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gfx/skia/trunk/src/core/SkBlitter.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkBlitter.h

Sat, 03 Jan 2015 20:18:00 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Sat, 03 Jan 2015 20:18:00 +0100
branch
TOR_BUG_3246
changeset 7
129ffea94266
permissions
-rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

michael@0 1
michael@0 2 /*
michael@0 3 * Copyright 2006 The Android Open Source Project
michael@0 4 *
michael@0 5 * Use of this source code is governed by a BSD-style license that can be
michael@0 6 * found in the LICENSE file.
michael@0 7 */
michael@0 8
michael@0 9
michael@0 10 #ifndef SkBlitter_DEFINED
michael@0 11 #define SkBlitter_DEFINED
michael@0 12
michael@0 13 #include "SkBitmap.h"
michael@0 14 #include "SkBitmapProcShader.h"
michael@0 15 #include "SkMask.h"
michael@0 16 #include "SkMatrix.h"
michael@0 17 #include "SkPaint.h"
michael@0 18 #include "SkRefCnt.h"
michael@0 19 #include "SkRegion.h"
michael@0 20 #include "SkShader.h"
michael@0 21 #include "SkSmallAllocator.h"
michael@0 22
michael@0 23 /** SkBlitter and its subclasses are responsible for actually writing pixels
michael@0 24 into memory. Besides efficiency, they handle clipping and antialiasing.
michael@0 25 */
michael@0 26 class SkBlitter {
michael@0 27 public:
michael@0 28 virtual ~SkBlitter();
michael@0 29
michael@0 30 /// Blit a horizontal run of one or more pixels.
michael@0 31 virtual void blitH(int x, int y, int width);
michael@0 32 /// Blit a horizontal run of antialiased pixels; runs[] is a *sparse*
michael@0 33 /// zero-terminated run-length encoding of spans of constant alpha values.
michael@0 34 virtual void blitAntiH(int x, int y, const SkAlpha antialias[],
michael@0 35 const int16_t runs[]);
michael@0 36 /// Blit a vertical run of pixels with a constant alpha value.
michael@0 37 virtual void blitV(int x, int y, int height, SkAlpha alpha);
michael@0 38 /// Blit a solid rectangle one or more pixels wide.
michael@0 39 virtual void blitRect(int x, int y, int width, int height);
michael@0 40 /** Blit a rectangle with one alpha-blended column on the left,
michael@0 41 width (zero or more) opaque pixels, and one alpha-blended column
michael@0 42 on the right.
michael@0 43 The result will always be at least two pixels wide.
michael@0 44 */
michael@0 45 virtual void blitAntiRect(int x, int y, int width, int height,
michael@0 46 SkAlpha leftAlpha, SkAlpha rightAlpha);
michael@0 47 /// Blit a pattern of pixels defined by a rectangle-clipped mask;
michael@0 48 /// typically used for text.
michael@0 49 virtual void blitMask(const SkMask&, const SkIRect& clip);
michael@0 50
michael@0 51 /** If the blitter just sets a single value for each pixel, return the
michael@0 52 bitmap it draws into, and assign value. If not, return NULL and ignore
michael@0 53 the value parameter.
michael@0 54 */
michael@0 55 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
michael@0 56
michael@0 57 /**
michael@0 58 * Special method just to identify the null blitter, which is returned
michael@0 59 * from Choose() if the request cannot be fulfilled. Default impl
michael@0 60 * returns false.
michael@0 61 */
michael@0 62 virtual bool isNullBlitter() const;
michael@0 63
michael@0 64 ///@name non-virtual helpers
michael@0 65 void blitMaskRegion(const SkMask& mask, const SkRegion& clip);
michael@0 66 void blitRectRegion(const SkIRect& rect, const SkRegion& clip);
michael@0 67 void blitRegion(const SkRegion& clip);
michael@0 68 ///@}
michael@0 69
michael@0 70 /** @name Factories
michael@0 71 Return the correct blitter to use given the specified context.
michael@0 72 */
michael@0 73 static SkBlitter* Choose(const SkBitmap& device,
michael@0 74 const SkMatrix& matrix,
michael@0 75 const SkPaint& paint,
michael@0 76 SkTBlitterAllocator*,
michael@0 77 bool drawCoverage = false);
michael@0 78
michael@0 79 static SkBlitter* ChooseSprite(const SkBitmap& device,
michael@0 80 const SkPaint&,
michael@0 81 const SkBitmap& src,
michael@0 82 int left, int top,
michael@0 83 SkTBlitterAllocator*);
michael@0 84 ///@}
michael@0 85
michael@0 86 private:
