rt-thread-official/components/rtgui/common/image_jpg.c

479 lines
12 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include "jpeg/jpeglib.h"
#include <rtthread.h>
#include <rtgui/rtgui.h>
#include <rtgui/rtgui_system.h>
#include <rtgui/filerw.h>
#include <rtgui/image_jpeg.h>
static rt_bool_t rtgui_image_jpeg_check(struct rtgui_filerw* file);
static rt_bool_t rtgui_image_jpeg_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
static void rtgui_image_jpeg_unload(struct rtgui_image* image);
static void rtgui_image_jpeg_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
struct rtgui_jpeg_error_mgr
{
struct jpeg_error_mgr pub; /* "public" fields */
};
struct rtgui_image_jpeg
{
rt_bool_t is_loaded;
struct rtgui_filerw* filerw;
/* jpeg structure */
struct jpeg_decompress_struct cinfo;
struct rtgui_jpeg_error_mgr errmgr;
rt_uint8_t *pixels;
rt_uint8_t *line_pixels;
};
struct rtgui_image_engine rtgui_image_jpeg_engine =
{
"jpeg",
{RT_NULL},
rtgui_image_jpeg_check,
rtgui_image_jpeg_load,
rtgui_image_jpeg_unload,
rtgui_image_jpeg_blit
};
#define INPUT_BUFFER_SIZE 4096
typedef struct {
struct jpeg_source_mgr pub;
struct rtgui_filerw* ctx;
rt_uint8_t buffer[INPUT_BUFFER_SIZE];
} rtgui_jpeg_source_mgr;
/*
* Initialize source --- called by jpeg_read_header
* before any data is actually read.
*/
static void init_source (j_decompress_ptr cinfo)
{
/* We don't actually need to do anything */
return;
}
/*
* Fill the input buffer --- called whenever buffer is emptied.
*/
static boolean fill_input_buffer (j_decompress_ptr cinfo)
{
rtgui_jpeg_source_mgr * src = (rtgui_jpeg_source_mgr *) cinfo->src;
int nbytes;
nbytes = rtgui_filerw_read(src->ctx, src->buffer, 1, INPUT_BUFFER_SIZE);
if (nbytes <= 0)
{
/* Insert a fake EOI marker */
src->buffer[0] = (rt_uint8_t) 0xFF;
src->buffer[1] = (rt_uint8_t) JPEG_EOI;
nbytes = 2;
}
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = nbytes;
return TRUE;
}
/*
* Skip data --- used to skip over a potentially large amount of
* uninteresting data (such as an APPn marker).
*
* Writers of suspendable-input applications must note that skip_input_data
* is not granted the right to give a suspension return. If the skip extends
* beyond the data currently in the buffer, the buffer can be marked empty so
* that the next read will cause a fill_input_buffer call that can suspend.
* Arranging for additional bytes to be discarded before reloading the input
* buffer is the application writer's problem.
*/
static void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
rtgui_jpeg_source_mgr * src = (rtgui_jpeg_source_mgr *) cinfo->src;
/* Just a dumb implementation for now. Could use fseek() except
* it doesn't work on pipes. Not clear that being smart is worth
* any trouble anyway --- large skips are infrequent.
*/
if (num_bytes > 0)
{
while (num_bytes > (long) src->pub.bytes_in_buffer)
{
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) src->pub.fill_input_buffer(cinfo);
/* note we assume that fill_input_buffer will never
* return FALSE, so suspension need not be handled.
*/
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
/*
* Terminate source --- called by jpeg_finish_decompress
* after all data has been read.
*/
static void term_source (j_decompress_ptr cinfo)
{
/* We don't actually need to do anything */
return;
}
/*
* Prepare for input from a stdio stream.
* The caller must have already opened the stream, and is responsible
* for closing it after finishing decompression.
*/
static void rtgui_jpeg_filerw_src_init(j_decompress_ptr cinfo, struct rtgui_filerw *ctx)
{
rtgui_jpeg_source_mgr *src;
/* The source object and input buffer are made permanent so that a series
* of JPEG images can be read from the same file by calling jpeg_stdio_src
* only before the first one. (If we discarded the buffer at the end of
* one image, we'd likely lose the start of the next one.)
* This makes it unsafe to use this manager and a different source
* manager serially with the same JPEG object. Caveat programmer.
