Issue %3005 - Move gfx/ to system/graphics

1 files changed, 396 insertions, 0 deletions

diff --git a/system/graphics/2d/HelpersSkia.h b/system/graphics/2d/HelpersSkia.h
new file mode 100644
index 000000000..95c67ad05
--- /dev/null
+++ b/system/graphics/2d/HelpersSkia.h
@@ -0,0 +1,396 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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/. */
+
+#ifndef MOZILLA_GFX_HELPERSSKIA_H_
+#define MOZILLA_GFX_HELPERSSKIA_H_
+
+#include "2D.h"
+#include "skia/include/core/SkCanvas.h"
+#include "skia/include/effects/SkDashPathEffect.h"
+#include "skia/include/core/SkShader.h"
+#ifdef USE_SKIA_GPU
+#include "skia/include/gpu/GrTypes.h"
+#endif
+#include "mozilla/Assertions.h"
+#include <vector>
+#include "nsDebug.h"
+
+namespace mozilla {
+namespace gfx {
+
+static inline SkColorType
+GfxFormatToSkiaColorType(SurfaceFormat format)
+{
+  switch (format)
+  {
+    case SurfaceFormat::B8G8R8A8:
+      return kBGRA_8888_SkColorType;
+    case SurfaceFormat::B8G8R8X8:
+      // We probably need to do something here.
+      return kBGRA_8888_SkColorType;
+    case SurfaceFormat::R5G6B5_UINT16:
+      return kRGB_565_SkColorType;
+    case SurfaceFormat::A8:
+      return kAlpha_8_SkColorType;
+    default:
+      return kRGBA_8888_SkColorType;
+  }
+}
+
+static inline SurfaceFormat
+SkiaColorTypeToGfxFormat(SkColorType aColorType, SkAlphaType aAlphaType = kPremul_SkAlphaType)
+{
+  switch (aColorType)
+  {
+    case kBGRA_8888_SkColorType:
+      return aAlphaType == kOpaque_SkAlphaType ?
+               SurfaceFormat::B8G8R8X8 : SurfaceFormat::B8G8R8A8;
+    case kRGB_565_SkColorType:
+      return SurfaceFormat::R5G6B5_UINT16;
+    case kAlpha_8_SkColorType:
+      return SurfaceFormat::A8;
+    default:
+      return SurfaceFormat::B8G8R8A8;
+  }
+}
+
+static inline SkAlphaType
+GfxFormatToSkiaAlphaType(SurfaceFormat format)
+{
+  switch (format)
+  {
+    case SurfaceFormat::B8G8R8X8:
+    case SurfaceFormat::R5G6B5_UINT16:
+      return kOpaque_SkAlphaType;
+    default:
+      return kPremul_SkAlphaType;
+  }
+}
+
+static inline SkImageInfo
+MakeSkiaImageInfo(const IntSize& aSize, SurfaceFormat aFormat)
+{
+  return SkImageInfo::Make(aSize.width, aSize.height,
+                           GfxFormatToSkiaColorType(aFormat),
+                           GfxFormatToSkiaAlphaType(aFormat));
+}
+
+#ifdef USE_SKIA_GPU
+static inline GrPixelConfig
+GfxFormatToGrConfig(SurfaceFormat format)
+{
+  switch (format)
+  {
+    case SurfaceFormat::B8G8R8A8:
+      return kBGRA_8888_GrPixelConfig;
+    case SurfaceFormat::B8G8R8X8:
+      // We probably need to do something here.
