減色プログラム
| 修订版 | 95078fb8e8ff46f6d0c811177d4ab407c3c3321a (tree) |
|---|---|
| 时间 | 2011-05-29 18:52:55 |
| 作者 |  berupon <berupon@gmai...> |
| Commiter | berupon |
追加忘れ
ImageIO/ImageIO_bmp.cpp (diff)
ImageIO/ImageIO_bmp.h (diff)| @@ -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 | + |
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