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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 
      9 #ifndef SkPDFShader_DEFINED
     10 #define SkPDFShader_DEFINED
     11 
     12 #include "SkBitmapKey.h"
     13 #include "SkMacros.h"
     14 #include "SkPDFTypes.h"
     15 #include "SkShader.h"
     16 
     17 
     18 class SkPDFDocument;
     19 class SkMatrix;
     20 struct SkIRect;
     21 
     22 /** Make a PDF shader for the passed SkShader. If the SkShader is invalid in
     23  *  some way, returns nullptr.
     24  *
     25  *  In PDF parlance, this is a pattern, used in place of a color when the
     26  *  pattern color space is selected.
     27  *
     28  *  May cache the shader in the document for later re-use.  If this function is
     29  *  called again with an equivalent shader,  a new reference to the cached pdf
     30  *  shader may be returned.
     31  *
     32  *  @param doc         The parent document, must be non-null.
     33  *  @param shader      The SkShader to emulate.
     34  *  @param ctm         The current transform matrix. (PDF shaders are absolutely
     35  *                     positioned, relative to where the page is drawn.)
     36  *  @param surfaceBBox The bounding box of the drawing surface (with matrix
     37  *                     already applied).
     38  *  @param paintColor  Color+Alpha of the paint.  Color is usually ignored,
     39  *                     unless it is a alpha shader.
     40  */
     41 SkPDFIndirectReference SkPDFMakeShader(SkPDFDocument* doc,
     42                                        SkShader* shader,
     43                                        const SkMatrix& ctm,
     44                                        const SkIRect& surfaceBBox,
     45                                        SkColor paintColor);
     46 
     47 SK_BEGIN_REQUIRE_DENSE
     48 struct SkPDFImageShaderKey {
     49     SkMatrix fCanvasTransform;
     50     SkMatrix fShaderTransform;
     51     SkIRect fBBox;
     52     SkBitmapKey fBitmapKey;
     53     SkShader::TileMode fImageTileModes[2];
     54     SkColor fPaintColor;
     55 };
     56 SK_END_REQUIRE_DENSE
     57 
     58 inline bool operator==(const SkPDFImageShaderKey& a, const SkPDFImageShaderKey& b) {
     59     SkASSERT(a.fBitmapKey.fID != 0);
     60     SkASSERT(b.fBitmapKey.fID != 0);
     61     return a.fCanvasTransform   == b.fCanvasTransform
     62         && a.fShaderTransform   == b.fShaderTransform
     63         && a.fBBox              == b.fBBox
     64         && a.fBitmapKey         == b.fBitmapKey
     65         && a.fImageTileModes[0] == b.fImageTileModes[0]
     66         && a.fImageTileModes[1] == b.fImageTileModes[1]
     67         && a.fPaintColor        == b.fPaintColor;
     68 }
     69 #endif
     70