減色プログラム
Revisão | 95078fb8e8ff46f6d0c811177d4ab407c3c3321a (tree) |
---|---|
Hora | 2011-05-29 18:52:55 |
Autor | berupon <berupon@gmai...> |
Commiter | berupon |
追加忘れ
@@ -0,0 +1,183 @@ | ||
1 | +#include "stdafx.h" | |
2 | +#include "ImageIO_bmp.h" | |
3 | + | |
4 | +#include <stdio.h> | |
5 | +#define TRACE printf | |
6 | +#include <assert.h> | |
7 | + | |
8 | +#include <windows.h> | |
9 | + | |
10 | +static | |
11 | +bool Read_BITMAPINFOHEADER(IFile& file, BITMAPINFOHEADER& bmih) | |
12 | +{ | |
13 | + size_t fileSize = file.Size(); | |
14 | + if (fileSize <= 54) { | |
15 | + TRACE("file size <= 54 bytes."); | |
16 | + return false; | |
17 | + } | |
18 | + BITMAPFILEHEADER bmpFileHeader; | |
19 | + size_t readBytes = 0; | |
20 | + file.Read(&bmpFileHeader, 14, readBytes); | |
21 | + assert(readBytes == 14); | |
22 | + if (bmpFileHeader.bfType != 19778) { | |
23 | + TRACE("file hedear bfType != 19778"); | |
24 | + return false; | |
25 | + } | |
26 | + | |
27 | + file.Read(&bmih, 40, readBytes); | |
28 | + if (readBytes != 40) { | |
29 | + TRACE("bmih shortage."); | |
30 | + return false; | |
31 | + } | |
32 | + | |
33 | + return true; | |
34 | +} | |
35 | + | |
36 | +static | |
37 | +bool getImageInfo(ImageInfo& info, const BITMAPINFOHEADER& bmih) | |
38 | +{ | |
39 | + info.width = bmih.biWidth; | |
40 | + info.height = bmih.biHeight; | |
41 | + switch (bmih.biBitCount) { | |
42 | + case 1: | |
43 | + case 2: | |
44 | + case 4: | |
45 | + return false; | |
46 | + break; | |
47 | + case 8: | |
48 | + info.bitsPerSample = 8; | |
49 | + info.samplesPerPixel = 1; | |
50 | + break; | |
51 | + case 16: | |
52 | + return false; | |
53 | + case 24: | |
54 | + info.bitsPerSample = 8; | |
55 | + info.samplesPerPixel = 3; | |
56 | + break; | |
57 | + case 32: | |
58 | + info.bitsPerSample = 8; | |
59 | + info.samplesPerPixel = 4; | |
60 | + break; | |
61 | + } | |
62 | + return true; | |
63 | +} | |
64 | + | |
65 | +bool ReadImageInfo_bmp(IFile& file, ImageInfo& info) | |
66 | +{ | |
67 | + BITMAPINFOHEADER bmih; | |
68 | + if (!Read_BITMAPINFOHEADER(file, bmih)) { | |
69 | + return false; | |
70 | + } | |
71 | + if (!getImageInfo(info, bmih)) { | |
72 | + return false; | |
73 | + } | |
74 | + return true; | |
75 | +} | |
76 | + | |
77 | +bool ReadImage_bmp(IFile& file, ImageInfo& info, void* dest, int lineOffset, void* palettes) | |
78 | +{ | |
79 | + file.Seek(0, FILE_BEGIN); | |
80 | + | |
81 | + BITMAPINFOHEADER bmih; | |
82 | + if (!Read_BITMAPINFOHEADER(file, bmih)) { | |
83 | + return false; | |
84 | + } | |
85 | + if (!getImageInfo(info, bmih)) { | |
86 | + return false; | |
87 | + } | |
88 | + size_t bmiColorsLen = 0; | |
89 | + switch (bmih.biBitCount) { | |
90 | + case 1: | |
91 | + bmiColorsLen = 2; | |
92 | + break; | |
93 | + case 4: | |
94 | + bmiColorsLen = 16; | |
95 | + break; | |
96 | + case 8: | |
97 | + bmiColorsLen = 256; | |
98 | + break; | |
99 | + case 16: | |
100 | + TRACE("16 bit BMP not supported."); | |
101 | + return false; | |
102 | + break; | |
103 | + case 32: | |
104 | + if (bmih.biCompression == BI_BITFIELDS) { | |
105 | + bmiColorsLen = 3; | |
106 | + } | |
107 | + } | |
108 | + size_t readBytes = 0; | |