*/
if (cinfo->src == NULL) { /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(rtgui_jpeg_source_mgr));
src = (rtgui_jpeg_source_mgr *) cinfo->src;
}
src = (rtgui_jpeg_source_mgr *) cinfo->src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = term_source;
src->ctx = ctx;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
}
/* get line data of a jpeg image */
static rt_uint8_t *rtgui_image_get_line(struct rtgui_image* image, int h)
{
struct rtgui_image_jpeg* jpeg;
rt_uint8_t *result_ptr;
JSAMPARRAY buffer; /* Output row buffer */
int row_stride;
RT_ASSERT(image != RT_NULL);
jpeg = (struct rtgui_image_jpeg*) image->data;
RT_ASSERT(jpeg != RT_NULL);
if (h < 0 || h > image->h) return RT_NULL;
/* if the image is loaded, */
if (jpeg->is_loaded == RT_TRUE)
{
result_ptr = jpeg->pixels + (image->w * sizeof(rtgui_color_t)) * h;
return result_ptr;
}
if (jpeg->line_pixels == RT_NULL)
jpeg->line_pixels = rtgui_malloc(image->w * sizeof(rtgui_color_t));
row_stride = jpeg->cinfo.output_width * jpeg->cinfo.output_components;
buffer = (*jpeg->cinfo.mem->alloc_sarray)
((j_common_ptr) &jpeg->cinfo, JPOOL_IMAGE, row_stride, 1);
/* decompress line data */
jpeg->cinfo.output_scanline = h;
jpeg_read_scanlines(&jpeg->cinfo, buffer, (JDIMENSION) 1);
/* copy pixels memory */
{
int index;
rtgui_color_t *ptr;
ptr = (rtgui_color_t*)jpeg->line_pixels;
for (index = 0; index < image->w; index ++)
ptr[index] = RTGUI_ARGB(0, buffer[0][index*3], buffer[0][index*3+1], buffer[0][index*3+2]);
}
return jpeg->line_pixels;
}
static rt_bool_t rtgui_image_jpeg_loadall(struct rtgui_image* image)
{
struct rtgui_image_jpeg* jpeg;
rt_uint8_t* line_ptr;
JSAMPARRAY buffer; /* Output row buffer */
int row_stride;
jpeg = (struct rtgui_image_jpeg*) image->data;
RT_ASSERT(jpeg != RT_NULL);
/* already load */
if (jpeg->pixels != RT_NULL) return RT_TRUE;
/* allocate all pixels */
jpeg->pixels = rtgui_malloc(image->h * image->w * sizeof(rtgui_color_t));
if (jpeg->pixels == RT_NULL) return RT_FALSE;
/* reset scan line to zero */
jpeg->cinfo.output_scanline = 0;
line_ptr = jpeg->pixels;
row_stride = jpeg->cinfo.output_width * jpeg->cinfo.output_components;
buffer = (*jpeg->cinfo.mem->alloc_sarray)
((j_common_ptr) &jpeg->cinfo, JPOOL_IMAGE, row_stride, 1);
/* decompress all pixels */
while (jpeg->cinfo.output_scanline < jpeg->cinfo.output_height)
{
/* jpeg_read_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could ask for
* more than one scanline at a time if that's more convenient.
*/
(void) jpeg_read_scanlines(&jpeg->cinfo, buffer, 1);
/* copy pixels memory */
{
int index;
rtgui_color_t *ptr;
ptr = (rtgui_color_t*)line_ptr;
for (index = 0; index < image->w; index ++)
ptr[index] = RTGUI_ARGB(0, buffer[0][index*3], buffer[0][index*3+1], buffer[0][index*3+2]);
}
/* move to next line */
line_ptr += image->w * sizeof(rtgui_color_t);
}
/* decompress done */
rtgui_filerw_close(jpeg->filerw);
jpeg_finish_decompress(&jpeg->cinfo);
jpeg->is_loaded = RT_TRUE;
return RT_TRUE;
}
void rtgui_image_jpeg_init()
{
/* register jpeg on image system */
rtgui_image_register_engine(&rtgui_image_jpeg_engine);
}
static void my_error_exit(j_common_ptr cinfo)
{
}
static void output_no_message(j_common_ptr cinfo)
{
/* do nothing */
}
static rt_bool_t rtgui_image_jpeg_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
{
struct rtgui_image_jpeg* jpeg;
jpeg = (struct rtgui_image_jpeg*) rtgui_malloc(sizeof(struct rtgui_image_jpeg));
if (jpeg == RT_NULL) return RT_FALSE;
jpeg->filerw = file;
/* read file header */
/* Create a decompression structure and load the JPEG header */
jpeg->cinfo.err = jpeg_std_error(&jpeg->errmgr.pub);
jpeg->errmgr.pub.error_exit = my_error_exit;
jpeg->errmgr.pub.output_message = output_no_message;
jpeg_create_decompress(&jpeg->cinfo);
rtgui_jpeg_filerw_src_init(&jpeg->cinfo, jpeg->filerw);
(void)jpeg_read_header(&jpeg->cinfo, TRUE);
