60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
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#include "screenshot.h"
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#include "file.h"
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static const uint16_t TAG_BM = 0x4D42;
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void saveBMP(const char *filename, const uint8_t *bits, const uint8_t *pal, int w, int h) {
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File f;
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if (f.open(filename, "wb", ".")) {
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const int paletteSize = pal ? 4 * 256 : 0;
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const int bitsCount = pal ? 8 : 32;
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const int alignWidth = ((w * bitsCount / 8) + 3) & ~3;
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const int imageSize = alignWidth * h;
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// Write file header
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f.writeUint16LE(TAG_BM);
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f.writeUint32LE(14 + 40 + paletteSize + imageSize);
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f.writeUint16LE(0); // reserved1
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f.writeUint16LE(0); // reserved2
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f.writeUint32LE(14 + 40 + paletteSize);
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// Write info header
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f.writeUint32LE(40);
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f.writeUint32LE(w);
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f.writeUint32LE(h);
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f.writeUint16LE(1); // planes
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f.writeUint16LE(bitsCount); // bit_count
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f.writeUint32LE(0); // compression
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f.writeUint32LE(imageSize); // size_image
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f.writeUint32LE(0); // x_pels_per_meter
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f.writeUint32LE(0); // y_pels_per_meter
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f.writeUint32LE(0); // num_colors_used
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f.writeUint32LE(0); // num_colors_important
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if (pal) {
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// Write palette data
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for (int i = 0; i < 256; ++i) {
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f.writeByte(pal[2]);
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f.writeByte(pal[1]);
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f.writeByte(pal[0]);
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f.writeByte(0);
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pal += 3;
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}
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}
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// Write bitmap data
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w *= bitsCount / 8;
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const int pitch = w;
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bits += h * pitch;
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for (int i = 0; i < h; ++i) {
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bits -= pitch;
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f.write(bits, w);
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int pad = alignWidth - w;
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while (pad--) {
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f.writeByte(0);
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}
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}
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}
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}
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