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LibPDF: If softmask has different size than target bitmap, resize it

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Size of smask and image aren't guaranteed to be equal by the spec
(...except for /Matte, see page 555 of the PDF 1.7 spec, but we
don't implement that), and in pratice they sometimes aren't.

Fixes an assert on page 4 of
https://devstreaming-cdn.apple.com/videos/wwdc/2017/821kjtggolzxsv/821/821_get_started_with_display_p3.pdf
We now make it all the way to page 43 of 64 before crashing.
This commit is contained in:
Nico Weber 2023-10-18 10:57:41 -04:00 • committed by Sam Atkins
parent a4dec92ed0
commit 3c2d820391
1 changed files with 6 additions and 1 deletions
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7
Userland/Libraries/LibPDF/Renderer.cpp
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@ -892,7 +892,12 @@ PDFErrorOr<void> Renderer::show_image(NonnullRefPtr<StreamObject> image)
auto image_bitmap = TRY(load_image(image));
if (image_dict->contains(CommonNames::SMask)) {
auto smask_bitmap = TRY(load_image(TRY(image_dict->get_stream(m_document, CommonNames::SMask))));
VERIFY(smask_bitmap->rect() == image_bitmap->rect());
// Make softmask same size as image.
// FIXME: The smask code here is fairly ad-hoc and incomplete.
if (smask_bitmap->size() != image_bitmap->size())
smask_bitmap = TRY(smask_bitmap->scaled_to_size(image_bitmap->size()));
for (int j = 0; j < image_bitmap->height(); ++j) {
for (int i = 0; i < image_bitmap->width(); ++i) {
auto image_color = image_bitmap->get_pixel(i, j);