Implemented transparent gradients

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotation.h"
@@ skipping 407 matching lines @@
 
     push();
     SkPDFUtils::AppendTransform(matrix, fContentStream);
     currentEntry()->fMatrix = matrix;
 }
 
 void GraphicStackState::updateDrawingState(const GraphicStateEntry& state) {
     // PDF treats a shader as a color, so we only set one or the other.
     if (state.fShaderIndex >= 0) {
         if (state.fShaderIndex != currentEntry()->fShaderIndex) {
-            SkString resourceName = SkPDFResourceDict::getResourceName(
-                    SkPDFResourceDict::kPattern_ResourceType,
-                    state.fShaderIndex);
-            fContentStream->writeText("/Pattern CS /Pattern cs /");
-            fContentStream->writeText(resourceName.c_str());
-            fContentStream->writeText(" SCN /");
-            fContentStream->writeText(resourceName.c_str());
-            fContentStream->writeText(" scn\n");
+            SkPDFUtils::ApplyPattern(state.fShaderIndex, fContentStream);
             currentEntry()->fShaderIndex = state.fShaderIndex;
         }
     } else {
         if (state.fColor != currentEntry()->fColor ||
                 currentEntry()->fShaderIndex >= 0) {
             emit_pdf_color(state.fColor, fContentStream);
             fContentStream->writeText("RG ");
             emit_pdf_color(state.fColor, fContentStream);
             fContentStream->writeText("rg\n");
             currentEntry()->fColor = state.fColor;
@@ skipping 954 matching lines @@
     SkMatrix identity;
     identity.reset();
     SkDraw draw;
     draw.fMatrix = &identity;
     draw.fClip = &clipRegion;
     draw.fClipStack = clipStack;
     SkPaint stockPaint;
     this->drawPaint(draw, stockPaint);
     SkAutoTUnref<SkPDFFormXObject> maskFormXObject(createFormXObjectFromDevice());
     SkAutoTUnref<SkPDFGraphicState> sMaskGS(
-        SkPDFGraphicState::GetSMaskGraphicState(maskFormXObject, invertClip));
+        SkPDFGraphicState::GetSMaskGraphicState(maskFormXObject, invertClip,
+                                                SkPDFGraphicState::kAlpha_SMaskMode));
 
     // Draw the xobject with the clip as a mask.
     ScopedContentEntry content(this, &fExistingClipStack, fExistingClipRegion,
                                  identity, stockPaint);
     if (!content.entry()) {
         return;
     }
     SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
                                   &content.entry()->fContent);
     SkPDFUtils::DrawFormXObject(fXObjectResources.count(),
@@ skipping 135 matching lines @@
                                           fExistingClipRegion, identity,
                                           stockPaint);
     if (!inClipContentEntry.entry()) {
         return;
     }
 
     SkAutoTUnref<SkPDFGraphicState> sMaskGS;
     if (xfermode == SkXfermode::kSrcIn_Mode ||
             xfermode == SkXfermode::kSrcOut_Mode) {
         sMaskGS.reset(SkPDFGraphicState::GetSMaskGraphicState(
-                dst, xfermode == SkXfermode::kSrcOut_Mode));
+                dst,
+                xfermode == SkXfermode::kSrcOut_Mode,
+                SkPDFGraphicState::kAlpha_SMaskMode));
         fXObjectResources.push(srcFormXObject.get());
         srcFormXObject.get()->ref();
     } else {
         sMaskGS.reset(SkPDFGraphicState::GetSMaskGraphicState(
-                srcFormXObject.get(), xfermode == SkXfermode::kDstOut_Mode));
+                srcFormXObject.get(),
+                xfermode == SkXfermode::kDstOut_Mode,
+                SkPDFGraphicState::kAlpha_SMaskMode));
         // dst already added to fXObjectResources in drawFormXObjectWithClip.
     }
     SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
                                   &inClipContentEntry.entry()->fContent);
 
     SkPDFUtils::DrawFormXObject(fXObjectResources.count() - 1,
                                 &inClipContentEntry.entry()->fContent);
 
     sMaskGS.reset(SkPDFGraphicState::GetNoSMaskGraphicState());
     SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
@@ skipping 173 matching lines @@
 }
 
 bool SkPDFDevice::onReadPixels(const SkBitmap& bitmap, int x, int y,
                                SkCanvas::Config8888) {
     return false;
 }
 
 bool SkPDFDevice::allowImageFilter(SkImageFilter*) {
     return false;
 }