C++ (Cpp) bitmap::get_width Beispiele

Beispiel #1

Datei: main.cpp Projekt: godexsoft/x2d

void generator::save_image(const bitmap& bm)
{
    FILE* fp = fopen(string(font_name_ + ".png").c_str(), "wb");
    if(!fp)
    {
        throw runtime_error("Can't open png output file.");
    }
    
    png_structp png_ptr = NULL;
    png_infop info_ptr = NULL;
    png_byte ** row_pointers = NULL;
    
    int status = -1;
    
    int pixel_size = 4;
    int depth = 8;
    
    png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (png_ptr == NULL)
    {
        throw runtime_error("Can't open png output structure.");
    }
    
    info_ptr = png_create_info_struct (png_ptr);
    if (info_ptr == NULL)
    {
        throw runtime_error("Can't create png info struct.");
    }
    
    png_set_IHDR (png_ptr, info_ptr, bm.get_width(), bm.get_height(), depth,
        PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE,
        PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
    
    row_pointers = static_cast<png_byte**>(png_malloc (png_ptr, bm.get_height() * sizeof (png_byte *)));

    for (uint32_t y = 0; y < bm.get_height(); ++y)
    {
        png_byte *row =
            static_cast<png_byte*>(png_malloc (png_ptr, sizeof (uint8_t) * bm.get_width() * pixel_size));
        row_pointers[y] = row;
        for (uint32_t x = 0; x < bm.get_width(); ++x) {
            pixel p = bm.get_pixel(x, y);
            *row++ = p.red;
            *row++ = p.green;
            *row++ = p.blue;
            *row++ = p.alpha;
        }
    }
    
    png_init_io (png_ptr, fp);
    png_set_rows (png_ptr, info_ptr, row_pointers);
    png_write_png (png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
    
    status = 0;
    
    for (size_t y = 0; y < bm.get_height(); y++) {
        png_free (png_ptr, row_pointers[y]);
    }
    
    png_free (png_ptr, row_pointers);
    
    png_destroy_write_struct (&png_ptr, &info_ptr);
    fclose (fp);
}