
srcRowBytes = source->pitch;
mskRowBytes = mask->pitch;
alfRowBytes = alpha->pitch;
dstRowBytes = dest->pitch;
bck += (backRect->top * bckRowBytes) + (backRect->left * BYTES_PER_PIXEL);
src += (sourceRect->top * srcRowBytes) + (sourceRect->left * BYTES_PER_PIXEL);
alf += (alphaRect->top * alfRowBytes) + (alphaRect->left * BYTES_PER_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
msk += (maskRect->top * mskRowBytes) + (maskRect->left * BYTES_PER_MASK_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
bck += (bckRowBytes * startY) + (startX * BYTES_PER_PIXEL);
src += (srcRowBytes * startY) + (startX * BYTES_PER_PIXEL);
alf += (alfRowBytes * startY) + (startX * BYTES_PER_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
msk += (mskRowBytes * startY) + (startX * BYTES_PER_MASK_PIXEL);
for( y=startY; y<endY; y++ )
{
unsigned char *tSrc = src, *tAlf = alf, *tDst = dst, *tBck = bck, *tMsk = msk;
int pixS, pixB, weightS, weightB, work, workB, workG, workR;
for( x=startX; x<endX; x++ )
{
if( *msk )
{
work = *(COLOR_T*)alf;
workB = ((((work ) & CHANNEL_MASK)*inWeight) ) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK)*inWeight) );
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK)*inWeight) ) << BITS_PER_1CHANNEL;
weightB = ~((workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK));
if( (weightB & (RED_MASK | GREEN_MASK | BLUE_MASK)) == (RED_MASK | GREEN_MASK | BLUE_MASK))
{
*(COLOR_T*)dst = *(COLOR_T*)bck;
}
else if( (weightB & (RED_MASK | GREEN_MASK | BLUE_MASK)) == 0)
{
*(COLOR_T*)dst = *(COLOR_T*)src;
}
else
{
weightS = ~weightB;
pixS = *(COLOR_T*)src;
pixB = *(COLOR_T*)bck;
workB = ((((pixS ) & CHANNEL_MASK) * ((weightS ) & CHANNEL_MASK)) + (((pixB ) & CHANNEL_MASK) * ((weightB ) & CHANNEL_MASK))) >> BITS_PER_1CHANNEL;
workG = ((((pixS >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * ((weightS >> BITS_PER_1CHANNEL ) & CHANNEL_MASK)) + (((pixB >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * ((weightB >> BITS_PER_1CHANNEL ) & CHANNEL_MASK)));
workR = ((((pixS >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * ((weightS >> BITS_PER_2CHANNELS) & CHANNEL_MASK)) + (((pixB >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * ((weightB >> BITS_PER_2CHANNELS) & CHANNEL_MASK))) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
}
src += BYTES_PER_PIXEL;
alf += BYTES_PER_PIXEL;
bck += BYTES_PER_PIXEL;
dst += BYTES_PER_PIXEL;
msk += BYTES_PER_MASK_PIXEL;
}
bck = tBck + bckRowBytes;
src = tSrc + srcRowBytes;
alf = tAlf + alfRowBytes;
dst = tDst + dstRowBytes;
msk = tMsk + mskRowBytes;
}
}
void SurfaceBlitWeightedCharacter( SkittlesFontPtr font, unsigned char text, MPoint *dPoint, int r, int g, int b, int alpha )
{
if (alpha == FULL_WEIGHT)
{
SurfaceBlitCharacter( font, text, dPoint, r, g, b, 0 );
return;
}
if (alpha == 0)
{
return;
}
SDL_Surface* destSurface;
unsigned char* src;
unsigned char* dst;
int srcRowBytes;
int dstRowBytes;
int index;
MRect destBounds;
int height = font->surface->h;
int width = font->width[text];
int across = font->across[text];
destSurface = SDLU_GetCurrentSurface();
SDLU_SDLRectToMRect( &destSurface->clip_rect, &destBounds );
if( (dPoint->h + width) > destBounds.right || // clipped?
