[Impeller] invalidate cached atlas data, take 2. (flutter/engine#56925)

Fixes https://github.com/flutter/flutter/issues/159704, but for real this time.

engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.cc

@@ -5,6 +5,7 @@
 #include "impeller/typographer/backends/skia/typographer_context_skia.h"
 
 #include <cstddef>
+#include <cstdint>
 #include <memory>
 #include <numeric>
 #include <utility>
@@ -414,14 +415,17 @@ TypographerContextSkia::CollectNewGlyphs(
   std::vector<FontGlyphPair> new_glyphs;
   std::vector<Rect> glyph_sizes;
   size_t generation_id = atlas->GetAtlasGeneration();
+  intptr_t atlas_id = reinterpret_cast<intptr_t>(atlas.get());
   for (const auto& frame : text_frames) {
+    auto [frame_generation_id, frame_atlas_id] =
+        frame->GetAtlasGenerationAndID();
     if (atlas->IsValid() && frame->IsFrameComplete() &&
-        frame->GetAtlasGeneration() == generation_id &&
+        frame_generation_id == generation_id && frame_atlas_id == atlas_id &&
         !frame->GetFrameBounds(0).is_placeholder) {
       continue;
     }
     frame->ClearFrameBounds();
-    frame->SetAtlasGeneration(generation_id);
+    frame->SetAtlasGeneration(generation_id, atlas_id);
 
     for (const auto& run : frame->GetRuns()) {
       auto metrics = run.GetFont().GetMetrics();

engine/src/flutter/impeller/typographer/text_frame.cc

@@ -144,12 +144,13 @@ const FrameBounds& TextFrame::GetFrameBounds(size_t index) const {
   return bound_values_[index];
 }
 
-size_t TextFrame::GetAtlasGeneration() const {
-  return generation_;
+std::pair<size_t, intptr_t> TextFrame::GetAtlasGenerationAndID() const {
+  return std::make_pair(generation_, atlas_id_);
 }
 
-void TextFrame::SetAtlasGeneration(size_t value) {
+void TextFrame::SetAtlasGeneration(size_t value, intptr_t atlas_id) {
   generation_ = value;
+  atlas_id_ = atlas_id;
 }
 
 }  // namespace impeller

engine/src/flutter/impeller/typographer/text_frame.h

@@ -5,6 +5,7 @@
 #ifndef FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_FRAME_H_
 #define FLUTTER_IMPELLER_TYPOGRAPHER_TEXT_FRAME_H_
 
+#include <cstdint>
 #include "impeller/typographer/glyph_atlas.h"
 #include "impeller/typographer/text_run.h"
 
@@ -88,7 +89,7 @@ class TextFrame {
   // with. As long as the frame generation matches the atlas generation,
   // the contents are guaranteed to be populated and do not need to be
   // processed.
-  size_t GetAtlasGeneration() const;
+  std::pair<size_t, intptr_t> GetAtlasGenerationAndID() const;
 
   TextFrame& operator=(TextFrame&& other) = default;
 
@@ -108,7 +109,7 @@ class TextFrame {
 
   void ClearFrameBounds();
 
-  void SetAtlasGeneration(size_t value);
+  void SetAtlasGeneration(size_t value, intptr_t atlas_id);
 
   std::vector<TextRun> runs_;
   Rect bounds_;
@@ -119,6 +120,7 @@ class TextFrame {
   std::vector<FrameBounds> bound_values_;
   Scalar scale_ = 0;
   size_t generation_ = 0;
+  intptr_t atlas_id_ = 0;
   Point offset_;
   std::optional<GlyphProperties> properties_;
 };

engine/src/flutter/impeller/typographer/typographer_unittests.cc

@@ -585,9 +585,9 @@ TEST_P(TypographerTest, TextFrameAtlasGenerationTracksState) {
   EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
   if (GetBackend() == PlaygroundBackend::kOpenGLES) {
     // OpenGLES must always increase the atlas backend if the texture grows.
-    EXPECT_EQ(frame->GetAtlasGeneration(), 1u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
   } else {
-    EXPECT_EQ(frame->GetAtlasGeneration(), 0u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
   }
 
   atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
@@ -598,9 +598,9 @@ TEST_P(TypographerTest, TextFrameAtlasGenerationTracksState) {
   EXPECT_TRUE(frame->IsFrameComplete());
   EXPECT_FALSE(frame->GetFrameBounds(0).is_placeholder);
   if (GetBackend() == PlaygroundBackend::kOpenGLES) {
-    EXPECT_EQ(frame->GetAtlasGeneration(), 1u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
   } else {
-    EXPECT_EQ(frame->GetAtlasGeneration(), 0u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
   }
 
   // Force increase the generation.
@@ -609,7 +609,7 @@ TEST_P(TypographerTest, TextFrameAtlasGenerationTracksState) {
                            GlyphAtlas::Type::kAlphaBitmap, /*scale=*/1.0f,
                            atlas_context, frame);
 
-  EXPECT_EQ(frame->GetAtlasGeneration(), 2u);
+  EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 2u);
 }
 
 TEST_P(TypographerTest, InvalidAtlasForcesRepopulation) {
@@ -637,9 +637,9 @@ TEST_P(TypographerTest, InvalidAtlasForcesRepopulation) {
   EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
   if (GetBackend() == PlaygroundBackend::kOpenGLES) {
     // OpenGLES must always increase the atlas backend if the texture grows.
-    EXPECT_EQ(frame->GetAtlasGeneration(), 1u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
   } else {
-    EXPECT_EQ(frame->GetAtlasGeneration(), 0u);
+    EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
   }
 
   auto second_context = TypographerContextSkia::Make();