+      return kBGRA_8888_GrPixelConfig;
+    case SurfaceFormat::R5G6B5_UINT16:
+      return kRGB_565_GrPixelConfig;
+    case SurfaceFormat::A8:
+      return kAlpha_8_GrPixelConfig;
+    default:
+      return kRGBA_8888_GrPixelConfig;
+  }
+
+}
+#endif
+static inline void
+GfxMatrixToSkiaMatrix(const Matrix& mat, SkMatrix& retval)
+{
+    retval.setAll(SkFloatToScalar(mat._11), SkFloatToScalar(mat._21), SkFloatToScalar(mat._31),
+                  SkFloatToScalar(mat._12), SkFloatToScalar(mat._22), SkFloatToScalar(mat._32),
+                  0, 0, SK_Scalar1);
+}
+
+static inline void
+GfxMatrixToSkiaMatrix(const Matrix4x4& aMatrix, SkMatrix& aResult)
+{
+  aResult.setAll(SkFloatToScalar(aMatrix._11), SkFloatToScalar(aMatrix._21), SkFloatToScalar(aMatrix._41),
+                 SkFloatToScalar(aMatrix._12), SkFloatToScalar(aMatrix._22), SkFloatToScalar(aMatrix._42),
+                 SkFloatToScalar(aMatrix._14), SkFloatToScalar(aMatrix._24), SkFloatToScalar(aMatrix._44));
+}
+
+static inline SkPaint::Cap
+CapStyleToSkiaCap(CapStyle aCap)
+{
+  switch (aCap)
+  {
+    case CapStyle::BUTT:
+      return SkPaint::kButt_Cap;
+    case CapStyle::ROUND:
+      return SkPaint::kRound_Cap;
+    case CapStyle::SQUARE:
+      return SkPaint::kSquare_Cap;
+  }
+  return SkPaint::kDefault_Cap;
+}
+
+static inline SkPaint::Join
+JoinStyleToSkiaJoin(JoinStyle aJoin)
+{
+  switch (aJoin)
+  {
+    case JoinStyle::BEVEL:
+      return SkPaint::kBevel_Join;
+    case JoinStyle::ROUND:
+      return SkPaint::kRound_Join;
+    case JoinStyle::MITER:
+    case JoinStyle::MITER_OR_BEVEL:
+      return SkPaint::kMiter_Join;
+  }
+  return SkPaint::kDefault_Join;
+}
+
+static inline bool
+StrokeOptionsToPaint(SkPaint& aPaint, const StrokeOptions &aOptions)
+{
+  // Skia renders 0 width strokes with a width of 1 (and in black),
+  // so we should just skip the draw call entirely.
+  // Skia does not handle non-finite line widths.
+  if (!aOptions.mLineWidth || !IsFinite(aOptions.mLineWidth)) {
+    return false;
+  }
+  aPaint.setStrokeWidth(SkFloatToScalar(aOptions.mLineWidth));
+  aPaint.setStrokeMiter(SkFloatToScalar(aOptions.mMiterLimit));
+  aPaint.setStrokeCap(CapStyleToSkiaCap(aOptions.mLineCap));
+  aPaint.setStrokeJoin(JoinStyleToSkiaJoin(aOptions.mLineJoin));
+
+  if (aOptions.mDashLength > 0) {
+    // Skia only supports dash arrays that are multiples of 2.
