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