assimp/tools/assimp_cmd/ImageExtractor.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

/** @file  ImageExtractor.cpp
 *  @brief Implementation of the 'assimp extract' utility
 */

#include "Main.h"

const char* AICMD_MSG_DUMP_HELP_E = 
"assimp extract <model> [<out>] [-t<n>] [-f<fmt>] [-ba] [-s] [common parameters]\n"
"\t -ba   Writes BMP's with alpha channel\n"
"\t -t<n> Zero-based index of the texture to be extracted \n"
"\t -f<f> Specify the file format if <out> is ommitted  \n"
"\t[See the assimp_cmd docs for a full list of all common parameters]  \n"
"\t -cfast    Fast post processing preset, runs just a few important steps \n"
"\t -cdefault Default post processing: runs all recommended steps\n"
"\t -cfull    Fires almost all post processing steps \n"
;

#define AI_EXTRACT_WRITE_BMP_ALPHA 0x1
#include "Compiler/pushpack1.h"

// -----------------------------------------------------------------------------------
// Data structure for the first header of a BMP
struct BITMAPFILEHEADER 
{
	uint16_t  bfType ;
	uint32_t  bfSize;
	uint16_t  bfReserved1 ;
	uint16_t  bfReserved2; 
	uint32_t  bfOffBits; 
} PACK_STRUCT;

// -----------------------------------------------------------------------------------
// Data structure for the second header of a BMP
struct BITMAPINFOHEADER
{
	int32_t        biSize;
	int32_t        biWidth;
	int32_t        biHeight;
	int16_t        biPlanes;
	int16_t        biBitCount;
	uint32_t       biCompression;
	int32_t        biSizeImage;
	int32_t        biXPelsPerMeter;
	int32_t        biYPelsPerMeter;
	int32_t        biClrUsed;
	int32_t        biClrImportant;

	// pixel data follows header
} PACK_STRUCT;

// -----------------------------------------------------------------------------------
// Data structure for the header of a TGA
struct TGA_HEADER
{
    uint8_t  identsize;          // size of ID field that follows 18 byte header (0 usually)
    uint8_t  colourmaptype;      // type of colour map 0=none, 1=has palette
    uint8_t  imagetype;          // type of image 0=none,1=indexed,2=rgb,3=grey,+8=rle packed

	uint16_t colourmapstart;     // first colour map entry in palette
    uint16_t colourmaplength;    // number of colours in palette
    uint8_t  colourmapbits;      // number of bits per palette entry 15,16,24,32

    uint16_t xstart;             // image x origin
    uint16_t ystart;             // image y origin
    uint16_t width;              // image width in pixels
    uint16_t height;             // image height in pixels
    uint8_t  bits;               // image bits per pixel 8,16,24,32
    uint8_t  descriptor;         // image descriptor bits (vh flip bits)
    
    // pixel data follows header
} PACK_STRUCT;


#include "Compiler/poppack1.h"

// -----------------------------------------------------------------------------------
// Save a texture as bitmap
int SaveAsBMP (FILE* file, const aiTexel* data, unsigned int width, unsigned int height, bool SaveAlpha = false)
{
	if (!file || !data)return 1;

	const unsigned int numc = (SaveAlpha ? 4 : 3);
	unsigned char* buffer = new unsigned char[width*height*numc];

	for (unsigned int y = 0; y < height; ++y) {
		for (unsigned int x = 0; x < width; ++x) {

			unsigned char* s = &buffer[(y*width+x) * numc];
			const aiTexel* t = &data  [ y*width+x];
			s[0] = t->b;
			s[1] = t->g;
			s[2] = t->r;
			if (4 == numc)
				s[3] = t->a;
		}
	}

	BITMAPFILEHEADER header;
	header.bfType      = 'B' | (int('M') << 8u);
	header.bfOffBits   = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
	header.bfSize      = header.bfOffBits+width*height*numc;
	header.bfReserved1 = header.bfReserved2 = 0;

	fwrite(&header,sizeof(BITMAPFILEHEADER),1,file);

	BITMAPINFOHEADER info;
	info.biSize     = 40;
	info.biWidth    = width;
	info.biHeight   = height;
	info.biPlanes   = 1;
	info.biBitCount = numc<<3;
	info.biCompression = 0;
	info.biSizeImage   = width*height*numc;
	info.biXPelsPerMeter = 1; // dummy
	info.biYPelsPerMeter = 1; // dummy
	info.biClrUsed = 0;
	info.biClrImportant = 0;

	fwrite(&info,sizeof(BITMAPINFOHEADER),1,file);

	unsigned char* temp = buffer+info.biSizeImage;
	const unsigned int row = width*numc;

	for (int y = 0; temp -= row,y < info.biHeight;++y)	{
		fwrite(temp,row,1,file);
	}

	// delete the buffer
	delete[] buffer;
	return 0;
}

// -----------------------------------------------------------------------------------
// Save a texture as tga
int SaveAsTGA (FILE* file, const aiTexel* data, unsigned int width, unsigned int height)
{
	if (!file || !data)return 1;


