C++ (Cpp) rwpng_write_image_init示例

示例#1

文件： rwpng.c 项目： Troland/improved-pngquant

pngquant_error rwpng_write_image8(FILE *outfile, png8_image *mainprog_ptr)
{
    png_structp png_ptr;
    png_infop info_ptr;

    pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
    if (retval) return retval;

    /* set the image parameters appropriately */
    int sample_depth;
    if (mainprog_ptr->num_palette <= 2)
        sample_depth = 1;
    else if (mainprog_ptr->num_palette <= 4)
        sample_depth = 2;
    else if (mainprog_ptr->num_palette <= 16)
        sample_depth = 4;
    else
        sample_depth = 8;

    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
      sample_depth, PNG_COLOR_TYPE_PALETTE,
      0, PNG_COMPRESSION_TYPE_DEFAULT,
      PNG_FILTER_TYPE_BASE);

    png_set_PLTE(png_ptr, info_ptr, &mainprog_ptr->palette[0], mainprog_ptr->num_palette);

    if (mainprog_ptr->num_trans > 0)
        png_set_tRNS(png_ptr, info_ptr, mainprog_ptr->trans, mainprog_ptr->num_trans, NULL);

    rwpng_write_end(&info_ptr, &png_ptr, (png_image*)mainprog_ptr);

    return SUCCESS;
}

示例#2

文件： rwpng.c 项目： AviTapp/pngquant

pngquant_error rwpng_write_image8(FILE *outfile, png8_image *mainprog_ptr)
{
    png_structp png_ptr;
    png_infop info_ptr;

    pngquant_error retval = rwpng_write_image_init((rwpng_png_image*)mainprog_ptr, &png_ptr, &info_ptr, mainprog_ptr->fast_compression);
    if (retval) return retval;

    struct rwpng_write_data write_data;
    if (mainprog_ptr->maximum_file_size) {
        write_data = (struct rwpng_write_data){
            .buffer = malloc(mainprog_ptr->maximum_file_size),
            .bytes_left = mainprog_ptr->maximum_file_size,
        };
        if (!write_data.buffer) return PNG_OUT_OF_MEMORY_ERROR;
        png_set_write_fn(png_ptr, &write_data, user_write_data, user_flush_data);
    } else {

示例#3

文件： rwpng.c 项目： Troland/improved-pngquant

pngquant_error rwpng_write_image24(FILE *outfile, png24_image *mainprog_ptr)
{
    png_structp png_ptr;
    png_infop info_ptr;

    pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
    if (retval) return retval;

    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
                 8, PNG_COLOR_TYPE_RGB_ALPHA,
                 0, PNG_COMPRESSION_TYPE_DEFAULT,
                 PNG_FILTER_TYPE_BASE);


    rwpng_write_end(&info_ptr, &png_ptr, (png_image*)mainprog_ptr);

    return SUCCESS;
}

示例#4

文件： rwpng.c 项目： andreydobrikov/improved-pngquant

pngquant_error rwpng_write_image8(FILE *outfile, png8_image *mainprog_ptr)
{
    png_structp png_ptr;
    png_infop info_ptr;

    pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
    if (retval) return retval;

    // Palette images generally don't gain anything from filtering
    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);

    rwpng_set_gamma(info_ptr, png_ptr, mainprog_ptr->gamma);

    /* set the image parameters appropriately */
    int sample_depth;
    if (mainprog_ptr->num_palette <= 2)
        sample_depth = 1;
    else if (mainprog_ptr->num_palette <= 4)
        sample_depth = 2;
    else if (mainprog_ptr->num_palette <= 16)
        sample_depth = 4;
    else
        sample_depth = 8;

    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
      sample_depth, PNG_COLOR_TYPE_PALETTE,
      0, PNG_COMPRESSION_TYPE_DEFAULT,
      PNG_FILTER_TYPE_BASE);

    png_set_PLTE(png_ptr, info_ptr, &mainprog_ptr->palette[0], mainprog_ptr->num_palette);

    if (mainprog_ptr->num_trans > 0)
        png_set_tRNS(png_ptr, info_ptr, mainprog_ptr->trans, mainprog_ptr->num_trans, NULL);


    png_bytepp row_pointers = rwpng_create_row_pointers(info_ptr, png_ptr, mainprog_ptr->indexed_data, mainprog_ptr->height, mainprog_ptr->width);

    rwpng_write_end(&info_ptr, &png_ptr, row_pointers);

    free(row_pointers);

    return SUCCESS;
}

示例#5

文件： pngquant.c 项目： UnderCooled/improved-pngquant

pngquant_error write_image(write_info *output_image,const char *filename,const char *newext,int force,int using_stdin)
{
    FILE *outfile;
    if (using_stdin) {
        set_binary_mode(stdout);
        outfile = stdout;
    } else {
        char *outname = add_filename_extension(filename,newext);

        if (!force) {
            if ((outfile = fopen(outname, "rb")) != NULL) {
                fprintf(stderr, "  error:  %s exists; not overwriting\n", outname);
                fclose(outfile);
                free(outname);
                return NOT_OVERWRITING_ERROR;
            }
        }
        if ((outfile = fopen(outname, "wb")) == NULL) {
            fprintf(stderr, "  error:  cannot open %s for writing\n", outname);
            free(outname);
            return CANT_WRITE_ERROR;
        }
        free(outname);
    }

    pngquant_error retval = rwpng_write_image_init(outfile, output_image);
    if (retval) {
        fprintf(stderr, "  rwpng_write_image_init() error\n");
        if (!using_stdin)
            fclose(outfile);
        return retval;
    }

    /* write entire interlaced palette PNG */
    retval = rwpng_write_image_whole(output_image);

    if (!using_stdin)
        fclose(outfile);

    /* now we're done with the OUTPUT data and row_pointers, too */
    return retval;
}

示例#6

文件： rwpng.c 项目： andreydobrikov/improved-pngquant

pngquant_error rwpng_write_image24(FILE *outfile, png24_image *mainprog_ptr)
{
    png_structp png_ptr;
    png_infop info_ptr;

    pngquant_error retval = rwpng_write_image_init((png_image*)mainprog_ptr, &png_ptr, &info_ptr, outfile);
    if (retval) return retval;

    rwpng_set_gamma(info_ptr, png_ptr, mainprog_ptr->gamma);

    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
                 8, PNG_COLOR_TYPE_RGB_ALPHA,
                 0, PNG_COMPRESSION_TYPE_DEFAULT,
                 PNG_FILTER_TYPE_BASE);


    png_bytepp row_pointers = rwpng_create_row_pointers(info_ptr, png_ptr, mainprog_ptr->rgba_data, mainprog_ptr->height, 0);

    rwpng_write_end(&info_ptr, &png_ptr, row_pointers);

    free(row_pointers);

    return SUCCESS;
}