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img.c
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img.c
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/* img.c
* Generic image decoding and PNG and JPG decoders.
* (c) 2002 Karel 'Clock' Kulhavy
* This is a part of the Links program, released under GPL.
* Used in graphics mode of Links only
TODO: odstranit zbytecne ditherovani z strip_optimized header_dimensions_known,
protoze pozadi obrazku musi byt stejne jako pozadi stranky, a to se nikdy
neditheruje, protoze je to vzdy jednolita barva. Kdyz uz to nepujde
odstranit tak tam aspon dat fixne zaokrouhlovani.
TODO: dodelat stripy do jpegu a png a tiff.
*/
#include "links.h"
#ifdef G
#define RESTART_SIZE 8192
/* Size of biggest chunk of compressed data that is processed in one run */
static struct g_object_image *global_goi;
struct cached_image *global_cimg;
int end_callback_hit;
static int is_image_size_sane(ssize_t x, ssize_t y)
{
size_t a;
if (x < 0 || y < 0) return 0;
if (x >= MAXINT || y >= MAXINT) return 0;
a = (size_t)x * (size_t)y * (drv->depth & 7);
if (y && (size_t)a / (size_t)y / (drv->depth & 7) != (size_t)x) return 0;
return a <= MAX_SIZE_T / 2;
}
/* mem_free(cimg->decoder) */
static void destroy_decoder (struct cached_image *cimg)
{
if (cimg->decoder){
switch(cimg->image_type){
case IM_PNG:
png_destroy_decoder(cimg);
break;
#ifdef HAVE_JPEG
case IM_JPG:
jpeg_destroy_decoder(cimg);
break;
#endif /* #ifdef HAVE_JPEG */
case IM_GIF:
gif_destroy_decoder(cimg);
break;
case IM_XBM:
/* do nothing */
break;
#ifdef HAVE_TIFF
case IM_TIFF:
tiff_destroy_decoder(cimg);
break;
#endif
#ifdef HAVE_SVG
case IM_SVG:
svg_destroy_decoder(cimg);
break;
#endif
}
mem_free(cimg->decoder);
}
}
static void mem_free_buffer(struct cached_image *cimg)
{
mem_free(cimg->buffer);
}
static void img_destruct_image(struct g_object *object)
{
struct g_object_image *goi = get_struct(object, struct g_object_image, goti.go);
if (goi->orig_src) mem_free(goi->orig_src);
if (goi->alt) mem_free(goi->alt);
if (goi->name) mem_free(goi->name);
if (goi->src) mem_free(goi->src);
release_image_map(goi->goti.map);
if (goi->list_entry.next) del_from_list(goi);
if (goi->goti.go.xw && goi->goti.go.yw) {
/* At least one dimension is zero */
deref_cached_image(goi->cimg);
}
mem_free(goi);
}
/* Frees all data allocated by cached_image including cached image itself */
void img_destruct_cached_image(struct cached_image *cimg)
{
switch (cimg->state){
case 0:
case 1:
case 2:
case 3:
case 9:
case 11:
break;
case 12:
case 14:
if (cimg->gamma_table) mem_free(cimg->gamma_table);
if (cimg->bmp_used){
drv->unregister_bitmap(&(cimg->bmp));
}
if (cimg->strip_optimized){
if (cimg->dregs) mem_free(cimg->dregs);
}else{
mem_free_buffer(cimg);
}
/*-fallthrough*/
case 8:
case 10:
destroy_decoder(cimg);
break;
case 13:
case 15:
drv->unregister_bitmap(&(cimg->bmp));
break;
#ifdef DEBUG
default:
fprintf(stderr, "img_destruct_cached_image: state=%d\n", cimg->state);
internal_error("Invalid state in struct cached_image");
#endif /* #ifdef DEBUG */
}
mem_free(cimg->url);
mem_free(cimg);
}
/* You throw in a vertical dimension of image and it returns
* new dimension according to the aspect ratio and user-set image
* scaling factor. When scaling factor is 100% and screen pixels
* are non-square, the picture will be always in one dimension
* untouched and in the second _ENLARGED_. So that no information
* in the picture will be lost.
* Input may be <0. In this case output=input
* Input may be 0. In this case output=0.
* If input is >0 the output is also >0.
