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/*
* JPEG image handling functions
*/
#include "ctwm.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "screen.h"
#include "image.h"
#include "image_jpeg.h"
/* Bits needed for libjpeg and interaction */
#include <setjmp.h>
#include <jpeglib.h>
#include <jerror.h>
#include <X11/Xlib.h>
/* Various internal bits */
static Image *LoadJpegImage(const char *name);
static Image *LoadJpegImageCp(const char *name, ColorPair cp);
static void convert_for_16(int w, int x, int y, int r, int g, int b);
static void convert_for_32(int w, int x, int y, int r, int g, int b);
static void jpeg_error_exit(j_common_ptr cinfo);
struct jpeg_error {
struct jpeg_error_mgr pub;
sigjmp_buf setjmp_buffer;
};
typedef struct jpeg_error *jerr_ptr;
static uint16_t *buffer_16bpp;
static uint32_t *buffer_32bpp;
/*
* External entry point
*/
Image *
GetJpegImage(const char *name)
{
ColorPair dummy = {0};
/* Non-animated */
if(! strchr(name, '%')) {
return (LoadJpegImage(name));
}
/* Animated */
return get_image_anim_cp(name, dummy, LoadJpegImageCp);
}
/*
* Internal backend func
*/
/* Trivial thunk for get_image_anim_cp() callback */
static Image *
LoadJpegImageCp(const char *name, ColorPair cp)
{
return LoadJpegImage(name);
}
/* The actual loader */
static Image *
LoadJpegImage(const char *name)
{
char *fullname;
XImage *ximage;
FILE *infile;
Image *image;
Pixmap pixret;
void (*store_data)(int w, int x, int y, int r, int g, int b);
struct jpeg_decompress_struct cinfo;
struct jpeg_error jerr;
JSAMPARRAY buffer;
int width, height;
int row_stride;
int g, i, a;
int bpix;
GC gc;
fullname = ExpandPixmapPath(name);
if(! fullname) {
return NULL;
}
image = AllocImage();
if(image == NULL) {
free(fullname);
return NULL;
}
if((infile = fopen(fullname, "rb")) == NULL) {
if(reportfilenotfound) {
fprintf(stderr, "unable to locate %s\n", fullname);
}
fflush(stdout);
free(image);
free(fullname);
return NULL;
}
free(fullname);
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = jpeg_error_exit;
if(sigsetjmp(jerr.setjmp_buffer, 1)) {
jpeg_destroy_decompress(&cinfo);
free(image);
fclose(infile);
return NULL;
}
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, FALSE);
cinfo.do_fancy_upsampling = FALSE;
cinfo.do_block_smoothing = FALSE;
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
if(Scr->d_depth == 16) {
store_data = &convert_for_16;
buffer_16bpp = malloc((width) * (height) * 2);
ximage = XCreateImage(dpy, CopyFromParent, Scr->d_depth, ZPixmap, 0,
(char *) buffer_16bpp, width, height, 16, width * 2);
}
else if(Scr->d_depth == 24 || Scr->d_depth == 32) {
store_data = &convert_for_32;
buffer_32bpp = malloc(width * height * 4);
ximage = XCreateImage(dpy, CopyFromParent, Scr->d_depth, ZPixmap, 0,
(char *) buffer_32bpp, width, height, 32, width * 4);
}
else {
fprintf(stderr, "Image %s unsupported depth : %d\n", name, Scr->d_depth);
free(image);
fclose(infile);
return NULL;
}
if(ximage == NULL) {
fprintf(stderr, "cannot create image for %s\n", name);
free(image);
fclose(infile);
return NULL;
}
g = 0;
row_stride = cinfo.output_width * cinfo.output_components;
buffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr) & cinfo, JPOOL_IMAGE, row_stride, 1);
bpix = cinfo.output_components;
while(cinfo.output_scanline < cinfo.output_height) {
jpeg_read_scanlines(&cinfo, buffer, 1);
a = 0;
for(i = 0; i < bpix * cinfo.output_width; i += bpix) {
(*store_data)(width, a, g, buffer[0][i], buffer[0][i + 1], buffer[0][i + 2]);
a++;
}
g++;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
gc = DefaultGC(dpy, Scr->screen);
if((width > (Scr->rootw / 2)) || (height > (Scr->rooth / 2))) {
int x, y;
pixret = XCreatePixmap(dpy, Scr->Root, Scr->rootw, Scr->rooth, Scr->d_depth);
x = (Scr->rootw - width) / 2;
y = (Scr->rooth - height) / 2;
XFillRectangle(dpy, pixret, gc, 0, 0, Scr->rootw, Scr->rooth);
XPutImage(dpy, pixret, gc, ximage, 0, 0, x, y, width, height);
image->width = Scr->rootw;
image->height = Scr->rooth;
}
else {
pixret = XCreatePixmap(dpy, Scr->Root, width, height, Scr->d_depth);
XPutImage(dpy, pixret, gc, ximage, 0, 0, 0, 0, width, height);
image->width = width;
image->height = height;
}
if(ximage) {
XDestroyImage(ximage);
}
image->pixmap = pixret;
return image;
}
/*
* Utils
*/
static void
convert_for_16(int w, int x, int y, int r, int g, int b)
{
buffer_16bpp [y * w + x] = ((r >> 3) << 11) + ((g >> 2) << 5) + (b >> 3);
}
static void
convert_for_32(int w, int x, int y, int r, int g, int b)
{
buffer_32bpp [y * w + x] = ((r << 16) + (g << 8) + b) & 0xFFFFFFFF;
}
static void
jpeg_error_exit(j_common_ptr cinfo)
{
jerr_ptr errmgr = (jerr_ptr) cinfo->err;
cinfo->err->output_message(cinfo);
siglongjmp(errmgr->setjmp_buffer, 1);
return;
}
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