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[DIP] Add bmp encoder to write image. (#412)
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@Hanyonggong
Hanyonggong authored Dec 17, 2024
1 parent 91c2c3c commit 9d9d850
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Showing 2 changed files with 137 additions and 7 deletions.
12 changes: 6 additions & 6 deletions examples/DIPDialect/resize4D_nchw.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,17 +23,17 @@
//===----------------------------------------------------------------------===//
#include "buddy/DIP/imgcodecs/loadsave.h"
#include <buddy/Core/Container.h>
#include <buddy/DIP/ImgContainer.h>
#include <buddy/DIP/DIP.h>
#include <buddy/DIP/ImageContainer.h>
#include <buddy/DIP/ImgContainer.h>
#include <iostream>
#include <math.h>

using namespace std;

void testImplementation(int argc, char *argv[]) {
// Read as colar image.
dip::Image<float, 4> inputBatch(argv[1], dip::DIP_RGB, true);
dip::Image<float, 4> inputBatch(argv[1], dip::DIP_RGB);

// Note : Both values in output image dimensions and scaling ratios must be
// positive numbers.
Expand All @@ -42,12 +42,12 @@ void testImplementation(int argc, char *argv[]) {
{1, 3, 224, 224} /*{image_cols, image_rows}*/);

// Define Img with the output of Resize4D.
intptr_t outSizes[3] = {output.getSizes()[2], output.getSizes()[3],
output.getSizes()[1]};
intptr_t outSizes[4] = {output.getSizes()[0], output.getSizes()[1],
output.getSizes()[2], output.getSizes()[3]};

Img<float, 3> outputImageResize4D(output.getData(), outSizes);
dip::Image<float, 4> outputImageResize4D(output.getData(), outSizes);

// dip::imwrite(argv[2], outputImageResize4D);
dip::imageWrite(argv[2], outputImageResize4D);

return;
}
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132 changes: 131 additions & 1 deletion frontend/Interfaces/buddy/DIP/ImgContainer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,28 @@ inline bool ifBigEndian() {
return (*ptr == 0);
}

inline int validToInt(size_t sz) {
int valueInt = (int)sz;
assert((size_t)valueInt == sz);
return valueInt;
}

struct PaletteBlock {
unsigned char b, g, r, a;
};

// file bmp image palette
void FillPalette(PaletteBlock *palette, int bpp, bool negative = false) {
int i, length = 1 << bpp;
int xor_mask = negative ? 255 : 0;

for (i = 0; i < length; i++) {
int val = (i * 255 / (length - 1)) ^ xor_mask;
palette[i].b = palette[i].g = palette[i].r = (unsigned char)val;
palette[i].a = 0;
}
}

template <typename T, size_t N> class Image : public MemRef<T, N> {
public:
// Constructor initializes the image by loading from a file.
Expand All @@ -51,6 +73,9 @@ template <typename T, size_t N> class Image : public MemRef<T, N> {
// norm: Indicates whether to normalize pixel values (default is false).
Image(std::string filename, ImageModes mode, bool norm = false);

// from data to initialize image
Image(T *data, intptr_t sizes[N]);

// Retrieves the name of the current image format as a string.
std::string getFormatName() const {
switch (this->imageFormat) {
Expand All @@ -68,6 +93,8 @@ template <typename T, size_t N> class Image : public MemRef<T, N> {
size_t getHeight() const { return this->height; }
// Returns the bit depth of the image.
int getBitDepth() const { return this->bitDepth; }
// Write a image
static void imageWrite(const std::string &filename, Image<T, N> &image);

private:
// Enum to represent supported image formats.
Expand All @@ -90,12 +117,19 @@ template <typename T, size_t N> class Image : public MemRef<T, N> {
void determineFormat(const std::vector<uint8_t> &fileData);
// Decodes a BMP image from raw file data.
bool decodeBMP(const std::vector<uint8_t> &fileData);
// Decodes a PNG image from raw file data.
// encode image format
int findFormat(const std::string &_ext);
// BMP image encode
void BMPEncode(const std::string &filename, Image<T, N> &image);
#ifdef BUDDY_ENABLE_PNG
// Decodes a PNG image from raw file data.
bool decodePNG(const std::vector<uint8_t> &fileData);
#endif
};

template <typename T, std::size_t N>
Image<T, N>::Image(T *data, intptr_t sizes[N]): MemRef<T, N>(data, sizes) {}

// Image Container Constructor
// Constructs an image container object from the image file path.
template <typename T, std::size_t N>
Expand Down Expand Up @@ -616,6 +650,102 @@ bool Image<T, N>::decodePNG(const std::vector<uint8_t> &fileData) {
}
#endif

template <typename T, size_t N>
int findFormat(const std::string &_ext){
if (_ext.size() <= 1)
return 0;

const char *ext = strrchr(_ext.c_str(), '.');
if (!ext)
return 0;

if (strcmp(ext, ".bmp") == 0) {
return 1;
} else {
std::cerr << "Unsupported to generate" << ext << "format image" << std::endl;
return 0;
}
}

template <typename T, size_t N>
static void imageWrite(const std::string &filename, Image<T, N> &image){
int imformat = findFormat<T, N>(filename);
switch (imformat) {
case 1:
BMPEncode(filename, image);
break;
default:
return;
}
return;
}

template <typename T, size_t N>
void BMPEncode(const std::string &filename, Image<T, N> &image){
std::ofstream bmp(filename, std::ios::binary);
if (!bmp) {
std::cerr << "Failed to create file" << std::endl;
return;
}
int width = image.getSizes()[3];
int height = image.getSizes()[2];
int channels = image.getSizes()[1];
// Align each row of data with 4 bytes
int fileStep = (width * channels + 3) & -4;
int bitmapHeaderSize = 40;
int paletteSize = channels > 1 ? 0 : 1024;
int headerSize = 14 /* fileheader */ + bitmapHeaderSize + paletteSize;
size_t fileSize = (size_t)fileStep * height + headerSize;
PaletteBlock palette[256];
// Fixed value in BMP
int zero = 0;
int one = 1;
char zeropad[] = "\0\0\0\0";

// Write file header
bmp.write("BM", 2);
int fileSizeInt = validToInt(fileSize);
bmp.write(reinterpret_cast<char*>(&fileSizeInt), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&headerSize), 4);

// Write bitmap header
bmp.write(reinterpret_cast<char*>(&bitmapHeaderSize), 4);
bmp.write(reinterpret_cast<char*>(&width), 4);
bmp.write(reinterpret_cast<char*>(&height), 4);
bmp.write(reinterpret_cast<char*>(&one), 2);
int bitDepth = channels << 3;
bmp.write(reinterpret_cast<char*>(&(bitDepth)), 2);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);
bmp.write(reinterpret_cast<char*>(&zero), 4);

// Write palette
if (channels == 1) {
FillPalette(palette, 8);
bmp.write(reinterpret_cast<char*>(&palette), sizeof(palette));
}

// Write image data
int step = width * height;
T *data = image.getData();
for (int y = height - 1; y >= 0; y--) {
for (int i = 0; i < width; i++) {
for (int t = channels - 1; t >= 0; t--) {
unsigned char pixel= static_cast<unsigned char>(data[y * width + i + t * step]);
bmp.write(reinterpret_cast<char*>(&pixel), 1);
}
}
if (fileStep > width * channels)
bmp.write(zeropad, fileStep - width * channels);
}

bmp.close();
}

} // namespace dip

#endif // FRONTEND_INTERFACES_BUDDY_DIP_IMGCONTAINER

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