*/
static ssize_t img_scale_h(unsigned scale, ssize_t in)
{
ssize_t out;
/* We assume unsigned long holds at least 32 bits */
unsigned long pre;
if (in<=0) return in;
pre=((unsigned long)(aspect<65536UL?65536UL:aspect)*scale+128)>>8;
out=(size_t)(((unsigned long)in*pre+12800UL)/25600UL);
if (out<1) out=1;
return out;
}
static ssize_t img_scale_v(unsigned scale, ssize_t in)
{
ssize_t out;
unsigned long divisor;
if (in<=0) return in;
divisor=(100*(aspect>=65536UL?65536UL:aspect)+128)>>8;
out=(ssize_t)(((unsigned long)in*(scale*256)+(divisor>>1))/divisor);
if (out<1) out=1;
return out;
}
/* Returns height (pixels) for prescribed width (pixels). Honours aspect. */
static ssize_t width2height(double width_px, double width_mm, double height_mm)
{
ssize_t height_px;
if (width_px<=0) return 0;
height_px=(ssize_t)((height_mm*width_px*65536)/(aspect*width_mm));
if (height_px<1) height_px=1;
return height_px;
}
/* Returns width (pixels) for prescribed height (pixels). Honours aspect. */
static ssize_t height2width(double height_px, double width_mm, double height_mm)
{
ssize_t width_px;
if (height_px<=0) return 0;
width_px=(ssize_t)((width_mm*height_px*aspect)/(65536*height_mm));
if (width_px<1) width_px=1;
return width_px;
}
/* Compute 8-bit background for filling buffer with cimg->*_gamma
* (performs rounding) */
void compute_background_8(struct cached_image *cimg, unsigned char rgb[3])
{
unsigned short red, green, blue;
round_color_sRGB_to_48(&red, &green, &blue, cimg->background_color);
rgb[0] = ags_16_to_8(red, (float)(cimg->red_gamma/(float)(user_gamma tcc_hack)));
rgb[1] = ags_16_to_8(green, (float)(cimg->green_gamma/(float)(user_gamma tcc_hack)));
rgb[2] = ags_16_to_8(blue, (float)(cimg->blue_gamma/(float)(user_gamma tcc_hack)));
}
/* updates cimg state when header dimensions are know. Only allowed to be called
* in state 8 and 10.
* Allocates right amount of memory into buffer, formats it (with background or
* zeroes, depens on buffer_bytes_per_pixel). Updates dimensions (xww and yww)
* according to newly known header dimensions. Fills in gamma_stamp, bmp_used
* (zero because we not bother with generating bitmap here)
* and rows_added.
* Resets strip_optimized if image will be scaled or
* Allocates dregs if on exit strip_optimized is nonzero.
* Allocates and computes gamma_table, otherwise
* sets gamma_table to NULL. Also doesn't make gamma table if image contains less
* than 1024 pixels (it would be probably a waste of time).
* Output state is always 12 (from input state 8) or 14 (from input state 10).
*
* The caller must have set the following elements of cimg:
* width
* height
* buffer_bytes_per_pixel
* red_gamma
* green_gamma
* blue_gamma
* strip_optimized
*/
int header_dimensions_known(struct cached_image *cimg)
{
unsigned short red, green, blue;
#ifdef DEBUG
if ((cimg->state^8)&13){
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("Invalid state in header_dimensions_known");
}
#endif /* #ifdef DEBUG */
if (cimg->width<1||cimg->height<1){
/*fprintf(stderr,"width=%d height=%d\n",cimg->width, cimg->height);*/
return 1;
}
if (!is_image_size_sane(cimg->width, cimg->height)) {
return 1;
}
