1 files changed, 183 insertions, 0 deletions
diff --git a/widget/ThemeDrawing.cpp b/widget/ThemeDrawing.cpp
new file mode 100644
index 0000000000..93e317a41b
--- /dev/null
+++ b/widget/ThemeDrawing.cpp
@@ -0,0 +1,183 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ThemeDrawing.h"
+
+namespace mozilla::widget {
+
+/*static*/
+void ThemeDrawing::FillRect(DrawTarget& aDt, const LayoutDeviceRect& aRect,
+                            const sRGBColor& aColor) {
+  aDt.FillRect(aRect.ToUnknownRect(), gfx::ColorPattern(ToDeviceColor(aColor)));
+}
+
+/*static*/
+void ThemeDrawing::FillRect(WebRenderBackendData& aWrData,
+                            const LayoutDeviceRect& aRect,
+                            const sRGBColor& aColor) {
+  const bool kBackfaceIsVisible = true;
+  auto dest = wr::ToLayoutRect(aRect);
+  aWrData.mBuilder.PushRect(dest, dest, kBackfaceIsVisible, false, false,
+                            wr::ToColorF(ToDeviceColor(aColor)));
+}
+
+/*static*/
+LayoutDeviceIntCoord ThemeDrawing::SnapBorderWidth(const CSSCoord& aCssWidth,
+                                                   const DPIRatio& aDpiRatio) {
+  if (aCssWidth == 0.0f) {
+    return 0;
+  }
+  return std::max(LayoutDeviceIntCoord(1), (aCssWidth * aDpiRatio).Truncated());
+}
+
+/*static*/
+void ThemeDrawing::PaintArrow(DrawTarget& aDrawTarget,
+                              const LayoutDeviceRect& aRect,
+                              const float aArrowPolygonX[],
+                              const float aArrowPolygonY[],
+                              const float aArrowPolygonSize,
+                              const int32_t aArrowNumPoints,
+                              const sRGBColor aFillColor) {
+  const float scale = ScaleToFillRect(aRect, aArrowPolygonSize);
+
+  auto center = aRect.Center().ToUnknownPoint();
+
+  RefPtr<gfx::PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+  gfx::Point p =
+      center + gfx::Point(aArrowPolygonX[0] * scale, aArrowPolygonY[0] * scale);
+  builder->MoveTo(p);
+  for (int32_t i = 1; i < aArrowNumPoints; i++) {
+    p = center +
+        gfx::Point(aArrowPolygonX[i] * scale, aArrowPolygonY[i] * scale);
+    builder->LineTo(p);
+  }
+  RefPtr<gfx::Path> path = builder->Finish();
+
+  aDrawTarget.Fill(path, gfx::ColorPattern(ToDeviceColor(aFillColor)));
+}
+
+void ThemeDrawing::PaintRoundedRectWithRadius(
+    WebRenderBackendData& aWrData, const LayoutDeviceRect& aRect,
+    const LayoutDeviceRect& aClipRect, const sRGBColor& aBackgroundColor,
+    const sRGBColor& aBorderColor, const CSSCoord& aBorderWidth,
+    const CSSCoord& aRadius, const DPIRatio& aDpiRatio) {
+  const bool kBackfaceIsVisible = true;
+  const LayoutDeviceCoord borderWidth(SnapBorderWidth(aBorderWidth, aDpiRatio));
+  const LayoutDeviceCoord radius(aRadius * aDpiRatio);
+  const wr::LayoutRect dest = wr::ToLayoutRect(aRect);
+  const wr::LayoutRect clip = wr::ToLayoutRect(aClipRect);
+
+  // Push the background.
+  if (aBackgroundColor.a != 0.0f) {
+    auto backgroundColor = wr::ToColorF(ToDeviceColor(aBackgroundColor));
+    wr::LayoutRect backgroundRect = [&] {
+      LayoutDeviceRect bg = aRect;
+      bg.Deflate(borderWidth);
+      return wr::ToLayoutRect(bg);
+    }();
+    if (radius == 0.0f) {
+      aWrData.mBuilder.PushRect(backgroundRect, clip, kBackfaceIsVisible, false,
+                                false, backgroundColor);
+    } else {
+      // NOTE(emilio): This follows DisplayListBuilder::PushRoundedRect and
+      // draws the rounded fill as an extra thick rounded border instead of a
+      // rectangle that's clipped to a rounded clip. Refer to that method for a
+      // justification. See bug 1694269.
