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LibWeb+LibGfx: Implement Canvas2D filters

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This commit is contained in:
Lucien Fiorini 2024-12-18 12:26:37 +01:00 • committed by Alexander Kalenik
commit a6ef6550f3
Notes: github-actions[bot] 2024-12-18 17:55:41 +00:00
10 changed files with 136 additions and 31 deletions
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6
Libraries/LibGfx/ImageFormats/PNGLoader.cpp
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@ -257,11 +257,11 @@ ErrorOr<size_t> PNGLoadingContext::read_frames(png_structp png_ptr, png_infop in
case PNG_BLEND_OP_SOURCE:
// All color components of the frame, including alpha, overwrite the current contents of the frame's output buffer region.
painter->clear_rect(frame_rect, Gfx::Color::Transparent);
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*decoded_frame_bitmap), decoded_frame_bitmap->rect(), Gfx::ScalingMode::NearestNeighbor, 1.0f);
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*decoded_frame_bitmap), decoded_frame_bitmap->rect(), Gfx::ScalingMode::NearestNeighbor, {}, 1.0f);
break;
case PNG_BLEND_OP_OVER:
// The frame should be composited onto the output buffer based on its alpha, using a simple OVER operation as described in the "Alpha Channel Processing" section of the PNG specification.
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*decoded_frame_bitmap), decoded_frame_bitmap->rect(), ScalingMode::NearestNeighbor, 1.0f);
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*decoded_frame_bitmap), decoded_frame_bitmap->rect(), ScalingMode::NearestNeighbor, {}, 1.0f);
break;
default:
VERIFY_NOT_REACHED();
@ -280,7 +280,7 @@ ErrorOr<size_t> PNGLoadingContext::read_frames(png_structp png_ptr, png_infop in
case PNG_DISPOSE_OP_PREVIOUS:
// The frame's region of the output buffer is to be reverted to the previous contents before rendering the next frame.
painter->clear_rect(frame_rect, Gfx::Color::Transparent);
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*prev_output_buffer), IntRect { x, y, width, height }, Gfx::ScalingMode::NearestNeighbor, 1.0f);
painter->draw_bitmap(frame_rect, Gfx::ImmutableBitmap::create(*prev_output_buffer), IntRect { x, y, width, height }, Gfx::ScalingMode::NearestNeighbor, {}, 1.0f);
break;
default:
VERIFY_NOT_REACHED();