void GLBlitTextureImageHelper::BlitTextureImage(TextureImage *aSrc, const nsIntRect& aSrcRect, TextureImage *aDst, const nsIntRect& aDstRect) { GLContext *gl = mCompositor->gl(); NS_ASSERTION(!aSrc->InUpdate(), "Source texture is in update!"); NS_ASSERTION(!aDst->InUpdate(), "Destination texture is in update!"); if (!aSrc || !aDst || aSrcRect.IsEmpty() || aDstRect.IsEmpty()) return; int savedFb = 0; gl->fGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &savedFb); ScopedGLState scopedScissorTestState(gl, LOCAL_GL_SCISSOR_TEST, false); ScopedGLState scopedBlendState(gl, LOCAL_GL_BLEND, false); // 2.0 means scale up by two float blitScaleX = float(aDstRect.width) / float(aSrcRect.width); float blitScaleY = float(aDstRect.height) / float(aSrcRect.height); // We start iterating over all destination tiles aDst->BeginBigImageIteration(); do { // calculate portion of the tile that is going to be painted to nsIntRect dstSubRect; nsIntRect dstTextureRect = ThebesIntRect(aDst->GetTileRect()); dstSubRect.IntersectRect(aDstRect, dstTextureRect); // this tile is not part of the destination rectangle aDstRect if (dstSubRect.IsEmpty()) continue; // (*) transform the rect of this tile into the rectangle defined by aSrcRect... nsIntRect dstInSrcRect(dstSubRect); dstInSrcRect.MoveBy(-aDstRect.TopLeft()); // ...which might be of different size, hence scale accordingly dstInSrcRect.ScaleRoundOut(1.0f / blitScaleX, 1.0f / blitScaleY); dstInSrcRect.MoveBy(aSrcRect.TopLeft()); SetBlitFramebufferForDestTexture(aDst->GetTextureID()); UseBlitProgram(); aSrc->BeginBigImageIteration(); // now iterate over all tiles in the source Image... do { // calculate portion of the source tile that is in the source rect nsIntRect srcSubRect; nsIntRect srcTextureRect = ThebesIntRect(aSrc->GetTileRect()); srcSubRect.IntersectRect(aSrcRect, srcTextureRect); // this tile is not part of the source rect if (srcSubRect.IsEmpty()) { continue; } // calculate intersection of source rect with destination rect srcSubRect.IntersectRect(srcSubRect, dstInSrcRect); // this tile does not overlap the current destination tile if (srcSubRect.IsEmpty()) { continue; } // We now have the intersection of // the current source tile // and the desired source rectangle // and the destination tile // and the desired destination rectange // in destination space. // We need to transform this back into destination space, inverting the transform from (*) nsIntRect srcSubInDstRect(srcSubRect); srcSubInDstRect.MoveBy(-aSrcRect.TopLeft()); srcSubInDstRect.ScaleRoundOut(blitScaleX, blitScaleY); srcSubInDstRect.MoveBy(aDstRect.TopLeft()); // we transform these rectangles to be relative to the current src and dst tiles, respectively nsIntSize srcSize = srcTextureRect.Size(); nsIntSize dstSize = dstTextureRect.Size(); srcSubRect.MoveBy(-srcTextureRect.x, -srcTextureRect.y); srcSubInDstRect.MoveBy(-dstTextureRect.x, -dstTextureRect.y); float dx0 = 2.0f * float(srcSubInDstRect.x) / float(dstSize.width) - 1.0f; float dy0 = 2.0f * float(srcSubInDstRect.y) / float(dstSize.height) - 1.0f; float dx1 = 2.0f * float(srcSubInDstRect.x + srcSubInDstRect.width) / float(dstSize.width) - 1.0f; float dy1 = 2.0f * float(srcSubInDstRect.y + srcSubInDstRect.height) / float(dstSize.height) - 1.0f; ScopedViewportRect autoViewportRect(gl, 0, 0, dstSize.width, dstSize.height); RectTriangles rects; nsIntSize realTexSize = srcSize; if (!CanUploadNonPowerOfTwo(gl)) { realTexSize = nsIntSize(gfx::NextPowerOfTwo(srcSize.width), gfx::NextPowerOfTwo(srcSize.height)); } if (aSrc->GetWrapMode() == LOCAL_GL_REPEAT) { rects.addRect(/* dest rectangle */ dx0, dy0, dx1, dy1, /* tex coords */ srcSubRect.x / float(realTexSize.width), srcSubRect.y / float(realTexSize.height), srcSubRect.XMost() / float(realTexSize.width), srcSubRect.YMost() / float(realTexSize.height)); } else { DecomposeIntoNoRepeatTriangles(srcSubRect, realTexSize, rects); // now put the coords into the d[xy]0 .. d[xy]1 coordinate space // from the 0..1 that it comes out of decompose InfallibleTArray<RectTriangles::coord>& coords = rects.vertCoords(); for (unsigned int i = 0; i < coords.Length(); ++i) { coords[i].x = (coords[i].x * (dx1 - dx0)) + dx0; coords[i].y = (coords[i].y * (dy1 - dy0)) + dy0; } } ScopedBindTextureUnit autoTexUnit(gl, LOCAL_GL_TEXTURE0); ScopedBindTexture autoTex(gl, aSrc->GetTextureID()); ScopedVertexAttribPointer autoAttrib0(gl, 0, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, 0, rects.vertCoords().Elements()); ScopedVertexAttribPointer autoAttrib1(gl, 1, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, 0, rects.texCoords().Elements()); gl->fDrawArrays(LOCAL_GL_TRIANGLES, 0, rects.elements()); } while (aSrc->NextTile()); } while (aDst->NextTile()); // unbind the previous texture from the framebuffer SetBlitFramebufferForDestTexture(0); gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, savedFb); }
static void TexImage2DHelper(GLContext *gl, GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei stride, GLint pixelsize, GLint border, GLenum format, GLenum type, const GLvoid *pixels) { if (gl->IsGLES2()) { NS_ASSERTION(format == (GLenum)internalformat, "format and internalformat not the same for glTexImage2D on GLES2"); if (!CanUploadNonPowerOfTwo(gl) && (stride != width * pixelsize || !gfx::IsPowerOfTwo(width) || !gfx::IsPowerOfTwo(height))) { // Pad out texture width and height to the next power of two // as we don't support/want non power of two texture uploads GLsizei paddedWidth = gfx::NextPowerOfTwo(width); GLsizei paddedHeight = gfx::NextPowerOfTwo(height); GLvoid* paddedPixels = new unsigned char[paddedWidth * paddedHeight * pixelsize]; // Pad out texture data to be in a POT sized buffer for uploading to // a POT sized texture CopyAndPadTextureData(pixels, paddedPixels, width, height, paddedWidth, paddedHeight, stride, pixelsize); gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, std::min(GetAddressAlignment((ptrdiff_t)paddedPixels), GetAddressAlignment((ptrdiff_t)paddedWidth * pixelsize))); gl->fTexImage2D(target, border, internalformat, paddedWidth, paddedHeight, border, format, type, paddedPixels); gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, 4); delete[] static_cast<unsigned char*>(paddedPixels); return; } if (stride == width * pixelsize) { gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, std::min(GetAddressAlignment((ptrdiff_t)pixels), GetAddressAlignment((ptrdiff_t)stride))); gl->fTexImage2D(target, border, internalformat, width, height, border, format, type, pixels); gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, 4); } else { // Use GLES-specific workarounds for GL_UNPACK_ROW_LENGTH; these are // implemented in TexSubImage2D. gl->fTexImage2D(target, border, internalformat, width, height, border, format, type, nullptr); TexSubImage2DHelper(gl, target, level, 0, 0, width, height, stride, pixelsize, format, type, pixels); } } else { // desktop GL (non-ES) path gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, std::min(GetAddressAlignment((ptrdiff_t)pixels), GetAddressAlignment((ptrdiff_t)stride))); int rowLength = stride/pixelsize; gl->fPixelStorei(LOCAL_GL_UNPACK_ROW_LENGTH, rowLength); gl->fTexImage2D(target, level, internalformat, width, height, border, format, type, pixels); gl->fPixelStorei(LOCAL_GL_UNPACK_ROW_LENGTH, 0); gl->fPixelStorei(LOCAL_GL_UNPACK_ALIGNMENT, 4); } }