The code was refactored moving the BlenderHelper class from "render"
to "doc", and now doc::blend_image() supports blending different color
modes.
Some work is still needed to work with grayscale images correctly.
This patch solves several problems introducing the possibility to
specify a row stride bigger than the width (visible pixels) on each
image row. Useful in case that we want to align the initial pixel
address of each row (if DOC_USE_ALIGNED_PIXELS is defined).
This allows us to use some SIMD intrinsics (e.g. SSE2) for some image
functions in the future (right now implemented only in the new
is_same_image_simd_templ() for is_same_image()).
Anyway to avoid breaking some existing code, by default we'll still
keep the old behavior: row stride bytes = width bytes (so
DOC_USE_ALIGNED_PIXELS is undefined).
We can use:
Image:clear()
Image:clear(color)
Image:clear(rectangle)
Image:clear(rectangle, color)
If the color is not specified it will be the transparent color of the
image.
Co-authored-by: David Capello <david@igara.com>