image->w = jpeg->cinfo.image_width;
image->h = jpeg->cinfo.image_height;
/* set image private data and engine */
image->data = jpeg;
image->engine = &rtgui_image_jpeg_engine;
/* start decompression */
(void) jpeg_start_decompress(&jpeg->cinfo);
jpeg->cinfo.out_color_space = JCS_RGB;
jpeg->cinfo.quantize_colors = FALSE;
/* use fast jpeg */
jpeg->cinfo.scale_num = 1;
jpeg->cinfo.scale_denom = 1;
jpeg->cinfo.dct_method = JDCT_FASTEST;
jpeg->cinfo.do_fancy_upsampling = FALSE;
jpeg->pixels = RT_NULL;
jpeg->is_loaded = RT_FALSE;
/* allocate line pixels */
jpeg->line_pixels = rtgui_malloc(image->w * sizeof(rtgui_color_t));
if (jpeg->line_pixels == RT_NULL)
{
/* no memory */
jpeg_finish_decompress(&jpeg->cinfo);
rt_free(jpeg);
return RT_FALSE;
}
if (load == RT_TRUE) rtgui_image_jpeg_loadall(image);
/* create jpeg image successful */
return RT_TRUE;
}
static void rtgui_image_jpeg_unload(struct rtgui_image* image)
{
if (image != RT_NULL)
{
struct rtgui_image_jpeg* jpeg;
jpeg = (struct rtgui_image_jpeg*) image->data;
RT_ASSERT(jpeg != RT_NULL);
if (jpeg->is_loaded == RT_TRUE)
rtgui_free(jpeg->pixels);
if (jpeg->line_pixels != RT_NULL) rtgui_free(jpeg->line_pixels);
if (jpeg->is_loaded != RT_TRUE)
{
rtgui_filerw_close(jpeg->filerw);
jpeg_finish_decompress(&jpeg->cinfo);
}
rt_free(jpeg);
}
}
static void rtgui_image_jpeg_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect)
{
rt_uint16_t x, y;
rtgui_color_t* ptr;
struct rtgui_image_jpeg* jpeg;
RT_ASSERT(image != RT_NULL && dc != RT_NULL && rect != RT_NULL);
jpeg = (struct rtgui_image_jpeg*) image->data;
RT_ASSERT(jpeg != RT_NULL);
if (jpeg->pixels != RT_NULL)
{
ptr = (rtgui_color_t*) jpeg->pixels;
/* draw each point within dc */
for (y = 0; y < image->h; y ++)
{
for (x = 0; x < image->w; x++)
{
/* not alpha */
if ((*ptr >> 24) != 255)
{
rtgui_dc_draw_color_point(dc, x + rect->x1, y + rect->y1, *ptr);
}
/* move to next color buffer */
ptr ++;
}
}
}
else
{
/* seek to the begin of file */
rtgui_filerw_seek(jpeg->filerw, 0, SEEK_SET);
/* decompress line and line */
for (y = 0; y < image->h; y ++)
{
ptr = (rtgui_color_t*)rtgui_image_get_line(image, y);
for (x = 0; x < image->w; x++)
{
/* not alpha */
if ((*ptr >> 24) != 255)
{
rtgui_dc_draw_color_point(dc, x + rect->x1, y + rect->y1, *ptr);
}
/* move to next color buffer */
ptr ++;
}
}
}
}
static rt_bool_t rtgui_image_jpeg_check(struct rtgui_filerw* file)
{
int start;
rt_bool_t is_JPG;
int in_scan;
rt_uint8_t magic[4];
if (file == RT_NULL) return RT_FALSE; /* open file failed */
start = rtgui_filerw_tell(file);
is_JPG = RT_FALSE;
in_scan = 0;
/* seek to the begining of file */
rtgui_filerw_seek(file, 0, SEEK_SET);
if ( rtgui_filerw_read(file, magic, 2, 1) ) {
if ( (magic[0] == 0xFF) && (magic[1] == 0xD8) ) {
is_JPG = RT_TRUE;
while (is_JPG == RT_TRUE) {
if(rtgui_filerw_read(file, magic, 1, 2) != 2) {
is_JPG = RT_FALSE;
} else if( (magic[0] != 0xFF) && (in_scan == 0) ) {
is_JPG = RT_FALSE;
} else if( (magic[0] != 0xFF) || (magic[1] == 0xFF) ) {
/* Extra padding in JPEG (legal) */
/* or this is data and we are scanning */
rtgui_filerw_seek(file, -1, SEEK_CUR);
} else if(magic[1] == 0xD9) {
/* Got to end of good JPEG */
break;
} else if( (in_scan == 1) && (magic[1] == 0x00) ) {
/* This is an encoded 0xFF within the data */
} else if( (magic[1] >= 0xD0) && (magic[1] < 0xD9) ) {
/* These have nothing else */
} else if(rtgui_filerw_read(file, magic+2, 1, 2) != 2) {
is_JPG = RT_FALSE;
} else {
/* Yes, it's big-endian */
rt_uint32_t start;
rt_uint32_t size;
rt_uint32_t end;
start = rtgui_filerw_tell(file);
size = (magic[2] << 8) + magic[3];
end = rtgui_filerw_seek(file, size-2, SEEK_CUR);
if ( end != start + size - 2 ) is_JPG = RT_FALSE;
if ( magic[1] == 0xDA ) {
/* Now comes the actual JPEG meat */
/* It is a JPEG. */
break;
}
}
}
}
}
rtgui_filerw_seek(file, start, SEEK_SET);
return is_JPG;
}