(dPoint->v + height) > destBounds.bottom ||
dPoint->h < destBounds.left ||
dPoint->v < destBounds.top )
{
dPoint->h += width;
return; // do nothing
}
srcRowBytes = font->surface->pitch;
dstRowBytes = destSurface->pitch;
src = (unsigned char*) font->surface->pixels + across;
dst = (unsigned char*) destSurface->pixels + (dPoint->h * BYTES_PER_PIXEL) + (dPoint->v * dstRowBytes);
while( height-- )
{
unsigned char *tSrc = src, *tDst = dst;
for( index=0; index<width; index++ )
{
int workR, workG, workB, work, weightS, weightD;
weightS = *src & CHANNEL_MASK;
weightS = (weightS * alpha) >> BITS_PER_1CHANNEL;
if( weightS )
{
weightD = FULL_WEIGHT - weightS;
work = *(COLOR_T*)dst;
workB = ((((work ) & CHANNEL_MASK) * weightD) + (b * weightS)) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weightD) + (g * weightS));
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK) * weightD) + (r * weightS)) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
src++;
dst+=BYTES_PER_PIXEL;
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
}
dPoint->h += width;
}
void SurfaceBlitCharacter( SkittlesFontPtr font, unsigned char text, MPoint *dPoint, int r, int g, int b, int dropShadow )
{
SDL_Surface* destSurface;
unsigned char* src;
unsigned char* dst;
int srcRowBytes;
int dstRowBytes;
int index;
int rgbPremixed;
MRect destBounds;
int height = font->surface->h;
int width = font->width[text];
int across = font->across[text];
destSurface = SDLU_GetCurrentSurface();
SDLU_SDLRectToMRect( &destSurface->clip_rect, &destBounds );
if( (dPoint->h + width) > destBounds.right || // clipped?
(dPoint->v + height) > destBounds.bottom ||
dPoint->h < destBounds.left ||
dPoint->v < destBounds.top )
{
dPoint->h += width;
return; // do nothing
}
srcRowBytes = font->surface->pitch;
dstRowBytes = destSurface->pitch;
src = (unsigned char*) font->surface->pixels + across;
dst = (unsigned char*) destSurface->pixels + (dPoint->h * BYTES_PER_PIXEL) + (dPoint->v * dstRowBytes);
rgbPremixed = (r << BITS_PER_2CHANNELS) | (g << BITS_PER_1CHANNEL) | b;
switch( dropShadow )
{
case 0:
while( height-- )
{
unsigned char *tSrc = src, *tDst = dst;
for( index=0; index<width; index++ )
{
int workR, workG, workB, work, weightS, weightD;
weightS = *src & CHANNEL_MASK;
if( weightS == CHANNEL_MASK )
{
*(COLOR_T*)dst = rgbPremixed;
}
else if( weightS > 0 )
{
weightD = FULL_WEIGHT - weightS;
work = *(COLOR_T*)dst;
workB = ((((work ) & CHANNEL_MASK) * weightD) + (b * weightS)) >> BITS_PER_1CHANNEL;
workG = ((((work >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weightD) + (g * weightS));
workR = ((((work >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * weightD) + (r * weightS)) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
src++;
dst+=BYTES_PER_PIXEL;
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
}
break;
default:
{
unsigned char *drp = dst + ((dstRowBytes + BYTES_PER_PIXEL) * dropShadow);
while( height-- )
{
unsigned char *tSrc = src, *tDst = dst, *tDrp = drp;
for( index=0; index<width; index++ )
{
int workR, workG, workB, work, weightS, weightD;
weightS = *src & CHANNEL_MASK;