	TGA_HEADER head = {0};
	head.bits   = 32;
	head.height = (uint16_t)height;
	head.width  = (uint16_t)width;
	head.descriptor |= (1u<<5);

	head.imagetype = 2; // actually it's RGBA
	fwrite(&head,sizeof(TGA_HEADER),1,file);

	for (unsigned int y = 0; y < height; ++y) {
		for (unsigned int x = 0; x < width; ++x) {
			fwrite(data + y*width+x,4,1,file);
		}
	}

	return 0;
}

// -----------------------------------------------------------------------------------
// Do the texture import for a given aiTexture
int DoExport(const aiTexture* tx, FILE* p, const std::string& extension,
	unsigned int flags) 
{
	// export the image to the appropriate decoder
	if (extension == "bmp") {
		SaveAsBMP(p,tx->pcData,tx->mWidth,tx->mHeight,
			(0 != (flags & AI_EXTRACT_WRITE_BMP_ALPHA)));
	}
	else if (extension == "tga") {
		SaveAsTGA(p,tx->pcData,tx->mWidth,tx->mHeight);
	}
	else {
		printf("assimp extract: No available texture encoder found for %s\n", extension.c_str());
		return 1;
	}
	return 0;
}

// -----------------------------------------------------------------------------------
// Implementation of the assimp extract utility
int Assimp_Extract (const char* const* params, unsigned int num)
{
	if (num < 1) {
		printf("assimp extract: Invalid number of arguments. See \'assimp extract --help\'\n");
		return 1;
	}

	// --help
	if (!strcmp( params[0], "-h") || !strcmp( params[0], "--help") || !strcmp( params[0], "-?") ) {
		printf("%s",AICMD_MSG_DUMP_HELP_E);
		return 0;
	}

	// asssimp extract in out [options]
	if (num < 1) {
		printf("assimp extract: Invalid number of arguments. See \'assimp extract --help\'\n");
		return 1;
	}

	std::string in  = std::string(params[0]);
	std::string out = (num > 1 ? std::string(params[1]) : "-");

	// get import flags
	ImportData import;
	ProcessStandardArguments(import,params+1,num-1);

	bool nosuffix = false;
	unsigned int texIdx  = 0xffffffff, flags = 0;

	// process other flags
	std::string extension = "bmp";
	for (unsigned int i = (out[0] == '-' ? 1 : 2); i < num;++i)		{
		if (!params[i])continue;

		if (!strncmp( params[i], "-f",2)) {
			extension = std::string(params[i]+2);
		}
		else if ( !strncmp( params[i], "--format=",9)) {
			extension = std::string(params[i]+9);
		}
		else if ( !strcmp( params[i], "--nosuffix") || !strcmp(params[i],"-s")) {
			nosuffix = true;
		}
		else if ( !strncmp( params[i], "--texture=",10)) {
			texIdx = ::strtol10(params[i]+10);
		}
		else if ( !strncmp( params[i], "-t",2)) {
			texIdx = ::strtol10(params[i]+2);
		}
		else if ( !strcmp( params[i], "-ba") ||  !strcmp( params[i], "--bmp-with-alpha")) {
			flags |= AI_EXTRACT_WRITE_BMP_ALPHA;
		}
#if 0
		else {
			printf("Unknown parameter: %s\n",params[i]);
			return 10;
		}
#endif
	}
	for (std::string::iterator it = extension.begin();it != extension.end();++it)
		*it = ::tolower(*it); 

	if (out[0] == '-') {
		// take file name from input file
		std::string::size_type s = in.find_last_of('.');
		if (s == std::string::npos)
			s = in.length();

		out = in.substr(0,s);
	}

	// take file extension from file name, if given
	std::string::size_type s = out.find_last_of('.');
	if (s != std::string::npos) {
		extension = out.substr(s+1,in.length()-(s+1));
		out = out.substr(0,s);
	}

	// import the main model
	const aiScene* scene = ImportModel(import,in);
	if (!scene) {
		printf("assimp extract: Unable to load input file %s\n",in.c_str());
		return 5;
	}

	// get the texture(s) to be exported
	if (texIdx != 0xffffffff) {

		// check whether the requested texture is existing
		if (texIdx >= scene->mNumTextures) {
			::printf("assimp extract: Texture %i requested, but there are just %i textures\n",
				texIdx, scene->mNumTextures);
			return 6;
		}
	}
	else {
		::printf("assimp extract: Exporting %i textures\n",scene->mNumTextures);
	}

	// now write all output textures
	for (unsigned int i = 0; i < scene->mNumTextures;++i)	{
		if (texIdx != 0xffffffff && texIdx != i) {
			continue;
		}

		const aiTexture* tex = scene->mTextures[i];
		std::string out_cpy = out, out_ext = extension;

		// append suffix if necessary - always if all textures are exported
		if (!nosuffix || (texIdx == 0xffffffff)) {
			out_cpy.append  ("_img");
			char tmp[10];
			ASSIMP_itoa10(tmp,i);

			out_cpy.append(std::string(tmp));
		}

		// if the texture is a compressed one, we'll export
		// it to its native file format
		if (!tex->mHeight) {
			printf("assimp extract: Texture %i is compressed (%s). Writing native file format.\n",
				i,tex->achFormatHint);

			// modify file extension
			out_ext = std::string(tex->achFormatHint);
		}
		out_cpy.append("."+out_ext);

		// open output file
		FILE* p = ::fopen(out_cpy.c_str(),"wb");
		if (!p)  {
			printf("assimp extract: Unable to open output file %s\n",out_cpy.c_str());
			return 7;
		}
		int m;

		if (!tex->mHeight) {
			m = (1 != fwrite(tex->pcData,tex->mWidth,1,p));
		}
		else m = DoExport(tex,p,extension,flags);
		::fclose(p);

		printf("assimp extract: Wrote texture %i to %s\n",i, out_cpy.c_str());
		if (texIdx != 0xffffffff)
			return m;
	}
	return 0;
}