fix windows build; add blend modes

core/fxge/skia/fx_skia_device.cpp

Index: core/fxge/skia/fx_skia_device.cpp
diff --git a/core/fxge/skia/fx_skia_device.cpp b/core/fxge/skia/fx_skia_device.cpp
index a06eac80b4821a309c6fed4b413af382046b9b9f..3e78044240e4083ed90582abd173f1bd2fc51264 100644
--- a/core/fxge/skia/fx_skia_device.cpp
+++ b/core/fxge/skia/fx_skia_device.cpp
@@ -37,8 +37,8 @@ static void DebugShowCanvasMatrix(const SkCanvas* canvas) {
   SkMatrix matrix = canvas->getTotalMatrix();
   SkScalar m[9];
   matrix.get9(m);
-  printf("(%g,%g,%g) (%g,%g,%g) (%g,%g,%g)\n", m[0], m[1], m[2], m[3], m[4], m[5], m[6],
-         m[7], m[8]);
+  printf("(%g,%g,%g) (%g,%g,%g) (%g,%g,%g)\n", m[0], m[1], m[2], m[3], m[4],
+         m[5], m[6], m[7], m[8]);
 #endif  // SHOW_SKIA_PATH
 }
 
@@ -97,6 +97,57 @@ static SkPath BuildPath(const CFX_PathData* pPathData) {
   return skPath;
 }
 
+static SkMatrix ToSkMatrix(const CFX_Matrix& m) {
+  SkMatrix skMatrix;
+  skMatrix.setAll(m.a, m.b, m.e, m.c, m.d, m.f, 0, 0, 1);
+  return skMatrix;
+}
+
+// use when pdf's y-axis points up insead of down
+static SkMatrix ToFlippedSkMatrix(const CFX_Matrix& m) {
+  SkMatrix skMatrix;
+  skMatrix.setAll(m.a, m.b, m.e, -m.c, -m.d, m.f, 0, 0, 1);
+  return skMatrix;
+}
+
+static SkXfermode::Mode GetSkiaBlendMode(int blend_type) {
+  switch (blend_type) {
+    case FXDIB_BLEND_MULTIPLY:
+      return SkXfermode::kMultiply_Mode;
+    case FXDIB_BLEND_SCREEN:
+      return SkXfermode::kScreen_Mode;
+    case FXDIB_BLEND_OVERLAY:
+      return SkXfermode::kOverlay_Mode;
+    case FXDIB_BLEND_DARKEN:
+      return SkXfermode::kDarken_Mode;
+    case FXDIB_BLEND_LIGHTEN:
+      return SkXfermode::kLighten_Mode;
+    case FXDIB_BLEND_COLORDODGE:
+      return SkXfermode::kColorDodge_Mode;
+    case FXDIB_BLEND_COLORBURN:
+      return SkXfermode::kColorBurn_Mode;
+    case FXDIB_BLEND_HARDLIGHT:
+      return SkXfermode::kHardLight_Mode;
+    case FXDIB_BLEND_SOFTLIGHT:
+      return SkXfermode::kSoftLight_Mode;
+    case FXDIB_BLEND_DIFFERENCE:
+      return SkXfermode::kDifference_Mode;
+    case FXDIB_BLEND_EXCLUSION:
+      return SkXfermode::kExclusion_Mode;
+    case FXDIB_BLEND_HUE:
+      return SkXfermode::kHue_Mode;
+    case FXDIB_BLEND_SATURATION:
+      return SkXfermode::kSaturation_Mode;
+    case FXDIB_BLEND_COLOR:
+      return SkXfermode::kColor_Mode;
+    case FXDIB_BLEND_LUMINOSITY:
+      return SkXfermode::kLuminosity_Mode;
+    case FXDIB_BLEND_NORMAL:
+    default:
+      return SkXfermode::kSrcOver_Mode;
+  }
+}
+
 // convert a stroking path to scanlines
 void CFX_SkiaDeviceDriver::PaintStroke(SkPaint* spaint,
                                        const CFX_GraphStateData* pGraphState,
@@ -132,8 +183,9 @@ void CFX_SkiaDeviceDriver::PaintStroke(SkPaint* spaint,
   inverse.set(SkMatrix::kMTransY, 0);
   SkVector deviceUnits[2] = {{0, 1}, {1, 0}};
   inverse.mapPoints(deviceUnits, SK_ARRAY_COUNT(deviceUnits));
-  FX_FLOAT width = SkTMax(pGraphState->m_LineWidth,
-                          SkTMin(deviceUnits[0].length(), deviceUnits[1].length()));
+  FX_FLOAT width =
+      SkTMax(pGraphState->m_LineWidth,
+             SkTMin(deviceUnits[0].length(), deviceUnits[1].length()));
   if (pGraphState->m_DashArray) {
     int count = (pGraphState->m_DashCount + 1) / 2;
     SkScalar* intervals = FX_Alloc2D(SkScalar, count, sizeof(SkScalar));
@@ -203,19 +255,6 @@ CFX_SkiaDeviceDriver::~CFX_SkiaDeviceDriver() {
   delete m_pAggDriver;
 }
 
-static SkMatrix ToSkMatrix(const CFX_Matrix& m) {
-    SkMatrix skMatrix;
-    skMatrix.setAll(m.a, m.b, m.e, m.c, m.d, m.f, 0, 0, 1);
-    return skMatrix;
-}
-
-// use when pdf's y-axis points up insead of down
-static SkMatrix ToFlippedSkMatrix(const CFX_Matrix& m) {
-    SkMatrix skMatrix;
-    skMatrix.setAll(m.a, m.b, m.e, -m.c, -m.d, m.f, 0, 0, 1);
-    return skMatrix;
-}
-
 FX_BOOL CFX_SkiaDeviceDriver::DrawDeviceText(int nChars,
                                              const FXTEXT_CHARPOS* pCharPos,
                                              CFX_Font* pFont,
@@ -345,6 +384,7 @@ FX_BOOL CFX_SkiaDeviceDriver::DrawPath(
   SkPath skPath = BuildPath(pPathData);
   SkPaint spaint;
   spaint.setAntiAlias(true);
+  spaint.setXfermodeMode(GetSkiaBlendMode(blend_type));
   m_pCanvas->save();
   SkMatrix skMatrix = ToSkMatrix(*pObject2Device);
   m_pCanvas->concat(skMatrix);
@@ -380,6 +420,7 @@ FX_BOOL CFX_SkiaDeviceDriver::FillRect(const FX_RECT* pRect,
   SkPaint spaint;
   spaint.setAntiAlias(true);
   spaint.setColor(fill_color);
+  spaint.setXfermodeMode(GetSkiaBlendMode(blend_type));
 
   m_pCanvas->drawRect(
       SkRect::MakeLTRB(pRect->left, pRect->top, pRect->right, pRect->bottom),
@@ -513,6 +554,7 @@ FX_BOOL CFX_SkiaDeviceDriver::StartDIBits(const CFX_DIBSource* pSource,
   SkPaint paint;
   paint.setAntiAlias(true);
   paint.setFilterQuality(kHigh_SkFilterQuality);
+  paint.setXfermodeMode(GetSkiaBlendMode(blend_type));
   m_pCanvas->drawBitmap(skBitmap, 0, 0, &paint);
   m_pCanvas->restore();
   return TRUE;