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SWORD25: Make full transparency check earlier

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svn-id: r53352
This commit is contained in:
Eugene Sandulenko 2010-09-14 12:00:26 +00:00
parent 5c228cea0b
commit d5ec19960d
1 changed files with 21 additions and 14 deletions
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35
engines/sword25/gfx/opengl/glimage.cpp
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@ -170,6 +170,24 @@ uint GLImage::getPixel(int x, int y) {
// -----------------------------------------------------------------------------
bool GLImage::blit(int posX, int posY, int flipping, Common::Rect *pPartRect, uint color, int width, int height) {
int ca = (color >> 24) & 0xff;
// Check if we need to draw anything at all
if (ca == 0)
return true;
int cr = (color >> 16) & 0xff;
int cg = (color >> 8) & 0xff;
int cb = (color >> 0) & 0xff;
// Compensate for transparency. Since we're coming
// down to 255 alpha, we just compensate for the colors here
if (ca != 255) {
cr = cr * ca >> 8;
cg = cg * ca >> 8;
cb = cb * ca >> 8;
}
// Create an encapsulating surface for the data
Graphics::Surface srcImage;
srcImage.bytesPerPixel = 4;
@ -213,17 +231,6 @@ bool GLImage::blit(int posX, int posY, int flipping, Common::Rect *pPartRect, ui
img = &srcImage;
}
int ca = (color >> 24) & 0xff;
int cr = (color >> 16) & 0xff;
int cg = (color >> 8) & 0xff;
int cb = (color >> 0) & 0xff;
if (ca != 255) {
cr = cr * ca >> 8;
cg = cg * ca >> 8;
cb = cb * ca >> 8;
}
// Handle off-screen clipping
if (posY < 0) {
img->h = MAX(0, (int)img->h - -posY);
@ -240,7 +247,7 @@ bool GLImage::blit(int posX, int posY, int flipping, Common::Rect *pPartRect, ui
img->w = CLIP((int)img->w, 0, (int)MAX((int)_backSurface->w - posX, 0));
img->h = CLIP((int)img->h, 0, (int)MAX((int)_backSurface->h - posY, 0));
if ((ca != 0) && (img->w > 0) && (img->h > 0)) {
if ((img->w > 0) && (img->h > 0)) {
int xp = 0, yp = 0;
int inStep = 4;
@ -344,11 +351,11 @@ Graphics::Surface *GLImage::scale(const Graphics::Surface &srcImage, int xSize,
// Loop to create scaled version
for (int yp = 0; yp < ySize; ++yp) {
byte *srcP = (byte *)srcImage.getBasePtr(0, vertUsage[yp]);
const byte *srcP = (const byte *)srcImage.getBasePtr(0, vertUsage[yp]);
byte *destP = (byte *)s->getBasePtr(0, yp);
for (int xp = 0; xp < xSize; ++xp) {
byte *tempSrcP = srcP + (horizUsage[xp] * srcImage.bytesPerPixel);
const byte *tempSrcP = srcP + (horizUsage[xp] * srcImage.bytesPerPixel);
for (int byteCtr = 0; byteCtr < srcImage.bytesPerPixel; ++byteCtr) {
*destP++ = *tempSrcP++;
}