if (cimg->wanted_xw<0){
/* Unspecified width */
if (cimg->wanted_yw<0){
/* Unspecified neither width nor height */
cimg->xww=img_scale_h(cimg->scale, cimg->width);
cimg->yww=img_scale_v(cimg->scale, cimg->height);
}else{
/* Unspecified width specified height */
cimg->xww=height2width(cimg->yww,
cimg->width, cimg->height);
if (cimg->xww<=0) cimg->xww=1;
}
}else{
/* Specified width */
if (cimg->wanted_yw<0){
/* Unspecified height, specified width */
cimg->yww=width2height(cimg->xww,
cimg->width, cimg->height);
if (cimg->yww<=0) cimg->yww=1;
}else if (cimg->wanted_xyw_meaning==MEANING_AUTOSCALE){
/* Specified height and width and autoscale meant */
/* Try first to nail the height */
cimg->yww=cimg->wanted_yw;
cimg->xww=height2width(cimg->yww,
cimg->width, cimg->height);
if (cimg->xww>cimg->wanted_xw)
{
/* Width too much, we nail the width */
cimg->xww=cimg->wanted_xw;
cimg->yww=width2height(cimg->xww,
cimg->width, cimg->height);
}
/* Some sanity checks */
if (cimg->xww<=0) cimg->xww=1;
if (cimg->yww<=0) cimg->yww=1;
}
}
if (!is_image_size_sane(cimg->xww, cimg->yww)) {
cimg->xww = cimg->width;
cimg->yww = cimg->height;
}
#ifdef HAVE_SVG
if (cimg->image_type == IM_SVG) {
/* SVG images are scaled using the cairo library, not the Links scaler */
cimg->width = cimg->xww;
cimg->height = cimg->yww;
}
#endif
if (cimg->width!=cimg->xww||cimg->height!=cimg->yww) cimg->strip_optimized=0;
cimg->gamma_stamp=gamma_stamp;
if (cimg->strip_optimized){
struct bitmap tmpbmp;
unsigned short *buf_16;
ssize_t i;
tmpbmp.x = (int)cimg->width;
tmpbmp.y = 1;
/* No buffer, bitmap is valid from the very beginning */
cimg->bmp.x = (int)cimg->width;
cimg->bmp.y = (int)cimg->height;
if (drv->get_empty_bitmap(&(cimg->bmp))) {
cimg->dregs = NULL;
goto skip_img;
}
if ((size_t)cimg->width > MAX_SIZE_T / sizeof(*buf_16) / 3) overalloc();
buf_16 = mem_alloc(sizeof(*buf_16) * 3 * (size_t)cimg->width);
round_color_sRGB_to_48(&red, &green, &blue
, cimg->background_color);
mix_one_color_48(buf_16,cimg->width, red, green, blue);
#ifdef DEBUG
if (cimg->height<=0){
fprintf(stderr,"cimg->height=%ld\n", (long)cimg->height);
internal_error("Invalid cimg->height in strip_optimized section of header_dimensions_known");
}
#endif /* #ifdef DEBUG */
/* The skip is uninitialized here and is read by dither_start
* but is not used in any malicious way so it doesn't matter
*/
tmpbmp.data = cimg->bmp.data;
tmpbmp.skip = cimg->bmp.skip;
cimg->dregs=dither_images?dither_start(buf_16,&tmpbmp):NULL;
tmpbmp.data=(unsigned char *)tmpbmp.data+cimg->bmp.skip;
if (cimg->dregs)
for (i=cimg->height-1;i;i--){
dither_restart(buf_16,&tmpbmp,cimg->dregs);
tmpbmp.data=(unsigned char *)tmpbmp.data+cimg->bmp.skip;
}
else
for (i=cimg->height-1;i;i--){
(*round_fn)(buf_16,&tmpbmp);
tmpbmp.data=(unsigned char *)tmpbmp.data+cimg->bmp.skip;
}
mem_free(buf_16);
skip_img:
drv->register_bitmap(&(cimg->bmp));
if(cimg->dregs) memset(cimg->dregs,0,cimg->width*sizeof(*cimg->dregs)*3);
cimg->bmp_used=1; /* Nonzero value */
/* This ensures the dregs are none and because strip
* optimization is unusable in interlaced pictures,
* this saves the zeroing out at the beginning of the
* decoder itself.
