refactor(new_editor): unify d3d12 text run caching

new_editor/app/Rendering/D3D12/D3D12UiTextSystem.cpp

@@ -224,10 +224,13 @@ void CompositeCoverage(
             const std::size_t srcOffset =
                 static_cast<std::size_t>(row) * textureStride +
                 static_cast<std::size_t>(column) * channelCount;
-            std::uint8_t coverage = 0u;
+            std::uint32_t coverageSum = 0u;
             for (std::size_t channel = 0u; channel < channelCount; ++channel) {
-                coverage = (std::max)(coverage, alphaTexture[srcOffset + channel]);
+                coverageSum += static_cast<std::uint32_t>(alphaTexture[srcOffset + channel]);
             }
+            const std::uint8_t coverage = static_cast<std::uint8_t>(
+                (coverageSum + static_cast<std::uint32_t>(channelCount / 2u)) /
+                static_cast<std::uint32_t>(channelCount));
 
             if (coverage == 0u) {
                 continue;
@@ -533,13 +536,9 @@ float D3D12UiTextSystem::MeasureTextWidth(
 bool D3D12UiTextSystem::RasterizeTextMask(
     std::string_view text,
     float fontSize,
-    std::vector<std::uint8_t>& outRgbaPixels,
-    UINT& outWidth,
-    UINT& outHeight,
+    RasterizedTextRun& outRun,
     std::string& outError) {
-    outRgbaPixels.clear();
-    outWidth = 0u;
-    outHeight = 0u;
+    outRun = {};
     outError.clear();
 
     if (!m_dwriteFactory) {
@@ -593,16 +592,18 @@ bool D3D12UiTextSystem::RasterizeTextMask(
     const float topPad = (std::max)(overhangMetrics.top, 0.0f);
     const float rightPad = (std::max)(overhangMetrics.right, 0.0f);
     const float bottomPad = (std::max)(overhangMetrics.bottom, 0.0f);
-    outWidth = (std::max)(
+    outRun.width = (std::max)(
         1u,
         static_cast<UINT>(std::ceil(
             textMetrics.widthIncludingTrailingWhitespace + leftPad + rightPad)));
-    outHeight = (std::max)(
+    outRun.height = (std::max)(
         1u,
         static_cast<UINT>(std::ceil(
             (std::max)(textMetrics.height, scaledFontSize * 1.6f) + topPad + bottomPad)));
-    outRgbaPixels.assign(
-        static_cast<std::size_t>(outWidth) * static_cast<std::size_t>(outHeight) * 4u,
+    outRun.offsetX = -leftPad;
+    outRun.offsetY = -topPad;
+    outRun.rgbaPixels.assign(
+        static_cast<std::size_t>(outRun.width) * static_cast<std::size_t>(outRun.height) * 4u,
         0u);
 
     GlyphRunCollector* collector = new GlyphRunCollector(dpiScale);
@@ -675,9 +676,9 @@ bool D3D12UiTextSystem::RasterizeTextMask(
         }
 
         CompositeCoverage(
-            outRgbaPixels,
-            outWidth,
-            outHeight,
+            outRun.rgbaPixels,
+            outRun.width,
+            outRun.height,
             bounds,
             alphaTexture.data(),
             static_cast<std::size_t>(boundsWidth) * 3u,