109 | + if (bmiColorsLen) { | |
110 | + size_t needBytes = /*sizeof(RGBQUAD)*/4*bmiColorsLen; | |
111 | + file.Read(palettes, needBytes, readBytes); | |
112 | + if (readBytes != needBytes) { | |
113 | + TRACE("bmiColors read failed."); | |
114 | + return false; | |
115 | + } | |
116 | + } | |
117 | + const int lineBytes = ((((bmih.biWidth * bmih.biBitCount) + 31) & ~31) >> 3); | |
118 | + const int lineIdx = (bmih.biHeight < 0) ? 0 : (bmih.biHeight-1); | |
119 | + OffsetPtr(dest, lineOffset * lineIdx); | |
120 | + lineOffset *= (bmih.biHeight < 0) ? 1 : -1; | |
121 | + | |
122 | + const size_t height = abs(bmih.biHeight); | |
123 | + for (size_t y=0; y<height; ++y) { | |
124 | + file.Read(dest, lineBytes, readBytes); | |
125 | + if (readBytes != lineBytes) { | |
126 | + TRACE("read bytes != lineBytes."); | |
127 | + return false; | |
128 | + } | |
129 | + OffsetPtr(dest, lineOffset); | |
130 | + } | |
131 | + | |
132 | + return true; | |
133 | +} | |
134 | + | |
135 | +bool WriteImage_bmp(IFile& file, const ImageInfo& info, const void* data, int lineOffset) | |
136 | +{ | |
137 | + file.Seek(0, FILE_BEGIN); | |
138 | + | |
139 | + if (info.bitsPerSample % 8) { | |
140 | + return false; | |
141 | + } | |
142 | + | |
143 | + const size_t bitsPerPixel = info.bitsPerSample * info.samplesPerPixel; | |
144 | + const size_t imageSize = info.width * info.height * (bitsPerPixel / 8); | |
145 | + size_t nBytesWritten; | |
146 | + { | |
147 | + BITMAPFILEHEADER bfh; | |
148 | + bfh.bfType = 19778; // BM | |
149 | + bfh.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + imageSize; | |
150 | + bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); | |
151 | + file.Write(&bfh, sizeof(bfh), nBytesWritten); | |
152 | + } | |
153 | + | |
154 | + { | |
155 | + BITMAPINFOHEADER bmih; | |
156 | + bmih.biSize = sizeof(bmih); | |
157 | + bmih.biWidth = info.width; | |
158 | + bmih.biHeight = info.height; | |
159 | + bmih.biPlanes = 1; | |
160 | + bmih.biBitCount = bitsPerPixel; | |
161 | + bmih.biCompression = BI_RGB; | |
162 | + bmih.biSize = imageSize; | |
163 | + bmih.biXPelsPerMeter = bmih.biYPelsPerMeter = 0; | |
164 | + bmih.biClrUsed = 0; | |
165 | + bmih.biClrImportant = 0; | |
166 | + file.Write(&bmih, sizeof(bmih), nBytesWritten); | |
167 | + } | |
168 | + | |
169 | + const void* pLine = ((const uint8_t*)data + lineOffset * (info.height-1)); | |
170 | + const size_t lineBytes = ((((info.width * bitsPerPixel) + 31) & ~31) >> 3); | |
171 | + for (size_t y=0; y<info.height; ++y) { | |
172 | + file.Write(pLine, lineBytes, nBytesWritten); | |
173 | + if (nBytesWritten != lineBytes) { | |
174 | + TRACE("nBytesWritten != lineBytes."); | |
175 | + return false; | |
176 | + } | |
177 | + OffsetPtr(pLine, -lineOffset); | |
178 | + } | |
179 | + | |
180 | + return true; | |
181 | + | |
182 | +} | |
183 | + |
@@ -0,0 +1,9 @@ | ||
1 | +#pragma once | |
2 | + | |
3 | +#include "ImageIO.h" | |
4 | + | |
5 | +bool ReadImageInfo_bmp(IFile& file, ImageInfo& info); | |
6 | +bool ReadImage_bmp(IFile& file, ImageInfo& info, void* dest, int lineOffset, void* palettes); | |
7 | + | |
8 | +bool WriteImage_bmp(IFile& file, const ImageInfo& info, const void* data, int lineOffset); | |
9 | + |