if( weightS == CHANNEL_MASK )
{
*(COLOR_T*)drp = 0;
*(COLOR_T*)dst = rgbPremixed;
}
else if( weightS > 0 )
{
weightD = FULL_WEIGHT - weightS;
work = *(COLOR_T*)drp;
workB = ((((work ) & CHANNEL_MASK) * weightD)) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weightD));
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK) * weightD)) << BITS_PER_1CHANNEL;
*(COLOR_T*)drp = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
work = *(COLOR_T*)dst;
workB = ((((work ) & CHANNEL_MASK) * weightD) + (b * weightS)) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weightD) + (g * weightS));
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK) * weightD) + (r * weightS)) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
src++;
dst+=BYTES_PER_PIXEL;
drp+=BYTES_PER_PIXEL;
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
drp = tDrp + dstRowBytes;
}
break;
}
}
dPoint->h += width;
}
void SurfaceBlitColorOver( SDL_Surface* source, SDL_Surface* dest,
const MRect* sourceRect, const MRect* destRect,
int r, int g, int b, int weight )
{
int startX = 0, startY = 0, endX, endY, x, y, dstRowBytes, srcRowBytes;
unsigned char* src;
unsigned char* dst;
MRect destBounds;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
endX = destRect->right - destRect->left;
endY = destRect->bottom - destRect->top;
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
src = (unsigned char*) source->pixels;
dst = (unsigned char*) dest->pixels;
srcRowBytes = source->pitch;
dstRowBytes = dest->pitch;
src += (sourceRect->top * srcRowBytes) + (sourceRect->left * BYTES_PER_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
src += (srcRowBytes * startY) + (startX * BYTES_PER_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
r *= weight;
g *= weight;
b *= weight;
weight = FULL_WEIGHT - weight;
for( y=startY; y<endY; y++ )
{
unsigned char *tSrc = src, *tDst = dst;
int work, workB, workG, workR;
for( x=startX; x<endX; x++ )
{
work = *(COLOR_T*)src;
workB = ((((work ) & CHANNEL_MASK)*weight) + b) >> BITS_PER_1CHANNEL;
workG = ((((work>>BITS_PER_1CHANNEL ) & CHANNEL_MASK)*weight) + g);
workR = ((((work>>BITS_PER_2CHANNELS) & CHANNEL_MASK)*weight) + r) << BITS_PER_1CHANNEL;
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
src += BYTES_PER_PIXEL;
dst += BYTES_PER_PIXEL;
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
}
}
// NOTE: due to rounding error, there should never be a case of transitioning all the way from 0 to 255.
// You'll overflow and get weird glitches on the edges.
void SurfaceBlitBlendOver(SDL_Surface* source, SDL_Surface* dest,
const MRect* sourceRect, const MRect* destRect,
int r1, int g1, int b1,
int r2, int g2, int b2,
int r3, int g3, int b3,
int r4, int g4, int b4,
int weight )
{
int startX = 0, startY = 0, endX, endY, x, y;
int rA, gA, bA;
int rB, gB, bB;
int rI, gI, bI;
int vrLI, vgLI, vbLI;
int vrRI, vgRI, vbRI;
int weight12, ditherDiff;
int width, height, dstRowBytes, srcRowBytes;
unsigned char *src, *dst;
MRect destBounds;
MBoolean oddX = false;
SDLU_SDLRectToMRect( &dest->clip_rect, &destBounds );
if( destRect->left > destBounds.right || // completely clipped?
