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save-tiff.cpp
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save-tiff.cpp
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#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#include "save-tiff.h"
#include <cstdio>
#ifdef MSDFGEN_USE_CPP11
#include <cstdint>
#else
namespace msdfgen {
typedef int int32_t;
typedef unsigned uint32_t;
typedef unsigned short uint16_t;
typedef unsigned char uint8_t;
}
#endif
namespace msdfgen {
template <typename T>
static bool writeValue(FILE *file, T value) {
return fwrite(&value, sizeof(T), 1, file) == 1;
}
template <typename T>
static void writeValueRepeated(FILE *file, T value, int times) {
for (int i = 0; i < times; ++i)
writeValue(file, value);
}
static bool writeTiffHeader(FILE *file, int width, int height, int channels) {
#ifdef __BIG_ENDIAN__
writeValue<uint16_t>(file, 0x4d4du);
#else
writeValue<uint16_t>(file, 0x4949u);
#endif
writeValue<uint16_t>(file, 42);
writeValue<uint32_t>(file, 0x0008u); // Offset of first IFD
// Offset = 0x0008
writeValue<uint16_t>(file, 15); // Number of IFD entries
// ImageWidth
writeValue<uint16_t>(file, 0x0100u);
writeValue<uint16_t>(file, 0x0004u);
writeValue<uint32_t>(file, 1);
writeValue<int32_t>(file, width);
// ImageLength
writeValue<uint16_t>(file, 0x0101u);
writeValue<uint16_t>(file, 0x0004u);
writeValue<uint32_t>(file, 1);
writeValue<int32_t>(file, height);
// BitsPerSample
writeValue<uint16_t>(file, 0x0102u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, channels);
if (channels > 1)
writeValue<uint32_t>(file, 0x00c2u); // Offset of 32, 32, ...
else {
writeValue<uint16_t>(file, 32);
writeValue<uint16_t>(file, 0);
}
// Compression
writeValue<uint16_t>(file, 0x0103u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, 1);
writeValue<uint16_t>(file, 1);
writeValue<uint16_t>(file, 0);
// PhotometricInterpretation
writeValue<uint16_t>(file, 0x0106u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, 1);
writeValue<uint16_t>(file, channels >= 3 ? 2 : 1);
writeValue<uint16_t>(file, 0);
// StripOffsets
writeValue<uint16_t>(file, 0x0111u);
writeValue<uint16_t>(file, 0x0004u);
writeValue<uint32_t>(file, 1);
writeValue<uint32_t>(file, 0x00d2u+(channels > 1)*channels*12); // Offset of pixel data
// SamplesPerPixel
writeValue<uint16_t>(file, 0x0115u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, 1);
writeValue<uint16_t>(file, channels);
writeValue<uint16_t>(file, 0);
// RowsPerStrip
writeValue<uint16_t>(file, 0x0116u);
writeValue<uint16_t>(file, 0x0004u);
writeValue<uint32_t>(file, 1);
writeValue<int32_t>(file, height);
// StripByteCounts
writeValue<uint16_t>(file, 0x0117u);
writeValue<uint16_t>(file, 0x0004u);
writeValue<uint32_t>(file, 1);
writeValue<int32_t>(file, sizeof(float)*channels*width*height);
// XResolution
writeValue<uint16_t>(file, 0x011au);
writeValue<uint16_t>(file, 0x0005u);
writeValue<uint32_t>(file, 1);
writeValue<uint32_t>(file, 0x00c2u+(channels > 1)*channels*2); // Offset of 300, 1
// YResolution
writeValue<uint16_t>(file, 0x011bu);
writeValue<uint16_t>(file, 0x0005u);
writeValue<uint32_t>(file, 1);
writeValue<uint32_t>(file, 0x00cau+(channels > 1)*channels*2); // Offset of 300, 1
// ResolutionUnit
writeValue<uint16_t>(file, 0x0128u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, 1);
writeValue<uint16_t>(file, 2);
writeValue<uint16_t>(file, 0);
// SampleFormat
writeValue<uint16_t>(file, 0x0153u);
writeValue<uint16_t>(file, 0x0003u);
writeValue<uint32_t>(file, channels);
if (channels > 1)
writeValue<uint32_t>(file, 0x00d2u+channels*2); // Offset of 3, 3, ...
else {
writeValue<uint16_t>(file, 3);
writeValue<uint16_t>(file, 0);
}
// SMinSampleValue
writeValue<uint16_t>(file, 0x0154u);
writeValue<uint16_t>(file, 0x000bu);
writeValue<uint32_t>(file, channels);
if (channels > 1)
writeValue<uint32_t>(file, 0x00d2u+channels*4); // Offset of 0.f, 0.f, ...
else
writeValue<float>(file, 0.f);
// SMaxSampleValue
writeValue<uint16_t>(file, 0x0155u);
writeValue<uint16_t>(file, 0x000bu);
writeValue<uint32_t>(file, channels);
if (channels > 1)
writeValue<uint32_t>(file, 0x00d2u+channels*8); // Offset of 1.f, 1.f, ...
else
writeValue<float>(file, 1.f);
// Offset = 0x00be
writeValue<uint32_t>(file, 0);
if (channels > 1) {
// 0x00c2 BitsPerSample data
writeValueRepeated<uint16_t>(file, 32, channels);
// 0x00c2 + 2*N XResolution data
writeValue<uint32_t>(file, 300);
writeValue<uint32_t>(file, 1);
// 0x00ca + 2*N YResolution data
writeValue<uint32_t>(file, 300);
writeValue<uint32_t>(file, 1);
// 0x00d2 + 2*N SampleFormat data
writeValueRepeated<uint16_t>(file, 3, channels);
// 0x00d2 + 4*N SMinSampleValue data
writeValueRepeated<float>(file, 0.f, channels);
// 0x00d2 + 8*N SMaxSampleValue data
writeValueRepeated<float>(file, 1.f, channels);
// Offset = 0x00d2 + 12*N
} else {
// 0x00c2 XResolution data
writeValue<uint32_t>(file, 300);
writeValue<uint32_t>(file, 1);
// 0x00ca YResolution data
writeValue<uint32_t>(file, 300);
writeValue<uint32_t>(file, 1);
// Offset = 0x00d2
}
return true;
}
template <int N>
bool saveTiffFloat(const BitmapConstRef<float, N> &bitmap, const char *filename) {
FILE *file = fopen(filename, "wb");
if (!file)
return false;
writeTiffHeader(file, bitmap.width, bitmap.height, N);
for (int y = bitmap.height-1; y >= 0; --y)
fwrite(bitmap(0, y), sizeof(float), N*bitmap.width, file);
return !fclose(file);
}
bool saveTiff(const BitmapConstRef<float, 1> &bitmap, const char *filename) {
return saveTiffFloat(bitmap, filename);
}
bool saveTiff(const BitmapConstRef<float, 3> &bitmap, const char *filename) {
return saveTiffFloat(bitmap, filename);
}
bool saveTiff(const BitmapConstRef<float, 4> &bitmap, const char *filename) {
return saveTiffFloat(bitmap, filename);
}
}