The Tor Browser: gfx/skia/trunk/src/gpu/GrStencilBuffer.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2011 Google Inc.

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

    10 #ifndef GrStencilBuffer_DEFINED

    11 #define GrStencilBuffer_DEFINED

    13 #include "GrClipData.h"

    14 #include "GrResource.h"

    16 class GrRenderTarget;

    17 class GrResourceEntry;

    18 class GrResourceKey;

    20 class GrStencilBuffer : public GrResource {

    21 public:

    22     SK_DECLARE_INST_COUNT(GrStencilBuffer);

    24     virtual ~GrStencilBuffer() {

    25         // TODO: allow SB to be purged and detach itself from rts

    26     }

    28     int width() const { return fWidth; }

    29     int height() const { return fHeight; }

    30     int bits() const { return fBits; }

    31     int numSamples() const { return fSampleCnt; }

    33     // called to note the last clip drawn to this buffer.

    34     void setLastClip(int32_t clipStackGenID,

    35                      const SkIRect& clipSpaceRect,

    36                      const SkIPoint clipSpaceToStencilOffset) {

    37         fLastClipStackGenID = clipStackGenID;

    38         fLastClipStackRect = clipSpaceRect;

    39         fLastClipSpaceOffset = clipSpaceToStencilOffset;

    40     }

    42     // called to determine if we have to render the clip into SB.

    43     bool mustRenderClip(int32_t clipStackGenID,

    44                         const SkIRect& clipSpaceRect,

    45                         const SkIPoint clipSpaceToStencilOffset) const {

    46         return fLastClipStackGenID != clipStackGenID ||

    47                fLastClipSpaceOffset != clipSpaceToStencilOffset ||

    48                !fLastClipStackRect.contains(clipSpaceRect);

    49     }

    51     // Places the sb in the cache. The cache takes a ref of the stencil buffer.

    52     void transferToCache();

    54     static GrResourceKey ComputeKey(int width, int height, int sampleCnt);

    56 protected:

    57     GrStencilBuffer(GrGpu* gpu, bool isWrapped, int width, int height, int bits, int sampleCnt)

    58         : GrResource(gpu, isWrapped)

    59         , fWidth(width)

    60         , fHeight(height)

    61         , fBits(bits)

    62         , fSampleCnt(sampleCnt)

    63         , fLastClipStackGenID(SkClipStack::kInvalidGenID) {

    64         fLastClipStackRect.setEmpty();

    65     }

    67 private:

    69     int fWidth;

    70     int fHeight;

    71     int fBits;

    72     int fSampleCnt;

    74     int32_t     fLastClipStackGenID;

    75     SkIRect     fLastClipStackRect;

    76     SkIPoint    fLastClipSpaceOffset;

    78     typedef GrResource INHERITED;

    79 };

    81 #endif

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