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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* Copyright 2008-2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include <assert.h>
#include <stdint.h>
#include "image.hpp"
namespace image {
#pragma pack(push,2)
struct FileHeader {
uint16_t bfType;
uint32_t bfSize;
uint16_t bfReserved1;
uint16_t bfReserved2;
uint32_t bfOffBits;
};
#pragma pack(pop)
struct InfoHeader {
uint32_t biSize;
int32_t biWidth;
int32_t biHeight;
uint16_t biPlanes;
uint16_t biBitCount;
uint32_t biCompression;
uint32_t biSizeImage;
int32_t biXPelsPerMeter;
int32_t biYPelsPerMeter;
uint32_t biClrUsed;
uint32_t biClrImportant;
};
struct Pixel {
uint8_t rgbBlue;
uint8_t rgbGreen;
uint8_t rgbRed;
uint8_t rgbAlpha;
};
bool
Image::writeBMP(const char *filename) const {
assert(channels == 4);
struct FileHeader bmfh;
struct InfoHeader bmih;
unsigned x, y;
bmfh.bfType = 0x4d42;
bmfh.bfSize = 14 + 40 + height*width*4;
bmfh.bfReserved1 = 0;
bmfh.bfReserved2 = 0;
bmfh.bfOffBits = 14 + 40;
bmih.biSize = 40;
bmih.biWidth = width;
bmih.biHeight = height;
bmih.biPlanes = 1;
bmih.biBitCount = 32;
bmih.biCompression = 0;
bmih.biSizeImage = height*width*4;
bmih.biXPelsPerMeter = 0;
bmih.biYPelsPerMeter = 0;
bmih.biClrUsed = 0;
bmih.biClrImportant = 0;
std::ofstream stream(filename, std::ofstream::binary);
if (!stream) {
return false;
}
stream.write((const char *)&bmfh, 14);
stream.write((const char *)&bmih, 40);
unsigned stride = width*4;
if (flipped) {
for (y = 0; y < height; ++y) {
const unsigned char *ptr = pixels + y * stride;
for (x = 0; x < width; ++x) {
struct Pixel pixel;
pixel.rgbRed = ptr[x*4 + 0];
pixel.rgbGreen = ptr[x*4 + 1];
pixel.rgbBlue = ptr[x*4 + 2];
pixel.rgbAlpha = ptr[x*4 + 3];
stream.write((const char *)&pixel, 4);
}
}
} else {
y = height;
while (y--) {
const unsigned char *ptr = pixels + y * stride;
for (x = 0; x < width; ++x) {
struct Pixel pixel;
pixel.rgbRed = ptr[x*4 + 0];
pixel.rgbGreen = ptr[x*4 + 1];
pixel.rgbBlue = ptr[x*4 + 2];
pixel.rgbAlpha = ptr[x*4 + 3];
stream.write((const char *)&pixel, 4);
}
}
}
stream.close();
return true;
}
} /* namespace image */
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