gfx/skia/trunk/src/images/SkScaledBitmapSampler.h@129ffea94266
gfx/skia/trunk/src/images/SkScaledBitmapSampler.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.
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 */
8 #ifndef SkScaledBitmapSampler_DEFINED
9 #define SkScaledBitmapSampler_DEFINED
11 #include "SkTypes.h"
12 #include "SkColor.h"
13 #include "SkImageDecoder.h"
15 class SkBitmap;
17 class SkScaledBitmapSampler {
18 public:
19 SkScaledBitmapSampler(int origWidth, int origHeight, int cellSize);
21 int scaledWidth() const { return fScaledWidth; }
22 int scaledHeight() const { return fScaledHeight; }
24 int srcY0() const { return fY0; }
25 int srcDX() const { return fDX; }
26 int srcDY() const { return fDY; }
28 enum SrcConfig {
29 kGray, // 1 byte per pixel
30 kIndex, // 1 byte per pixel
31 kRGB, // 3 bytes per pixel
32 kRGBX, // 4 byes per pixel (ignore 4th)
33 kRGBA, // 4 bytes per pixel
34 kRGB_565 // 2 bytes per pixel
35 };
37 // Given a dst bitmap (with pixels already allocated) and a src-config,
38 // prepares iterator to process the src colors and write them into dst.
39 // Returns false if the request cannot be fulfulled.
40 bool begin(SkBitmap* dst, SrcConfig sc, const SkImageDecoder& decoder,
41 const SkPMColor* = NULL);
42 // call with row of src pixels, for y = 0...scaledHeight-1.
43 // returns true if the row had non-opaque alpha in it
44 bool next(const uint8_t* SK_RESTRICT src);
46 // Like next(), but specifies the y value of the source row, so the
47 // rows can come in any order. If the row is not part of the output
48 // sample, it will be skipped. Only sampleInterlaced OR next should
49 // be called for one SkScaledBitmapSampler.
50 bool sampleInterlaced(const uint8_t* SK_RESTRICT src, int srcY);
52 typedef bool (*RowProc)(void* SK_RESTRICT dstRow,
53 const uint8_t* SK_RESTRICT src,
54 int width, int deltaSrc, int y,
55 const SkPMColor[]);
57 private:
58 int fScaledWidth;
59 int fScaledHeight;
61 int fX0; // first X coord to sample
62 int fY0; // first Y coord (scanline) to sample
63 int fDX; // step between X samples
64 int fDY; // step between Y samples
66 #ifdef SK_DEBUG
67 // Keep track of whether the caller is using next or sampleInterlaced.
68 // Only one can be used per sampler.
69 enum SampleMode {
70 kUninitialized_SampleMode,
71 kConsecutive_SampleMode,
72 kInterlaced_SampleMode,
73 };
75 SampleMode fSampleMode;
76 #endif
78 // setup state
79 char* fDstRow; // points into bitmap's pixels
80 size_t fDstRowBytes;
81 int fCurrY; // used for dithering
82 int fSrcPixelSize; // 1, 3, 4
83 RowProc fRowProc;
85 // optional reference to the src colors if the src is a palette model
86 const SkPMColor* fCTable;
88 #ifdef SK_DEBUG
89 // Helper class allowing a test to have access to fRowProc.
90 friend class RowProcTester;
91 #endif
92 };
94 #endif
