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"
#include <assimp/fast_atof.h>
#include <assimp/StringComparison.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 omitted  \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 <assimp/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 <assimp/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;
    memset(&head, 0, sizeof(head));
    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)
{
    const char* const invalid = "assimp extract: Invalid number of arguments. See \'assimp extract --help\'\n";
    // assimp extract in out [options]
    if (num < 1) {
        printf(invalid);
        return 1;
    }

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



    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 = Assimp::strtoul10(params[i]+10);
        }
        else if ( !strncmp( params[i], "-t",2)) {
            texIdx = Assimp::strtoul10(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
    }

    std::transform(extension.begin(),extension.end(),extension.begin(),::tolower);
    
    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::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;
}