1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef _MOZILLA_GFX_DATASURFACEHELPERS_H
#define _MOZILLA_GFX_DATASURFACEHELPERS_H
#include "2D.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
namespace gfx {
int32_t StrideForFormatAndWidth(SurfaceFormat aFormat, int32_t aWidth);
/**
* Create a DataSourceSurface and init the surface with the |aData|. The stride
* of this source surface might be different from the input data's
* |aDataStride|. System will try to use the optimal one.
*/
already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceFromData(
const IntSize& aSize, SurfaceFormat aFormat, const uint8_t* aData,
int32_t aDataStride);
/**
* Similar to CreateDataSourceSurfaceFromData(), but could setup the stride for
* this surface.
*/
already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceWithStrideFromData(
const IntSize& aSize, SurfaceFormat aFormat, int32_t aStride,
const uint8_t* aData, int32_t aDataStride);
/**
* Copy the pixel data from aSrc and pack it into aDst. aSrcSize, aSrcStride
* and aBytesPerPixel give the size, stride and bytes per pixel for aSrc's
* surface. Callers are responsible for making sure that aDst is big enough to
* contain |aSrcSize.width * aSrcSize.height * aBytesPerPixel| bytes.
*/
void CopySurfaceDataToPackedArray(uint8_t* aSrc, uint8_t* aDst,
IntSize aSrcSize, int32_t aSrcStride,
int32_t aBytesPerPixel);
/**
* Convert aSurface to a packed buffer in BGRA format.
*/
UniquePtr<uint8_t[]> SurfaceToPackedBGRA(DataSourceSurface* aSurface);
/**
* Convert aSurface to a packed buffer in BGR format. The pixel data is
* returned in a buffer allocated with new uint8_t[]. The caller then has
* ownership of the buffer and is responsible for delete[]'ing it.
*
* This function is currently only intended for use with surfaces of format
* SurfaceFormat::B8G8R8X8 since the X components of the pixel data (if any)
* are simply dropped (no attempt is made to un-pre-multiply alpha from the
* color components).
*/
uint8_t* SurfaceToPackedBGR(DataSourceSurface* aSurface);
/**
* Clears all the bytes in a DataSourceSurface's data array to zero (so to
* transparent black for SurfaceFormat::B8G8R8A8, for example).
* Note that DataSourceSurfaces can be initialized to zero, which is
* more efficient than zeroing the surface after initialization.
*/
void ClearDataSourceSurface(DataSourceSurface* aSurface);
/**
* Multiplies aStride and aHeight and makes sure the result is limited to
* something sane. To keep things consistent, this should always be used
* wherever we allocate a buffer based on surface stride and height.
*
* @param aExtra Optional argument to specify an additional number of trailing
* bytes (useful for creating intermediate surfaces for filters, for
* example).
*
* @return The result of the multiplication if it is acceptable, or else zero.
*/
size_t BufferSizeFromStrideAndHeight(int32_t aStride, int32_t aHeight,
int32_t aExtraBytes = 0);
/**
* Multiplies aWidth, aHeight, aDepth and makes sure the result is limited to
* something sane. To keep things consistent, this should always be used
* wherever we allocate a buffer based on surface dimensions.
*
* @param aExtra Optional argument to specify an additional number of trailing
* bytes (useful for creating intermediate surfaces for filters, for
* example).
*
* @return The result of the multiplication if it is acceptable, or else zero.
*/
size_t BufferSizeFromDimensions(int32_t aWidth, int32_t aHeight, int32_t aDepth,
int32_t aExtraBytes = 0);
/**
* Copy aSrcRect from aSrc to aDest starting at aDestPoint.
* @returns false if the copy is not successful or the aSrc's size is empty.
*/
bool CopyRect(DataSourceSurface* aSrc, DataSourceSurface* aDest,
IntRect aSrcRect, IntPoint aDestPoint);
/**
* Create a non aliasing copy of aSource. This creates a new DataSourceSurface
* using the factory and copies the bits.
*
* @return a dss allocated by Factory that contains a copy a aSource.
*/
already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceByCloning(
DataSourceSurface* aSource);
/**
* Return the byte at aPoint.
*/
uint8_t* DataAtOffset(DataSourceSurface* aSurface,
const DataSourceSurface::MappedSurface* aMap,
IntPoint aPoint);
/**
* Check if aPoint is contained by the surface.
*
* @returns true if and only if aPoint is inside the surface.
*/
bool SurfaceContainsPoint(SourceSurface* aSurface, const IntPoint& aPoint);
} // namespace gfx
} // namespace mozilla
#endif // _MOZILLA_GFX_DATASURFACEHELPERS_H
|