+    uint32_t dashCount;
+
+    if (aOptions.mDashLength % 2 == 0) {
+      dashCount = aOptions.mDashLength;
+    } else {
+      dashCount = aOptions.mDashLength * 2;
+    }
+
+    std::vector<SkScalar> pattern;
+    pattern.resize(dashCount);
+
+    for (uint32_t i = 0; i < dashCount; i++) {
+      pattern[i] = SkFloatToScalar(aOptions.mDashPattern[i % aOptions.mDashLength]);
+    }
+
+    sk_sp<SkPathEffect> dash = SkDashPathEffect::Make(&pattern.front(),
+                                                      dashCount,
+                                                      SkFloatToScalar(aOptions.mDashOffset));
+    aPaint.setPathEffect(dash);
+  }
+
+  aPaint.setStyle(SkPaint::kStroke_Style);
+  return true;
+}
+
+static inline SkBlendMode
+GfxOpToSkiaOp(CompositionOp op)
+{
+  switch (op)
+  {
+    case CompositionOp::OP_OVER:
+      return SkBlendMode::kSrcOver;
+    case CompositionOp::OP_ADD:
+      return SkBlendMode::kPlus;
+    case CompositionOp::OP_ATOP:
+      return SkBlendMode::kSrcATop;
+    case CompositionOp::OP_OUT:
+      return SkBlendMode::kSrcOut;
+    case CompositionOp::OP_IN:
+      return SkBlendMode::kSrcIn;
+    case CompositionOp::OP_SOURCE:
+      return SkBlendMode::kSrc;
+    case CompositionOp::OP_DEST_IN:
+      return SkBlendMode::kDstIn;
+    case CompositionOp::OP_DEST_OUT:
+      return SkBlendMode::kDstOut;
+    case CompositionOp::OP_DEST_OVER:
+      return SkBlendMode::kDstOver;
+    case CompositionOp::OP_DEST_ATOP:
+      return SkBlendMode::kDstATop;
+    case CompositionOp::OP_XOR:
+      return SkBlendMode::kXor;
+    case CompositionOp::OP_MULTIPLY:
+      return SkBlendMode::kMultiply;
+    case CompositionOp::OP_SCREEN:
+      return SkBlendMode::kScreen;
+    case CompositionOp::OP_OVERLAY:
+      return SkBlendMode::kOverlay;
+    case CompositionOp::OP_DARKEN:
+      return SkBlendMode::kDarken;
+    case CompositionOp::OP_LIGHTEN:
+      return SkBlendMode::kLighten;
+    case CompositionOp::OP_COLOR_DODGE:
+      return SkBlendMode::kColorDodge;
+    case CompositionOp::OP_COLOR_BURN:
+      return SkBlendMode::kColorBurn;
+    case CompositionOp::OP_HARD_LIGHT:
+      return SkBlendMode::kHardLight;
+    case CompositionOp::OP_SOFT_LIGHT:
+      return SkBlendMode::kSoftLight;
+    case CompositionOp::OP_DIFFERENCE:
+      return SkBlendMode::kDifference;
+    case CompositionOp::OP_EXCLUSION:
+      return SkBlendMode::kExclusion;
+    case CompositionOp::OP_HUE:
+      return SkBlendMode::kHue;
+    case CompositionOp::OP_SATURATION:
+      return SkBlendMode::kSaturation;
+    case CompositionOp::OP_COLOR:
+      return SkBlendMode::kColor;
+    case CompositionOp::OP_LUMINOSITY:
+      return SkBlendMode::kLuminosity;
+    default:
+      return SkBlendMode::kSrcOver;
+  }
+}
+
+/* There's quite a bit of inconsistency about
+ * whether float colors should be rounded with .5f.
