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Clip text surface to texture bounds on fast upload

This commit is contained in:
Jonas Kulla 2013-10-02 21:39:44 +02:00
parent 19c30e3ddd
commit 751b9c3ae5
1 changed files with 54 additions and 7 deletions
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57
src/bitmap.cpp
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@ -819,18 +819,65 @@ void Bitmap::drawText(const IntRect &rect, const char *str, int align)
Vec2i gpTexSize;
gState->ensureTexSize(txtSurf->w, txtSurf->h, gpTexSize);
IntRect drawnRect = posRect;
bool fastBlit = !p->touchesTaintedArea(drawnRect) && txtAlpha == 1.0;
bool fastBlit = !p->touchesTaintedArea(posRect) && txtAlpha == 1.0;
if (fastBlit)
{
if (squeeze == 1.0)
{
/* Even faster: upload directly to bitmap texture */
/* Even faster: upload directly to bitmap texture.
* We have to make sure the posRect lies within the texture
* boundaries or texSubImage will generate errors.
* If it partly lies outside bounds we have to upload
* the clipped visible part of it. */
SDL_Rect btmRect;
btmRect.x = btmRect.y = 0;
btmRect.w = width();
btmRect.h = height();
SDL_Rect txtRect;
txtRect.x = posRect.x;
txtRect.y = posRect.y;
txtRect.w = posRect.w;
txtRect.h = posRect.h;
SDL_Rect inters;
/* If we have no intersection at all,
* there's nothing to upload to begin with */
if (SDL_IntersectRect(&btmRect, &txtRect, &inters))
{
if (inters.w != txtRect.w || inters.h != txtRect.h)
{
/* Clip the text surface */
SDL_PixelFormat *form = txtSurf->format;
SDL_Surface *clip =
SDL_CreateRGBSurface(0, inters.w, inters.h,
form->BitsPerPixel,
form->Rmask,
form->Gmask,
form->Bmask,
form->Amask);
SDL_Rect clipSrc = inters;
clipSrc.x -= txtRect.x;
clipSrc.y -= txtRect.y;
SDL_BlitSurface(txtSurf, &clipSrc, clip, 0);
posRect.x = inters.x;
posRect.y = inters.y;
posRect.w = inters.w;
posRect.h = inters.h;
SDL_FreeSurface(txtSurf);
txtSurf = clip;
}
TEX::bind(p->tex.tex);
TEX::uploadSubImage(posRect.x, posRect.y, posRect.w, posRect.h, txtSurf->pixels, GL_BGRA_EXT);
}
}
else
{
/* Squeezing involved: need to use intermediary TexFBO */
@ -889,7 +936,7 @@ void Bitmap::drawText(const IntRect &rect, const char *str, int align)
}
SDL_FreeSurface(txtSurf);
p->addTaintedArea(drawnRect);
p->addTaintedArea(posRect);
modified();
}