+      LayoutDeviceCoord backgroundRadius =
+          std::max(0.0f, float(radius) - float(borderWidth));
+      wr::BorderSide side = {backgroundColor, wr::BorderStyle::Solid};
+      const wr::BorderSide sides[4] = {side, side, side, side};
+      float h = backgroundRect.width() * 0.6f;
+      float v = backgroundRect.height() * 0.6f;
+      wr::LayoutSideOffsets widths = {v, h, v, h};
+      wr::BorderRadius radii = {{backgroundRadius, backgroundRadius},
+                                {backgroundRadius, backgroundRadius},
+                                {backgroundRadius, backgroundRadius},
+                                {backgroundRadius, backgroundRadius}};
+      aWrData.mBuilder.PushBorder(backgroundRect, clip, kBackfaceIsVisible,
+                                  widths, {sides, 4}, radii);
+    }
+  }
+
+  if (borderWidth != 0.0f && aBorderColor.a != 0.0f) {
+    // Push the border.
+    const auto borderColor = ToDeviceColor(aBorderColor);
+    const auto side = wr::ToBorderSide(borderColor, StyleBorderStyle::Solid);
+    const wr::BorderSide sides[4] = {side, side, side, side};
+    const LayoutDeviceSize sideRadius(radius, radius);
+    const auto widths =
+        wr::ToBorderWidths(borderWidth, borderWidth, borderWidth, borderWidth);
+    const auto wrRadius =
+        wr::ToBorderRadius(sideRadius, sideRadius, sideRadius, sideRadius);
+    aWrData.mBuilder.PushBorder(dest, clip, kBackfaceIsVisible, widths,
+                                {sides, 4}, wrRadius);
+  }
+}
+
+void ThemeDrawing::PaintRoundedRectWithRadius(
+    DrawTarget& aDrawTarget, const LayoutDeviceRect& aRect,
+    const LayoutDeviceRect& aClipRect, const sRGBColor& aBackgroundColor,
+    const sRGBColor& aBorderColor, const CSSCoord& aBorderWidth,
+    const CSSCoord& aRadius, const DPIRatio& aDpiRatio) {
+  const LayoutDeviceCoord borderWidth(SnapBorderWidth(aBorderWidth, aDpiRatio));
+  const bool needsClip = !(aRect == aClipRect);
+  if (needsClip) {
+    aDrawTarget.PushClipRect(aClipRect.ToUnknownRect());
+  }
+
+  LayoutDeviceRect rect(aRect);
+  // Deflate the rect by half the border width, so that the middle of the
+  // stroke fills exactly the area we want to fill and not more.
+  rect.Deflate(borderWidth * 0.5f);
+
+  LayoutDeviceCoord radius(aRadius * aDpiRatio - borderWidth * 0.5f);
+  // Fix up the radius if it's too large with the rect we're going to paint.
+  {
+    LayoutDeviceCoord min = std::min(rect.width, rect.height);
+    if (radius * 2.0f > min) {
+      radius = min * 0.5f;
+    }
+  }
+
+  Maybe<gfx::ColorPattern> backgroundPattern;
+  if (aBackgroundColor.a != 0.0f) {
+    backgroundPattern.emplace(ToDeviceColor(aBackgroundColor));
+  }
+  Maybe<gfx::ColorPattern> borderPattern;
+  if (borderWidth != 0.0f && aBorderColor.a != 0.0f) {
+    borderPattern.emplace(ToDeviceColor(aBorderColor));
+  }
+
+  if (borderPattern || backgroundPattern) {
+    if (radius != 0.0f) {
+      gfx::RectCornerRadii radii(radius, radius, radius, radius);
+      RefPtr<gfx::Path> roundedRect =
+          MakePathForRoundedRect(aDrawTarget, rect.ToUnknownRect(), radii);
+
+      if (backgroundPattern) {
+        aDrawTarget.Fill(roundedRect, *backgroundPattern);
+      }
+      if (borderPattern) {
+        aDrawTarget.Stroke(roundedRect, *borderPattern,
+                           gfx::StrokeOptions(borderWidth));
+      }
+    } else {
+      if (backgroundPattern) {
+        aDrawTarget.FillRect(rect.ToUnknownRect(), *backgroundPattern);
+      }
+      if (borderPattern) {
+        aDrawTarget.StrokeRect(rect.ToUnknownRect(), *borderPattern,
+                               gfx::StrokeOptions(borderWidth));
+      }
+    }
+  }
+
+  if (needsClip) {
+    aDrawTarget.PopClip();
+  }
+}
+
+}  // namespace mozilla::widget