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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed 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 <errno.h>
#include <setjmp.h>
#include <stdio.h>
extern "C" {
#include "jpeglib.h"
}
static inline uint8_t from565to8(uint16_t p, int start, int bits) {
uint8_t c = (p >> start) & ((1 << bits) - 1);
return (c << (8 - bits)) | (c >> (bits - (8 - bits)));
}
struct sf_jpeg_error_mgr {
struct jpeg_error_mgr jerr;
jmp_buf longjmp_buffer;
};
void sf_jpeg_error_exit(j_common_ptr cinfo) {
struct sf_jpeg_error_mgr *sf_err = (struct sf_jpeg_error_mgr *)cinfo->err;
longjmp(sf_err->longjmp_buffer, 0);
}
int writeJpegFile(const char *filename, uint8_t *frame, int width, int height) {
struct sf_jpeg_error_mgr sf_err;
struct jpeg_compress_struct cinfo;
uint8_t row_data[width * 3];
JSAMPROW row_pointer = row_data;
FILE *f;
f = fopen(filename, "w");
if (!f) {
return -errno;
}
cinfo.err = jpeg_std_error(&sf_err.jerr);
sf_err.jerr.error_exit = sf_jpeg_error_exit;
if (setjmp(sf_err.longjmp_buffer)) {
jpeg_destroy_compress(&cinfo);
fclose(f);
return -1;
}
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, f);
cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, 80, TRUE);
jpeg_start_compress(&cinfo, TRUE);
for (int row = 0; row < height; row++) {
uint16_t *src = (uint16_t *)(frame + row * width * 2);
uint8_t *dst = row_data;
for (int col = 0; col < width; col++) {
dst[0] = from565to8(*src, 11, 5);
dst[1] = from565to8(*src, 5, 6);
dst[2] = from565to8(*src, 0, 5);
dst += 3;
src++;
}
jpeg_write_scanlines(&cinfo, &row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
fclose(f);
return 0;
}
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