示例#1
0
文件: xpsjxr.c 项目: hackqiang/gs
int
xps_decode_jpegxr(xps_context_t *ctx, byte *buf, int len, xps_image_t *output)
{
    FILE *file;
    char *name = xps_alloc(ctx, gp_file_name_sizeof);
    struct state state;
    jxr_container_t container;
    jxr_image_t image;
    int offset, alpha_offset;
    int rc;

    if (!name) {
        return gs_throw(gs_error_VMerror, "cannot allocate scratch file name buffer");
    }

    memset(output, 0, sizeof(*output));

    file = gp_open_scratch_file(ctx->memory, "jpegxr-scratch-", name, "wb+");
    if (!file) {
        xps_free(ctx, name);
        return gs_throw(gs_error_invalidfileaccess, "cannot open scratch file");
    }
    rc = fwrite(buf, 1, len, file);
    if (rc != len) {
        xps_free(ctx, name);
        return gs_throw(gs_error_invalidfileaccess, "cannot write to scratch file");
    }
    fseek(file, 0, SEEK_SET);

    container = jxr_create_container();
    rc = jxr_read_image_container(container, file);
    if (rc < 0) {
        xps_free(ctx, name);
        return gs_throw1(-1, "jxr_read_image_container: %s", jxr_error_string(rc));
    }

    offset = jxrc_image_offset(container, 0);
    alpha_offset = jxrc_alpha_offset(container, 0);

    output->xres = jxrc_width_resolution(container, 0);
    output->yres = jxrc_height_resolution(container, 0);

    image = jxr_create_input();
    jxr_set_PROFILE_IDC(image, 111);
    jxr_set_LEVEL_IDC(image, 255);
    jxr_set_pixel_format(image, jxrc_image_pixelformat(container, 0));
    jxr_set_container_parameters(image,
        jxrc_image_pixelformat(container, 0),
        jxrc_image_width(container, 0),
        jxrc_image_height(container, 0),
        jxrc_alpha_offset(container, 0),
        jxrc_image_band_presence(container, 0),
        jxrc_alpha_band_presence(container, 0), 0);

    jxr_set_block_output(image, xps_decode_jpegxr_block);
    state.ctx = ctx;
    state.output = output;
    jxr_set_user_data(image, &state);

    fseek(file, offset, SEEK_SET);
    rc = jxr_read_image_bitstream(image, file);
    if (rc < 0) {
        xps_free(ctx, name);
        return gs_throw1(-1, "jxr_read_image_bitstream: %s", jxr_error_string(rc));
    }

    jxr_destroy(image);

    if (alpha_offset > 0)
    {
        image = jxr_create_input();
        jxr_set_PROFILE_IDC(image, 111);
        jxr_set_LEVEL_IDC(image, 255);
        jxr_set_pixel_format(image, jxrc_image_pixelformat(container, 0));
        jxr_set_container_parameters(image,
            jxrc_image_pixelformat(container, 0),
            jxrc_image_width(container, 0),
            jxrc_image_height(container, 0),
            jxrc_alpha_offset(container, 0),
            jxrc_image_band_presence(container, 0),
            jxrc_alpha_band_presence(container, 0), 0);

        jxr_set_block_output(image, xps_decode_jpegxr_alpha_block);
        state.ctx = ctx;
        state.output = output;
        jxr_set_user_data(image, &state);

        fseek(file, alpha_offset, SEEK_SET);
        rc = jxr_read_image_bitstream(image, file);
        if (rc < 0) {
            xps_free(ctx, name);
            return gs_throw1(-1, "jxr_read_image_bitstream: %s", jxr_error_string(rc));
        }

        jxr_destroy(image);
    }

    jxr_destroy_container(container);

    fclose(file);
    unlink(name);
    xps_free(ctx, name);

    return gs_okay;
}
示例#2
0
文件: load-jxr.c 项目: ccxvii/mupdf
static void
jxr_read_image(fz_context *ctx, unsigned char *data, int size, struct info *info, int only_metadata)
{
	jxr_container_t container;
	jxr_image_t image = NULL;
	jxr_image_t alpha = NULL;
	int rc, i;

