Maintain hierarchical structure of sprite groups instead of flattening.
Allows opacity and blend mode to be applied correctly to groups.
Sets the foundation for future features like mask layers.
Note:
Requires full image rendering and impacts performance in some scenarios.
Avoids complex code changes for minor performance gains.
Co-authored-by: Guilherme Marcondes <guilherme.marcondes@tecnico.ulisboa.pt>
The SimpleRenderer outputs unpremultiplied RGB values when we render
in a transparent background, we have to indicate that to Skia now that
we're compositing os::Surfaces (SkiaSurfaces) directly in this
FullscreenPreview command.
Renderer::renderCheckeredBackground() function was used only for the
FullscreenPreviewCommand, but now we use
ShaderRenderer::renderCheckeredBackground() to render the background
in the Editor too. So the sprite is painted in a backbuffer and then
composited with the already painted background using
Graphics::drawSurface().
This new renderer uses a shader to paint only the checkered
background. It can be tested only in ENABLE_DEVMODE and pressing F1
key to switch between the renderers (which is a devmode special key
for testing purposes only)
We've changed the Renderer::renderSprite(Image*, ...) member function
to renderSprite(os::Surface*, ...) so we receive the os::Surface
directly to paint the SkCanvas with a SkShader. Probably more
refactors will be needed.
