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[Impeller] Respect max supported texture size when allocating glyph atlas texture. #45992

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Sep 18, 2023
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[Impeller] Respect max supported texture size when allocating glyph atlas texture. #45992

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17 changes: 11 additions & 6 deletions impeller/typographer/backends/skia/typographer_context_skia.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -117,10 +117,10 @@ static ISize OptimumAtlasSizeForFontGlyphPairs(
const std::vector<FontGlyphPair>& pairs,
std::vector<Rect>& glyph_positions,
const std::shared_ptr<GlyphAtlasContext>& atlas_context,
GlyphAtlas::Type type) {
GlyphAtlas::Type type,
const ISize& max_texture_size) {
static constexpr auto kMinAtlasSize = 8u;
static constexpr auto kMinAlphaBitmapSize = 1024u;
static constexpr auto kMaxAtlasSize = 4096u;

TRACE_EVENT0("impeller", __FUNCTION__);

Expand All @@ -147,8 +147,8 @@ static ISize OptimumAtlasSizeForFontGlyphPairs(
Allocation::NextPowerOfTwoSize(current_size.width + 1),
Allocation::NextPowerOfTwoSize(current_size.height + 1));
}
} while (current_size.width <= kMaxAtlasSize &&
current_size.height <= kMaxAtlasSize);
} while (current_size.width <= max_texture_size.width &&
current_size.height <= max_texture_size.height);
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@bdero bdero Sep 18, 2023

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Can you also add this change to the STB backend? It's similarly pinned to an arbitrary texture size.

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@chinmaygarde chinmaygarde Sep 18, 2023

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Oh, my bad. Didn't notice this call to action. Filing a followup.

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@chinmaygarde chinmaygarde Sep 18, 2023

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Filed #46010

return ISize{0, 0};
}

Expand Down Expand Up @@ -366,7 +366,7 @@ std::shared_ptr<GlyphAtlas> TypographerContextSkia::CreateGlyphAtlas(

// ---------------------------------------------------------------------------
// Step 3a: Record the positions in the glyph atlas of the newly added
// glyphs.
// glyphs.
// ---------------------------------------------------------------------------
for (size_t i = 0, count = glyph_positions.size(); i < count; i++) {
last_atlas->AddTypefaceGlyphPosition(new_glyphs[i], glyph_positions[i]);
Expand Down Expand Up @@ -405,7 +405,12 @@ std::shared_ptr<GlyphAtlas> TypographerContextSkia::CreateGlyphAtlas(
}
auto glyph_atlas = std::make_shared<GlyphAtlas>(type);
auto atlas_size = OptimumAtlasSizeForFontGlyphPairs(
font_glyph_pairs, glyph_positions, atlas_context, type);
font_glyph_pairs, //
glyph_positions, //
atlas_context, //
type, //
context.GetResourceAllocator()->GetMaxTextureSizeSupported() //
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@bdero bdero Sep 18, 2023

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Oh nice, I didn't realize we had this yet.

);

atlas_context->UpdateGlyphAtlas(glyph_atlas, atlas_size);
if (atlas_size.IsEmpty()) {
Expand Down