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