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graphics/jpgresizetool: Add libjpeg resize tool

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Add a libjpeg based JPEG resize tool.
Simple resizer that can resize JPEGs using
"jpgresize input.jpg output.jpg scale_denom(1,2,4,8) quality%".
Tries to use little memory by scanning per line.

Signed-off-by: Kevin Witteveen (MartiniMarter) <kevinwit1999@gmail.com>
This commit is contained in:
Kevin Witteveen (MartiniMarter) 2025-07-25 20:11:54 +02:00 • committed by Xiang Xiao
parent 4ffed5d6dc
commit 452ae235c6
5 changed files with 303 additions and 0 deletions
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33
graphics/jpgresizetool/CMakeLists.txt Normal file
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# ##############################################################################
# apps/graphics/jpgresizetool/CMakeLists.txt
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more contributor
# license agreements. See the NOTICE file distributed with this work for
# additional information regarding copyright ownership. The ASF licenses this
# file to you under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
#
# ##############################################################################
if(CONFIG_GRAPHICS_JPGRESIZETOOL)
nuttx_add_application(
NAME
jpgresize
STACKSIZE
4096
MODULE
${CONFIG_GRAPHICS_JPGRESIZETOOL}
SRCS
resize.c)
endif()

11
graphics/jpgresizetool/Kconfig Normal file
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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config GRAPHICS_JPGRESIZETOOL
bool "JPGResizeTool"
default n
depends on libjpeg
---help---
Libjpeg JPEG resizer

25
graphics/jpgresizetool/Make.defs Normal file
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############################################################################
# apps/graphics/jpgresizetool/Make.defs
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
############################################################################
ifneq ($(CONFIG_GRAPHICS_JPGRESIZETOOL),)
CONFIGURED_APPS += $(APPDIR)/graphics/jpgresizetool
endif

34
graphics/jpgresizetool/Makefile Normal file
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############################################################################
# apps/graphics/jpgresizetool/Makefile
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
############################################################################
include $(APPDIR)/Make.defs
MAINSRC = resize.c
# built-in application info
PROGNAME = jpgresize
PRIORITY = SCHED_PRIORITY_DEFAULT
STACKSIZE = 4096
MODULE = $(CONFIG_GRAPHICS_JPGRESIZETOOL)
include $(APPDIR)/Application.mk

200
graphics/jpgresizetool/resize.c Normal file
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/****************************************************************************
* apps/graphics/jpgresizetool/resize.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <jpeglib.h>
/****************************************************************************
* Definitions
****************************************************************************/
/* Every N line, report resizing progress */
#define JPEGRESIZE_PROGRESS_INTERVAL 40
/****************************************************************************
* Public Functions
****************************************************************************/
/* Usage: jpgresize input.jpg output.jpg scale_denom quality%
* scale_denom: 1, 2, 4, 8. Shrinks image by scale_denom times.
* quality: 1% to 100%. 20% heavy compression, 80% nearly original.
* thumbnail example:
* jpgresize /sd/IMAGES/000000a1.jpg /sd/TEMP/THUMBS/000000a1.jpg 8 20
*/
int main(int argc, char *argv[])
{
struct jpeg_compress_struct cinfo_out;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr_out;
struct jpeg_error_mgr jerr;
const char *output_filename;
const char *input_filename;
uint8_t togglechar;
JSAMPARRAY buffer;
FILE *outfile;
FILE *infile;
int scale_denom;
int pixel_size;
int quality;
int height;
int width;
/* Take arguments */
if (argc != 5)
{
fprintf(stderr,
"Usage: %s input.jpg output.jpg scale_denom(1, 2, 4, 8) quality%%\n",
argv[0]);
return -1;
}
scale_denom = atoi(argv[3]);
if (scale_denom != 1 && scale_denom != 2 && scale_denom != 4 &&
scale_denom != 8 && scale_denom != 16)
{
fprintf(stderr, "scale_denom must be 1, 2, 4 or 8\n");
return -1;
}
input_filename = argv[1];
output_filename = argv[2];
quality = atoi(argv[4]);
/* Opening input */
infile = fopen(input_filename, "rb");
if (!infile)
{
perror("fopen input");
return -1;
}
/* Configuring decompressor */
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
cinfo.scale_num = 1;
cinfo.scale_denom = scale_denom;
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
pixel_size = cinfo.output_components;
/* Opening output */
outfile = fopen(output_filename, "wb");
if (!outfile)
{
perror("fopen output");
jpeg_destroy_decompress(&cinfo);
fclose(infile);
return -1;
}
/* Configuring compressor */
cinfo_out.err = jpeg_std_error(&jerr_out);
jpeg_create_compress(&cinfo_out);
jpeg_stdio_dest(&cinfo_out, outfile);
cinfo_out.image_width = width;
cinfo_out.image_height = height;
cinfo_out.input_components = pixel_size;
cinfo_out.in_color_space = cinfo.out_color_space;
jpeg_set_defaults(&cinfo_out);
jpeg_set_quality(&cinfo_out, quality, TRUE);
jpeg_start_compress(&cinfo_out, TRUE);
/* Allocating memory by using JPEG their own allocator. Do not use malloc */
printf("Allocating... \r");
buffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr)&cinfo, JPOOL_IMAGE, width * pixel_size, 1);
/* Start the job */
printf("Resizing... \n");
togglechar = 0;
while (cinfo.output_scanline < cinfo.output_height)
{
/* Pretty loading bar... */
if (cinfo.output_scanline % JPEGRESIZE_PROGRESS_INTERVAL == 1)
{
printf("\r[%u%%]",
(unsigned)(((float)cinfo.output_scanline
/ cinfo.output_height)
* 100));
togglechar = !togglechar;
}
if (togglechar)
{
printf("-");
}
else
{
printf("#");
}
fflush(stdout);
/* Actual work */
jpeg_read_scanlines(&cinfo, buffer, 1);
jpeg_write_scanlines(&cinfo_out, buffer, 1);
}
/* Erase progress bar */
printf("\r ");
for (size_t i = 0; i < JPEGRESIZE_PROGRESS_INTERVAL; i++)
{
printf(" ");
}
/* All done */
printf("\rDone\n");
jpeg_finish_compress(&cinfo_out);
jpeg_destroy_compress(&cinfo_out);
fclose(outfile);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
printf("Resized JPEG written to %s\n", output_filename);
return 0;
}