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Fix alpha compositing in ft2font's draw_bitmap.#30043
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f28745c toda6647bCompareActually,#30059 (direct rendering into the Agg buffer) would be even more general than this, as we'd just rely on Agg's compositing. |
The old formula (`*dst |= *src`) works fine when either dst or src isfull transparent or fully opaque, but not for compositing intermediatevalues. Fix that (while keeping a fast-path for the common case ofwriting on an empty buffer).Example (note the more uniform gray zone between the two letters):```from matplotlib import pyplot as plt, ft2font as f, cbookimport numpy as npfont = f.FT2Font(str(cbook._get_data_path("fonts/ttf/DejaVuSans.ttf")))font.set_size(24, 72)im = f.FT2Image(30, 30)ga = font.load_char(ord("A"))gv = font.load_char(ord("V"))font.draw_glyph_to_bitmap(im, 2, 2, ga)font.draw_glyph_to_bitmap(im, 12, 2, gv)(plt.figure(layout="constrained", figsize=(3, 3)) .add_subplot(xticks=[], yticks=[]) .imshow(np.asarray(im), cmap="gray"))plt.show()```Closing in favour of#30059. |
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The old formula (
*dst |= *src) works fine when either dst or src is full transparent or fully opaque, but not for compositing intermediate values. Fix that (while keeping a fast-path for the common case of writing on an empty buffer).Example (note the more uniform gray zone between the two letters):
old/new:
Somewhat unsurprisingly, this also breaks a bunch of baseline images; maybe this could be squashed into the FreeType update (#29816)?
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