*/
}else {
cimg->rows_added=1;
cimg->bmp_used=0;
if (cimg->width && (size_t)cimg->width * (size_t)cimg->height / (size_t)cimg->width != (size_t)cimg->height) overalloc();
cimg->buffer = mem_alloc_mayfail((size_t)cimg->width * (size_t)cimg->height * (size_t)cimg->buffer_bytes_per_pixel);
if (!cimg->buffer)
return 1;
if (cimg->buffer_bytes_per_pixel==4
||cimg->buffer_bytes_per_pixel==4
*sizeof(unsigned short))
{
/* Make the buffer contain full transparency */
memset(cimg->buffer, 0, (size_t)cimg->width * (size_t)cimg->height * (size_t)cimg->buffer_bytes_per_pixel);
}else{
/* Fill the buffer with background color */
if (cimg->buffer_bytes_per_pixel > 4){
/* 16-bit */
unsigned short red, green, blue;
round_color_sRGB_to_48(&red, &green, &blue, cimg->background_color);
red=ags_16_to_16(red, (float)(cimg->red_gamma / (float)(user_gamma tcc_hack)));
green=ags_16_to_16(green, (float)(cimg->green_gamma / (float)(user_gamma tcc_hack)));
blue=ags_16_to_16(blue, (float)(cimg->blue_gamma / (float)(user_gamma tcc_hack)));
mix_one_color_48((unsigned short *)cimg->buffer, cimg->width*cimg->height, red, green, blue);
} else {
unsigned char rgb[3];
/* 8-bit */
compute_background_8(cimg, rgb);
mix_one_color_24(cimg->buffer, cimg->width * cimg->height, rgb[0], rgb[1], rgb[2]);
}
}
}
if (cimg->buffer_bytes_per_pixel<=4&&cimg->width*cimg->height>=1024){
make_gamma_table(cimg);
}else if (cimg->buffer_bytes_per_pixel>=6&&cimg->width*cimg->height>=262144){
make_gamma_table(cimg);
}else cimg->gamma_table=NULL;
cimg->state|=4; /* Update state */
return 0;
}
/* Fills "tmp" buffer with the resulting data and does not free the input
* buffer. May be called only in states 12 and 14 of cimg
*/
static unsigned short *buffer_to_16(unsigned short *tmp, struct cached_image *cimg, unsigned char *buffer, ssize_t height)
{
unsigned short red, green, blue;
#ifdef DEBUG
if (cimg->state != 12 && cimg->state != 14){
fprintf(stderr, "cimg->state=%d\n", cimg->state);
internal_error("invalid state in buffer_to_16");
}
#endif /* #ifdef DEBUG */
switch (cimg->buffer_bytes_per_pixel) {
case 3:
if (cimg->gamma_table) {
agx_24_to_48_table(tmp, buffer, cimg->width*height, cimg->gamma_table);
} else {
agx_24_to_48(tmp, buffer, cimg->width * height,
(float)((float)(user_gamma tcc_hack) / cimg->red_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->green_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->blue_gamma));
}
break;
case 3 * sizeof(unsigned short):
if (cimg->gamma_table) {
agx_48_to_48_table(tmp, (unsigned short *)buffer, cimg->width * height, cimg->gamma_table);
} else {
agx_48_to_48(tmp, (unsigned short *)buffer, cimg->width * height,
(float)((float)(user_gamma tcc_hack) / cimg->red_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->green_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->blue_gamma));
}
break;
/* Alpha's: */
case 4:
round_color_sRGB_to_48(&red,&green,&blue,cimg->background_color);
if (cimg->gamma_table) {
agx_and_uc_32_to_48_table(tmp, buffer, cimg->width * height, cimg->gamma_table, red, green, blue);
} else {
agx_and_uc_32_to_48(tmp,buffer, cimg->width*height,
(float)((float)(user_gamma tcc_hack) / cimg->red_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->green_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->blue_gamma),
red, green, blue);
}
break;
case 4 * sizeof(unsigned short):
round_color_sRGB_to_48(&red, &green, &blue, cimg->background_color);
if (cimg->gamma_table) {
agx_and_uc_64_to_48_table(tmp, (unsigned short *)buffer, cimg->width * height, cimg->gamma_table, red, green, blue);
} else {
agx_and_uc_64_to_48(tmp, (unsigned short *)buffer, cimg->width * height,
(float)((float)(user_gamma tcc_hack) / cimg->red_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->green_gamma),
(float)((float)(user_gamma tcc_hack) / cimg->blue_gamma),
red,green,blue);
}
break;
#ifdef DEBUG
default:
internal_error("buffer_to_16: unknown mem organization");
#endif /* #ifdef DEBUG */
}
return tmp;
}
/* Returns allocated buffer with the resulting data and does not free the input
* buffer. May be called only in states 12 and 14 of cimg
* use_strip: 1 if the image is already registered and prepare_strip and
* commit_strip is to be used
* 0: if the image is not yet registered and instead one big register_bitmap
* will be used eventually
* dregs must be externally allocated and contain required value or must be
* NULL.
* if !dregs then rounding is performed instead of dithering.
* dregs are not freed.
* bottom dregs are placed back into dregs.
* Before return the bitmap will be in registered state and changes will be
* commited.
* height must be >=1 !!!
