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tacaswelltacaswell
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patch to fix issue matplotlib#2473.
The change to the agg propagate to how `imsave` works so one test had to be changed to account for the fact that pixels with alpha=0 are now set to (1, 1, 1, 0) instead of (0, 0, 0, 0).
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Lines changed: 3 additions & 2 deletions

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‎lib/matplotlib/tests/test_image.py‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -147,7 +147,8 @@ def test_imsave_color_alpha():
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# Wherever alpha values were rounded down to 0, the rgb values all get set
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# to 0 during imsave (this is reasonable behaviour).
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# Recreate that here:
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data[data[:, :, 3] == 0] = 0
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for j in range(3):
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data[data[:, :, 3] == 0, j] = 1
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assert_array_equal(data, arr_buf)
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‎src/_backend_agg.cpp‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -430,7 +430,7 @@ RendererAgg::RendererAgg(unsigned int width, unsigned int height, double dpi,
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renderingBuffer.attach(pixBuffer, width, height, stride);
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pixFmt.attach(renderingBuffer);
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rendererBase.attach(pixFmt);
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rendererBase.clear(agg::rgba(0, 0, 0, 0));
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rendererBase.clear(agg::rgba(1, 1, 1, 0));
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rendererAA.attach(rendererBase);
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rendererBin.attach(rendererBase);
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hatchRenderingBuffer.attach(hatchBuffer, HATCH_SIZE, HATCH_SIZE,

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