+ * We choose to do it to match cairo which also
+ * happens to match the Direct3D specs */
+static inline U8CPU ColorFloatToByte(Float color)
+{
+  //XXX: do a better job converting to int
+  return U8CPU(color*255.f + .5f);
+};
+
+static inline SkColor ColorToSkColor(const Color &color, Float aAlpha)
+{
+  return SkColorSetARGB(ColorFloatToByte(color.a*aAlpha), ColorFloatToByte(color.r),
+                        ColorFloatToByte(color.g), ColorFloatToByte(color.b));
+}
+
+static inline SkPoint
+PointToSkPoint(const Point &aPoint)
+{
+  return SkPoint::Make(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
+}
+
+static inline SkRect
+RectToSkRect(const Rect& aRect)
+{
+  return SkRect::MakeXYWH(SkFloatToScalar(aRect.x), SkFloatToScalar(aRect.y),
+                          SkFloatToScalar(aRect.width), SkFloatToScalar(aRect.height));
+}
+
+static inline SkRect
+IntRectToSkRect(const IntRect& aRect)
+{
+  return SkRect::MakeXYWH(SkIntToScalar(aRect.x), SkIntToScalar(aRect.y),
+                          SkIntToScalar(aRect.width), SkIntToScalar(aRect.height));
+}
+
+static inline SkIRect
+RectToSkIRect(const Rect& aRect)
+{
+  return SkIRect::MakeXYWH(int32_t(aRect.x), int32_t(aRect.y),
+                           int32_t(aRect.width), int32_t(aRect.height));
+}
+
+static inline SkIRect
+IntRectToSkIRect(const IntRect& aRect)
+{
+  return SkIRect::MakeXYWH(aRect.x, aRect.y, aRect.width, aRect.height);
+}
+
+static inline Point
+SkPointToPoint(const SkPoint &aPoint)
+{
+  return Point(SkScalarToFloat(aPoint.x()), SkScalarToFloat(aPoint.y()));
+}
+
+static inline Rect
+SkRectToRect(const SkRect &aRect)
+{
+  return Rect(SkScalarToFloat(aRect.x()), SkScalarToFloat(aRect.y()),
+              SkScalarToFloat(aRect.width()), SkScalarToFloat(aRect.height()));
+}
+
+static inline SkShader::TileMode
+ExtendModeToTileMode(ExtendMode aMode, Axis aAxis)
+{
+  switch (aMode)
+  {
+    case ExtendMode::CLAMP:
+      return SkShader::kClamp_TileMode;
+    case ExtendMode::REPEAT:
+      return SkShader::kRepeat_TileMode;
+    case ExtendMode::REFLECT:
+      return SkShader::kMirror_TileMode;
+    case ExtendMode::REPEAT_X:
+    {
+      return aAxis == Axis::X_AXIS
+             ? SkShader::kRepeat_TileMode
+             : SkShader::kClamp_TileMode;
+    }
+    case ExtendMode::REPEAT_Y:
+    {
+      return aAxis == Axis::Y_AXIS
+             ? SkShader::kRepeat_TileMode
+             : SkShader::kClamp_TileMode;
+    }
+  }
+  return SkShader::kClamp_TileMode;
+}
+
+static inline SkPaint::Hinting
+GfxHintingToSkiaHinting(FontHinting aHinting)
+{
+  switch (aHinting) {
+    case FontHinting::NONE:
+      return SkPaint::kNo_Hinting;
+    case FontHinting::LIGHT:
+      return SkPaint::kSlight_Hinting;
+    case FontHinting::NORMAL:
+      return SkPaint::kNormal_Hinting;
+    case FontHinting::FULL:
+      return SkPaint::kFull_Hinting;
+  }
+  return SkPaint::kNormal_Hinting;
+}
+
+static inline FillRule GetFillRule(SkPath::FillType aFillType)
+{
+  switch (aFillType)
+  {
+  case SkPath::kWinding_FillType:
+    return FillRule::FILL_WINDING;
+  case SkPath::kEvenOdd_FillType:
+    return FillRule::FILL_EVEN_ODD;
+  case SkPath::kInverseWinding_FillType:
+  case SkPath::kInverseEvenOdd_FillType:
+  default:
+    NS_WARNING("Unsupported fill type\n");
+    break;
+  }
+
+  return FillRule::FILL_EVEN_ODD;
+}
+
+/**
+ * Returns true if the canvas is backed by pixels.  Returns false if the canvas
+ * wraps an SkPDFDocument, for example.
+ *
+ * Note: It is not clear whether the test used to implement this function may
+ * result in it returning false in some circumstances even when the canvas
+ * _is_ pixel backed.  In other words maybe it is possible for such a canvas to
+ * have kUnknown_SkPixelGeometry?
+ */
+static inline bool IsBackedByPixels(const SkCanvas* aCanvas)
+{
+  SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
+  if (!aCanvas->getProps(&props) ||
+      props.pixelGeometry() == kUnknown_SkPixelGeometry) {
+    return false;
+  }
+  return true;
+}
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */