PixelFormat.cpp revision 3db21640519541141137166ce55627cf76e1974b 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <ui/PixelFormat.h>
18#include <pixelflinger/format.h>
19#include <hardware/hardware.h>
20
21namespace android {
22
23static const int COMPONENT_YUV = 0xFF;
24
25size_t PixelFormatInfo::getScanlineSize(unsigned int width) const
26{
27    size_t size;
28    if (components == COMPONENT_YUV) {
29        // YCbCr formats are different.
30        size = (width * bitsPerPixel)>>3;
31    } else {
32        size = width * bytesPerPixel;
33    }
34    return size;
35}
36
37ssize_t bytesPerPixel(PixelFormat format)
38{
39    PixelFormatInfo info;
40    status_t err = getPixelFormatInfo(format, &info);
41    return (err < 0) ? err : info.bytesPerPixel;
42}
43
44ssize_t bitsPerPixel(PixelFormat format)
45{
46    PixelFormatInfo info;
47    status_t err = getPixelFormatInfo(format, &info);
48    return (err < 0) ? err : info.bitsPerPixel;
49}
50
51status_t getPixelFormatInfo(PixelFormat format, PixelFormatInfo* info)
52{
53    if (format < 0)
54        return BAD_VALUE;
55
56    if (info->version != sizeof(PixelFormatInfo))
57        return INVALID_OPERATION;
58
59    // YUV format from the HAL are handled here
60    switch (format) {
61    case HAL_PIXEL_FORMAT_YCbCr_422_SP:
62    case HAL_PIXEL_FORMAT_YCrCb_422_SP:
63    case HAL_PIXEL_FORMAT_YCbCr_422_P:
64    case HAL_PIXEL_FORMAT_YCbCr_422_I:
65    case HAL_PIXEL_FORMAT_CbYCrY_422_I:
66        info->bitsPerPixel = 16;
67        goto done;
68    case HAL_PIXEL_FORMAT_YCbCr_420_SP:
69    case HAL_PIXEL_FORMAT_YCrCb_420_SP:
70    case HAL_PIXEL_FORMAT_YCbCr_420_SP_TILED:
71    case HAL_PIXEL_FORMAT_YCrCb_420_SP_TILED:
72    case HAL_PIXEL_FORMAT_YCbCr_420_P:
73    case HAL_PIXEL_FORMAT_YCbCr_420_I:
74    case HAL_PIXEL_FORMAT_CbYCrY_420_I:
75        info->bitsPerPixel = 12;
76     done:
77        info->format = format;
78        info->components = COMPONENT_YUV;
79        info->bytesPerPixel = 1;
80        info->h_alpha = 0;
81        info->l_alpha = 0;
82        info->h_red = info->h_green = info->h_blue = 8;
83        info->l_red = info->l_green = info->l_blue = 0;
84        return NO_ERROR;
85    }
86
87    size_t numEntries;
88    const GGLFormat *i = gglGetPixelFormatTable(&numEntries) + format;
89    bool valid = uint32_t(format) < numEntries;
90    if (!valid) {
91        return BAD_INDEX;
92    }
93
94    #define COMPONENT(name) \
95        case GGL_##name: info->components = PixelFormatInfo::name; break;
96
97    switch (i->components) {
98        COMPONENT(ALPHA)
99        COMPONENT(RGB)
100        COMPONENT(RGBA)
101        COMPONENT(LUMINANCE)
102        COMPONENT(LUMINANCE_ALPHA)
103        default:
104            return BAD_INDEX;
105    }
106
107    #undef COMPONENT
108
109    info->format = format;
110    info->bytesPerPixel = i->size;
111    info->bitsPerPixel  = i->bitsPerPixel;
112    info->h_alpha       = i->ah;
113    info->l_alpha       = i->al;
114    info->h_red         = i->rh;
115    info->l_red         = i->rl;
116    info->h_green       = i->gh;
117    info->l_green       = i->gl;
118    info->h_blue        = i->bh;
119    info->l_blue        = i->bl;
120
121    return NO_ERROR;
122}
123
124}; // namespace android
125
126