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1 /* | |
2 * Copyright 2015 The Android Open Source Project | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkCodecPriv_DEFINED | |
9 #define SkCodecPriv_DEFINED | |
10 | |
11 #include "SkImageInfo.h" | |
12 #include "SkSwizzler.h" | |
13 #include "SkTypes.h" | |
14 | |
15 /* | |
16 * | |
17 * Helper routine for alpha result codes | |
18 * | |
19 */ | |
20 #define INIT_RESULT_ALPHA \ | |
21 uint8_t zeroAlpha = 0; \ | |
22 uint8_t maxAlpha = 0xFF; | |
23 | |
24 #define UPDATE_RESULT_ALPHA(alpha) \ | |
25 zeroAlpha |= (alpha); \ | |
26 maxAlpha &= (alpha); | |
27 | |
28 #define COMPUTE_RESULT_ALPHA \ | |
29 SkSwizzler::GetResult(zeroAlpha, maxAlpha); | |
30 | |
31 /* | |
32 * | |
33 * Compute row bytes for an image using pixels per byte | |
34 * | |
35 */ | |
36 static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) { | |
37 return (width + pixelsPerByte - 1) / pixelsPerByte; | |
38 } | |
39 | |
40 /* | |
41 * | |
42 * Compute row bytes for an image using bytes per pixel | |
43 * | |
44 */ | |
45 static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) { | |
46 return width * bytesPerPixel; | |
47 } | |
48 | |
49 /* | |
50 * | |
51 * Compute row bytes for an image | |
52 * | |
53 */ | |
54 static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) { | |
55 if (bitsPerPixel < 16) { | |
56 SkASSERT(0 == 8 % bitsPerPixel); | |
57 const uint32_t pixelsPerByte = 8 / bitsPerPixel; | |
58 return compute_row_bytes_ppb(width, pixelsPerByte); | |
59 } else { | |
60 SkASSERT(0 == bitsPerPixel % 8); | |
61 const uint32_t bytesPerPixel = bitsPerPixel / 8; | |
62 return compute_row_bytes_bpp(width, bytesPerPixel); | |
63 } | |
64 } | |
65 | |
66 /* | |
67 * | |
68 * Checks if alpha types are premul and unpremul | |
69 * | |
70 */ | |
71 static inline bool premul_and_unpremul(SkAlphaType dst, SkAlphaType src) { | |
72 return kPremul_SkAlphaType == dst && kUnpremul_SkAlphaType == src; | |
73 } | |
74 | |
75 /* | |
76 * | |
77 * Get a byte from a buffer | |
78 * This method is unsafe, the caller is responsible for performing a check | |
79 * | |
80 */ | |
81 static inline uint8_t get_byte(uint8_t* buffer, uint32_t i) { | |
82 return buffer[i]; | |
83 } | |
84 | |
85 /* | |
86 * | |
87 * Get a short from a buffer | |
88 * This method is unsafe, the caller is responsible for performing a check | |
89 * | |
90 */ | |
91 static inline uint16_t get_short(uint8_t* buffer, uint32_t i) { | |
92 uint16_t result; | |
93 memcpy(&result, &(buffer[i]), 2); | |
94 #ifdef SK_CPU_BENDIAN | |
95 return SkEndianSwap16(result); | |
96 #else | |
97 return result; | |
98 #endif | |
99 } | |
100 | |
101 /* | |
102 * | |
103 * Get an int from a buffer | |
104 * This method is unsafe, the caller is responsible for performing a check | |
105 * | |
106 */ | |
107 static inline uint32_t get_int(uint8_t* buffer, uint32_t i) { | |
108 uint32_t result; | |
109 memcpy(&result, &(buffer[i]), 4); | |
110 #ifdef SK_CPU_BENDIAN | |
111 return SkEndianSwap32(result); | |
112 #else | |
113 return result; | |
114 #endif | |
115 } | |
116 | |
117 #endif // SkCodecPriv_DEFINED | |
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