*/
void buffer_to_bitmap_incremental(struct cached_image *cimg,
unsigned char *buffer, ssize_t height, ssize_t yoff, int *dregs, int use_strip)
{
#define max_height 16
/* max_height must be at least 1 */
unsigned short *tmp;
struct bitmap tmpbmp;
ssize_t add1 = 0, add2;
#ifdef DEBUG
if (cimg->state!=12&&cimg->state!=14){
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("Invalid state in buffer_to_bitmap_incremental\n");
}
if (height<1){
fprintf(stderr,"height=%ld\n", (long)height);
internal_error("Invalid height in buffer_to_bitmap_incremental\n");
}
if (cimg->width<1||cimg->height<1){
fprintf(stderr,"cimg->width=%ld, cimg->height=%ld\n", (long)cimg->width, (long)cimg->height);
internal_error("Invalid cimg->width x cimg->height in\
buffer_to_bitmap_incremental");
}
#endif /* #ifdef DEBUG */
if ((size_t)cimg->width > MAX_SIZE_T / (size_t)max_height / 3 / sizeof(*tmp)) overalloc();
tmp=mem_alloc((size_t)cimg->width * (size_t)(height < max_height ? height : max_height) * 3 * sizeof(*tmp));
/* Prepare a fake bitmap for dithering */
tmpbmp.x = (int)cimg->width;
if (!use_strip){
tmpbmp.data=(unsigned char *)cimg->bmp.data+cimg->bmp.skip*yoff;
add1=cimg->bmp.skip*max_height;
}
add2=cimg->buffer_bytes_per_pixel*cimg->width*max_height;
not_enough:
tmpbmp.y = (int)(height < max_height ? height : max_height);
if (use_strip) {
tmpbmp.data = drv->prepare_strip(&(cimg->bmp), (int)yoff, tmpbmp.y);
if (!tmpbmp.data) goto prepare_failed;
}
tmpbmp.skip=cimg->bmp.skip;
buffer_to_16(tmp, cimg, buffer, tmpbmp.y);
if (dregs) {
dither_restart(tmp, &tmpbmp, dregs);
} else {
(*round_fn)(tmp, &tmpbmp);
}
if (use_strip) {
prepare_failed:
drv->commit_strip(&(cimg->bmp), (int)yoff, tmpbmp.y);
}
height-=tmpbmp.y;
if (!height) goto end;
buffer+=add2;
yoff+=tmpbmp.y;
tmpbmp.data=(unsigned char *)tmpbmp.data+add1;
/* This has no effect if use_strip but it's faster
* to add to bogus value than to play with
* conditional jumps.
*/
goto not_enough;
end:
mem_free(tmp);
if (!use_strip) drv->register_bitmap(&(cimg->bmp));
}
/* Takes the buffer and resamples the data into the bitmap. Automatically
* destroys the previous bitmap. Must be called only when cimg->buffer is valid.
* Sets bmp_used to non-zero.
* If gamma_table is used, it must be still allocated here (take care if you
* want to destroy gamma table and call buffer_to_bitmap, first call buffer_to_bitmap
* and then destroy gamma_table).
*/
static void buffer_to_bitmap(struct cached_image *cimg)
{
unsigned short *tmp, *tmp1;
ssize_t ix, iy, ox, oy;
int gonna_be_smart;
int *dregs;
#ifdef DEBUG
if(cimg->state!=12&&cimg->state!=14){
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("buffer_to_bitmap called in invalid state");
}
if (cimg->strip_optimized) internal_error("strip_optimized in buffer_to_bitmap");
if (cimg->width<1||cimg->height<1){
fprintf(stderr,"cimg->width=%ld, cimg->height=%ld\n", (long)cimg->width, (long)cimg->height);
internal_error("Invalid cimg->width x cimg->height in buffer_to_bitmap");
}
#endif /* #ifdef DEBUG */
if (!cimg->rows_added) return;
/* Here of course width and height must be already filled */
cimg->rows_added=0;
ix=cimg->width;
iy=cimg->height;
ox=cimg->xww;
oy=cimg->yww;
if (ix==ox&&iy==oy) gonna_be_smart=1;
else{
gonna_be_smart=0;
if (ix && (size_t)ix * (size_t)iy / (size_t)ix != (size_t)iy) overalloc();
