/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPDFShader_DEFINED
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#define SkPDFShader_DEFINED
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#include "SkBitmapKey.h"
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#include "SkMacros.h"
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#include "SkPDFTypes.h"
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#include "SkShader.h"
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class SkPDFDocument;
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class SkMatrix;
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struct SkIRect;
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/** Make a PDF shader for the passed SkShader. If the SkShader is invalid in
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* some way, returns nullptr.
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*
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* In PDF parlance, this is a pattern, used in place of a color when the
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* pattern color space is selected.
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*
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* May cache the shader in the document for later re-use. If this function is
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* called again with an equivalent shader, a new reference to the cached pdf
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* shader may be returned.
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*
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* @param doc The parent document, must be non-null.
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* @param shader The SkShader to emulate.
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* @param ctm The current transform matrix. (PDF shaders are absolutely
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* positioned, relative to where the page is drawn.)
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* @param surfaceBBox The bounding box of the drawing surface (with matrix
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* already applied).
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* @param paintColor Color+Alpha of the paint. Color is usually ignored,
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* unless it is a alpha shader.
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*/
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SkPDFIndirectReference SkPDFMakeShader(SkPDFDocument* doc,
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SkShader* shader,
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const SkMatrix& ctm,
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const SkIRect& surfaceBBox,
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SkColor paintColor);
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SK_BEGIN_REQUIRE_DENSE
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struct SkPDFImageShaderKey {
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SkMatrix fCanvasTransform;
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SkMatrix fShaderTransform;
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SkIRect fBBox;
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SkBitmapKey fBitmapKey;
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SkShader::TileMode fImageTileModes[2];
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SkColor fPaintColor;
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};
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SK_END_REQUIRE_DENSE
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inline bool operator==(const SkPDFImageShaderKey& a, const SkPDFImageShaderKey& b) {
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SkASSERT(a.fBitmapKey.fID != 0);
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SkASSERT(b.fBitmapKey.fID != 0);
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return a.fCanvasTransform == b.fCanvasTransform
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&& a.fShaderTransform == b.fShaderTransform
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&& a.fBBox == b.fBBox
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&& a.fBitmapKey == b.fBitmapKey
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&& a.fImageTileModes[0] == b.fImageTileModes[0]
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&& a.fImageTileModes[1] == b.fImageTileModes[1]
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&& a.fPaintColor == b.fPaintColor;
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}
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#endif
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