We use Cairo to load PNG and SVG files into soy.textures.Texture, however Cairo uses a strange "BGRA" internal storage format which we need to copy into an OpenGL texture for rendering. This is an ideal use of Orc: a src and dst array, nested loops, and copying individual bytes.

Write a new function in Orc to copy the A (Alpha) component, then RGB values multiplied by (255/A) since they're provided with the alpha already applied. This new function should go in libsoy/src/textures/Texture.orc and then get called from libsoy/src/textures/Texture.gs within the _copySurface method for RGBA surfaces.

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When you've done, commit your work and post the resulting changeset url to this task.