71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
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#include "screenshot.h"
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#include "file.h"
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static void TO_LE16(uint8_t *dst, uint16_t value) {
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for (int i = 0; i < 2; ++i) {
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dst[i] = value & 255;
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value >>= 8;
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}
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}
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#define kTgaImageTypeUncompressedTrueColor 2
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#define kTgaImageTypeRunLengthEncodedTrueColor 10
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#define kTgaDirectionTop (1 << 5)
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static const int TGA_HEADER_SIZE = 18;
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void saveTGA(const char *filename, const uint8_t *rgba, int w, int h) {
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static const uint8_t kImageType = kTgaImageTypeRunLengthEncodedTrueColor;
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uint8_t buffer[TGA_HEADER_SIZE];
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buffer[0] = 0; // ID Length
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buffer[1] = 0; // ColorMap Type
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buffer[2] = kImageType;
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TO_LE16(buffer + 3, 0); // ColorMap Start
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TO_LE16(buffer + 5, 0); // ColorMap Length
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buffer[7] = 0; // ColorMap Bits
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TO_LE16(buffer + 8, 0); // X-origin
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TO_LE16(buffer + 10, 0); // Y-origin
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TO_LE16(buffer + 12, w); // Image Width
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TO_LE16(buffer + 14, h); // Image Height
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buffer[16] = 24; // Pixel Depth
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buffer[17] = kTgaDirectionTop; // Descriptor
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File f;
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if (f.open(filename, "wb", ".")) {
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f.write(buffer, sizeof(buffer));
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if (kImageType == kTgaImageTypeUncompressedTrueColor) {
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for (int i = 0; i < w * h; ++i) {
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f.writeByte(rgba[0]);
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f.writeByte(rgba[1]);
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f.writeByte(rgba[2]);
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rgba += 4;
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}
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} else {
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assert(kImageType == kTgaImageTypeRunLengthEncodedTrueColor);
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int prevColor = rgba[2] + (rgba[1] << 8) + (rgba[0] << 16); rgba += 4;
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int count = 0;
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for (int i = 1; i < w * h; ++i) {
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int color = rgba[2] + (rgba[1] << 8) + (rgba[0] << 16); rgba += 4;
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if (prevColor == color && count < 127) {
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++count;
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continue;
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}
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f.writeByte(count | 0x80);
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f.writeByte((prevColor >> 16) & 255);
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f.writeByte((prevColor >> 8) & 255);
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f.writeByte( prevColor & 255);
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count = 0;
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prevColor = color;
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}
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if (count != 0) {
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f.writeByte(count | 0x80);
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f.writeByte((prevColor >> 16) & 255);
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f.writeByte((prevColor >> 8) & 255);
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f.writeByte( prevColor & 255);
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}
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}
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}
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}
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