	fz_try(ctx)
	{
		container = jxr_create_container();

		rc = jxr_read_image_container_memory(container, data, size);
		if (rc < 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot read jxr image container: %s", jxr_error_string(rc));

		info->xres = jxrc_width_resolution(container, 0);
		info->yres = jxrc_height_resolution(container, 0);
		info->width = jxrc_image_width(container, 0);
		info->height = jxrc_image_height(container, 0);

		info->format = jxrc_image_pixelformat(container, 0);

		for (i = 0; i < nelem(pixelformats); i++)
			if (pixelformats[i].format == info->format)
			{
				info->comps = pixelformats[i].comps;
				break;
			}
		if (i == nelem(pixelformats))
			fz_throw(ctx, FZ_ERROR_GENERIC, "unsupported pixel format: %u", info->format);

		if (info->comps == 1)
			info->cspace = fz_device_gray(ctx);
		else if (info->comps == 3)
			info->cspace = fz_device_rgb(ctx);
		else if (info->comps >= 4)
			info->cspace = fz_device_cmyk(ctx);

		info->stride = info->width * (fz_colorspace_n(ctx, info->cspace) + 1);

		if (!only_metadata)
		{
			unsigned long image_offset;
			unsigned char image_band;
			unsigned long alpha_offset;
			unsigned char alpha_band;

			info->ctx = ctx;
			info->samples = fz_malloc(ctx, info->stride * info->height);
			memset(info->samples, 0xff, info->stride * info->height);

			image_offset = jxrc_image_offset(container, 0);
			image_band = jxrc_image_band_presence(container, 0);
			alpha_offset = jxrc_alpha_offset(container, 0);
			alpha_band = jxrc_alpha_band_presence(container, 0);

			image = jxr_create_input();

			jxr_set_PROFILE_IDC(image, 111);
			jxr_set_LEVEL_IDC(image, 255);
			jxr_set_pixel_format(image, info->format);
			jxr_set_container_parameters(image, info->format,
				info->width, info->height, alpha_offset,
				image_band, alpha_band, 0);

			jxr_set_user_data(image, info);
			jxr_set_block_output(image, jxr_decode_block);

			rc = jxr_read_image_bitstream_memory(image, data + image_offset, size - image_offset);
			if (rc < 0)
				fz_throw(ctx, FZ_ERROR_GENERIC, "cannot read jxr image: %s", jxr_error_string(rc));

			if (info->format == JXRC_FMT_32bppPBGRA ||
					info->format == JXRC_FMT_64bppPRGBA ||
					info->format == JXRC_FMT_128bppPRGBAFloat)
				info->has_premul = 1;

			if (jxr_get_ALPHACHANNEL_FLAG(image))
				info->has_alpha = 1;

			if (alpha_offset > 0)
			{
				info->has_alpha = 1;

				alpha = jxr_create_input();

				jxr_set_PROFILE_IDC(alpha, 111);
				jxr_set_LEVEL_IDC(alpha, 255);
				jxr_set_pixel_format(alpha, info->format);
				jxr_set_container_parameters(alpha, info->format,
					info->width, info->height, alpha_offset,
					image_band, alpha_band, 1);

				jxr_set_user_data(alpha, info);
				jxr_set_block_output(alpha, jxr_decode_block_alpha);

				rc = jxr_read_image_bitstream_memory(alpha, data + alpha_offset, size - alpha_offset);
				if (rc < 0)
					fz_throw(ctx, FZ_ERROR_GENERIC, "cannot read jxr image: %s", jxr_error_string(rc));
			}
		}
	}
	fz_always(ctx)
	{
		if (alpha)
			jxr_destroy(alpha);
		if (image)
			jxr_destroy(image);
		jxr_destroy_container(container);
	}
	fz_catch(ctx)
	{
		fz_rethrow(ctx);
	}
}