michael@0 87 };
michael@0 88
michael@0 89 /** This blitter silently never draws anything.
michael@0 90 */
michael@0 91 class SkNullBlitter : public SkBlitter {
michael@0 92 public:
michael@0 93 virtual void blitH(int x, int y, int width) SK_OVERRIDE;
michael@0 94 virtual void blitAntiH(int x, int y, const SkAlpha[],
michael@0 95 const int16_t runs[]) SK_OVERRIDE;
michael@0 96 virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE;
michael@0 97 virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE;
michael@0 98 virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE;
michael@0 99 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value) SK_OVERRIDE;
michael@0 100 virtual bool isNullBlitter() const SK_OVERRIDE;
michael@0 101 };
michael@0 102
michael@0 103 /** Wraps another (real) blitter, and ensures that the real blitter is only
michael@0 104 called with coordinates that have been clipped by the specified clipRect.
michael@0 105 This means the caller need not perform the clipping ahead of time.
michael@0 106 */
michael@0 107 class SkRectClipBlitter : public SkBlitter {
michael@0 108 public:
michael@0 109 void init(SkBlitter* blitter, const SkIRect& clipRect) {
michael@0 110 SkASSERT(!clipRect.isEmpty());
michael@0 111 fBlitter = blitter;
michael@0 112 fClipRect = clipRect;
michael@0 113 }
michael@0 114
michael@0 115 virtual void blitH(int x, int y, int width) SK_OVERRIDE;
michael@0 116 virtual void blitAntiH(int x, int y, const SkAlpha[],
michael@0 117 const int16_t runs[]) SK_OVERRIDE;
michael@0 118 virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE;
michael@0 119 virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE;
michael@0 120 virtual void blitAntiRect(int x, int y, int width, int height,
michael@0 121 SkAlpha leftAlpha, SkAlpha rightAlpha) SK_OVERRIDE;
michael@0 122 virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE;
michael@0 123 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value) SK_OVERRIDE;
michael@0 124
michael@0 125 private:
michael@0 126 SkBlitter* fBlitter;
michael@0 127 SkIRect fClipRect;
michael@0 128 };
michael@0 129
michael@0 130 /** Wraps another (real) blitter, and ensures that the real blitter is only
michael@0 131 called with coordinates that have been clipped by the specified clipRgn.
michael@0 132 This means the caller need not perform the clipping ahead of time.
michael@0 133 */
michael@0 134 class SkRgnClipBlitter : public SkBlitter {
michael@0 135 public:
michael@0 136 void init(SkBlitter* blitter, const SkRegion* clipRgn) {
michael@0 137 SkASSERT(clipRgn && !clipRgn->isEmpty());
michael@0 138 fBlitter = blitter;
michael@0 139 fRgn = clipRgn;
michael@0 140 }
michael@0 141
michael@0 142 virtual void blitH(int x, int y, int width) SK_OVERRIDE;
michael@0 143 virtual void blitAntiH(int x, int y, const SkAlpha[],
michael@0 144 const int16_t runs[]) SK_OVERRIDE;
michael@0 145 virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE;
michael@0 146 virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE;
michael@0 147 virtual void blitAntiRect(int x, int y, int width, int height,
michael@0 148 SkAlpha leftAlpha, SkAlpha rightAlpha) SK_OVERRIDE;
michael@0 149 virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE;
michael@0 150 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value) SK_OVERRIDE;
michael@0 151
michael@0 152 private:
michael@0 153 SkBlitter* fBlitter;
michael@0 154 const SkRegion* fRgn;
michael@0 155 };
michael@0 156
michael@0 157 /** Factory to set up the appropriate most-efficient wrapper blitter
michael@0 158 to apply a clip. Returns a pointer to a member, so lifetime must
michael@0 159 be managed carefully.
michael@0 160 */
michael@0 161 class SkBlitterClipper {
michael@0 162 public:
michael@0 163 SkBlitter* apply(SkBlitter* blitter, const SkRegion* clip,
michael@0 164 const SkIRect* bounds = NULL);
michael@0 165
michael@0 166 private:
michael@0 167 SkNullBlitter fNullBlitter;
michael@0 168 SkRectClipBlitter fRectBlitter;
michael@0 169 SkRgnClipBlitter fRgnBlitter;
michael@0 170 };
michael@0 171
michael@0 172 #endif

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