destRect->right < destBounds.left ||
destRect->top > destBounds.bottom ||
destRect->bottom < destBounds.top )
{
return; // do nothing
}
endX = destRect->right - destRect->left;
endY = destRect->bottom - destRect->top;
src = (unsigned char*) source->pixels;
dst = (unsigned char*) dest->pixels;
srcRowBytes = source->pitch;
dstRowBytes = dest->pitch;
src += (sourceRect->top * srcRowBytes) + (sourceRect->left * BYTES_PER_PIXEL);
dst += (destRect->top * dstRowBytes) + (destRect->left * BYTES_PER_PIXEL);
if( destRect->left < destBounds.left ) startX -= destRect->left - destBounds.left;
if( destRect->right > destBounds.right ) endX -= destRect->right - destBounds.right;
if( destRect->top < destBounds.top ) startY -= destRect->top - destBounds.top;
if( destRect->bottom > destBounds.bottom ) endY -= destRect->bottom - destBounds.bottom;
src += (srcRowBytes * startY) + (startX * BYTES_PER_PIXEL);
dst += (dstRowBytes * startY) + (startX * BYTES_PER_PIXEL);
height = endY - startY;
width = endX - startX;
weight12 = weight << 12;
r1 *= weight12; g1 *= weight12; b1 *= weight12;
r2 *= weight12; g2 *= weight12; b2 *= weight12;
r3 *= weight12; g3 *= weight12; b3 *= weight12;
r4 *= weight12; g4 *= weight12; b4 *= weight12;
ditherDiff = weight12 >> 1;
vrLI = (r3 - r1) / height;
vgLI = (g3 - g1) / height;
vbLI = (b3 - b1) / height;
vrRI = (r4 - r2) / height;
vgRI = (g4 - g2) / height;
vbRI = (b4 - b2) / height;
weight = FULL_WEIGHT - weight;
weight12 = weight << 12;
if( (endX - startX) & 1 )
{
endX--;
oddX = true;
}
for( y=startY; y<endY; y++ )
{
unsigned char *tSrc = src, *tDst = dst;
int work, workB, workG, workR;
if( y & 1 )
{
rA = r1;
gA = g1;
bA = b1;
rB = r1 - ditherDiff; if( rB < 0 ) rB = 0;
gB = g1 - ditherDiff; if( gB < 0 ) gB = 0;
bB = b1 - ditherDiff; if( bB < 0 ) bB = 0;
}
else
{
rA = r1 - ditherDiff; if( rA < 0 ) rA = 0;
gA = g1 - ditherDiff; if( gA < 0 ) gA = 0;
bA = b1 - ditherDiff; if( bA < 0 ) bA = 0;
rB = r1;
gB = g1;
bB = b1;
}
rI = (2 * (r2 - r1)) / width;
gI = (2 * (g2 - g1)) / width;
bI = (2 * (b2 - b1)) / width;
for( x=startX; x<endX; x+=2 )
{
work = *(COLOR_T*)src;
workB = ((((work ) & CHANNEL_MASK) * weight12) + bA) >> (12 + BITS_PER_1CHANNEL);
workG = ((((work >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weight12) + gA) >> (12 );
workR = ((((work >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * weight12) + rA) >> (12 - BITS_PER_1CHANNEL);
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
src+= BYTES_PER_PIXEL;
dst+= BYTES_PER_PIXEL;
rA += rI;
gA += gI;
bA += bI;
work = *(COLOR_T*)src;
workB = ((((work ) & CHANNEL_MASK) * weight12) + bB) >> (12 + BITS_PER_1CHANNEL);
workG = ((((work >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weight12) + gB) >> (12 );
workR = ((((work >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * weight12) + rB) >> (12 - BITS_PER_1CHANNEL);
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
src+= BYTES_PER_PIXEL;
dst+= BYTES_PER_PIXEL;
rB += rI;
gB += gI;
bB += bI;
}
if( oddX )
{
work = *(COLOR_T*)src;
workB = ((((work ) & CHANNEL_MASK) * weight12) + bA) >> (12 + BITS_PER_1CHANNEL);
workG = ((((work >> BITS_PER_1CHANNEL ) & CHANNEL_MASK) * weight12) + gA) >> (12 );
workR = ((((work >> BITS_PER_2CHANNELS) & CHANNEL_MASK) * weight12) + rA) >> (12 - BITS_PER_1CHANNEL);
*(COLOR_T*)dst = (workR & RED_MASK) | (workG & GREEN_MASK) | (workB & BLUE_MASK);
}
src = tSrc + srcRowBytes;
dst = tDst + dstRowBytes;
r1 += vrLI; r2 += vrRI;
g1 += vgLI; g2 += vgRI;
b1 += vbLI; b2 += vbRI;
}
}