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feat: render placeholders while waiting for images to render (#1003)

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This commit is contained in:
Matthías Páll Gissurarson
2026-07-12 21:40:07 +03:00
committed by GitHub
parent 444d87de82
commit 39ea4b045f
5 changed files with 125 additions and 10 deletions
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lib/Epub/Epub/Page.h
+9
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@@ -50,6 +50,7 @@ class PageImage final : public PageElement {
PageImage(std::shared_ptr<ImageBlock> block, const int16_t xPos, const int16_t yPos)
: PageElement(xPos, yPos), imageBlock(std::move(block)) {}
void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) override;
void renderPlaceholder(GfxRenderer& renderer, int xOffset, int yOffset) const;
bool serialize(HalFile& file) override;
PageElementTag getTag() const override { return TAG_PageImage; }
static std::unique_ptr<PageImage> deserialize(HalFile& file);
@@ -89,6 +90,7 @@ class Page {
void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) const;
void renderImages(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) const;
void renderWithImagePlaceholders(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) const;
bool serialize(HalFile& file) const;
static std::unique_ptr<Page> deserialize(HalFile& file);
@@ -98,6 +100,13 @@ class Page {
[](const std::shared_ptr<PageElement>& el) { return el->getTag() == TAG_PageImage; });
}
bool hasImagesNeedingDecode() const {
return std::any_of(elements.begin(), elements.end(), [](const std::shared_ptr<PageElement>& element) {
return element->getTag() == TAG_PageImage &&
static_cast<const PageImage&>(*element).getImageBlock().needsDecode();
});
}
// Get bounding box of all images on the page (union of image rects)
// Returns false if no images. Coordinates are relative to page origin.
bool getImageBoundingBox(int16_t& outX, int16_t& outY, int16_t& outW, int16_t& outH) const {