Function preProcessImageToCache

tools/aapt/Images.cpp:1363–1488

}

status_t preProcessImageToCache(const Bundle* bundle, const String8& source, const String8& dest)
{
    png_structp read_ptr = NULL;
    png_infop read_info = NULL;

    FILE* fp;

    image_info imageInfo;

    png_structp write_ptr = NULL;
    png_infop write_info = NULL;

    status_t error = UNKNOWN_ERROR;

    if (bundle->getVerbose()) {
        printf("Processing image to cache: %s => %s\n", source.string(), dest.string());
    }

    // Get a file handler to read from
    fp = fopen(source.string(),"rb");
    if (fp == NULL) {
        fprintf(stderr, "%s ERROR: Unable to open PNG file\n", source.string());
        return error;
    }

    // Call libpng to get a struct to read image data into
    read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (!read_ptr) {
        fclose(fp);
        png_destroy_read_struct(&read_ptr, &read_info,NULL);
        return error;
    }

    // Call libpng to get a struct to read image info into
    read_info = png_create_info_struct(read_ptr);
    if (!read_info) {
        fclose(fp);
        png_destroy_read_struct(&read_ptr, &read_info,NULL);
        return error;
    }

    // Set a jump point for libpng to long jump back to on error
    if (setjmp(png_jmpbuf(read_ptr))) {
        fclose(fp);
        png_destroy_read_struct(&read_ptr, &read_info,NULL);
        return error;
    }

    // Set up libpng to read from our file.
    png_init_io(read_ptr,fp);

    // Actually read data from the file
    read_png(source.string(), read_ptr, read_info, &imageInfo);

    // We're done reading so we can clean up
    // Find old file size before releasing handle
    fseek(fp, 0, SEEK_END);
    size_t oldSize = (size_t)ftell(fp);