if ((size_t)ix * (size_t)iy > MAX_SIZE_T / sizeof(*tmp) / 3) overalloc();
tmp = mem_alloc_mayfail((size_t)ix * (size_t)iy * 3 * sizeof(*tmp));
if (tmp) buffer_to_16(tmp, cimg, cimg->buffer, iy);
if (!cimg->decoder){
mem_free_buffer(cimg);
cimg->buffer=NULL;
}
/* Scale the image to said size */
#ifdef DEBUG
if (ox<=0||oy<=0){
internal_error("ox or oy <=0 before resampling image");
}
#endif /* #ifdef DEBUG */
if (tmp && (ix!=ox || iy!=oy)) {
/* We must really scale */
tmp1=tmp;
scale_color(tmp1,ix,iy,&tmp,ox,oy);
}
}
if (cimg->bmp_used) drv->unregister_bitmap(&cimg->bmp);
cimg->bmp.x = (int)ox;
cimg->bmp.y = (int)oy;
if (drv->get_empty_bitmap(&(cimg->bmp))) {
if (!gonna_be_smart) {
if (tmp) {
mem_free(tmp);
}
}
goto bitmap_failed;
}
if (gonna_be_smart){
if (dither_images) {
if ((size_t)cimg->width > MAX_SIZE_T / 3 / sizeof(*dregs)) overalloc();
dregs = mem_calloc(sizeof(*dregs) * 3 * (size_t)cimg->width);
} else {
dregs = NULL;
}
buffer_to_bitmap_incremental(cimg, cimg->buffer, cimg->height,
0, dregs, 0);
if (dregs) mem_free(dregs);
}else{
if (tmp) {
if (dither_images)
dither(tmp, &cimg->bmp);
else
(*round_fn)(tmp, &cimg->bmp);
mem_free(tmp);
} else {
int i;
unsigned char *ptr = cimg->bmp.data;
for (i = 0; i < cimg->bmp.y; i++) {
memset(ptr, 0, cimg->bmp.x * (drv->depth & 7));
ptr += cimg->bmp.skip;
}
}
bitmap_failed:
drv->register_bitmap(&(cimg->bmp));
}
cimg->bmp_used=1;
/* Indicate that the bitmap is valid. The value is just any
nonzero value */
cimg->rows_added=0;
/* Indicate the bitmap is up-to-date */
}
/* Performs state transition for end of stream or error in image or
* end of image */
void img_end(struct cached_image *cimg)
{
switch(cimg->state){
case 12:
case 14:
if (cimg->strip_optimized){
if (cimg->dregs) mem_free(cimg->dregs);
}
else{
buffer_to_bitmap(cimg);
mem_free_buffer(cimg);
}
if (cimg->gamma_table) mem_free(cimg->gamma_table);
/*-fallthrough*/
case 8:
case 10:
destroy_decoder(cimg);
case 0:
case 1:
case 2:
case 3:
case 9:
case 11:
case 13:
case 15:
break;
#ifdef DEBUG
default:
fprintf(stderr,"state=%d\n",cimg->state);
internal_error("Invalid state encountered in end");
#endif /* #ifdef DEBUG */
}
cimg->state|=1;
}
static void r3l0ad(struct cached_image *cimg, struct g_object_image *goi)
{
cimg->eof_hit=0;
cimg->last_count=goi->af->rq->ce->count;
cimg->last_count2=goi->af->rq->ce->count2;
cimg->gamma_stamp=gamma_stamp;
switch(cimg->state){
case 8:
case 10:
destroy_decoder(cimg);
case 1:
case 3:
case 9:
case 11:
case 0:
case 2:
break;
case 12:
if (cimg->gamma_table) mem_free(cimg->gamma_table);
destroy_decoder(cimg);
if (cimg->strip_optimized){
if (cimg->dregs) mem_free(cimg->dregs);
}else{
mem_free_buffer(cimg);
}
if (cimg->bmp_used){
case 13:
drv->unregister_bitmap(&cimg->bmp);
}
cimg->xww=img_scale_h(cimg->scale, cimg->wanted_xw<0?32:cimg->wanted_xw);
cimg->yww=img_scale_v(cimg->scale, cimg->wanted_yw<0?32:cimg->wanted_yw);
break;
case 14:
if (cimg->gamma_table) mem_free(cimg->gamma_table);
destroy_decoder(cimg);
if (cimg->strip_optimized){
if (cimg->dregs) mem_free(cimg->dregs);
}else{
mem_free_buffer(cimg);
}
if (cimg->bmp_used){
case 15:
drv->unregister_bitmap(&cimg->bmp);
}
break;
#ifdef DEBUG
default:
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("Invalid state in r3l0ad()");
#endif /* #ifdef DEBUG */
}
cimg->state&=2;
}
/* Returns 1 if match.
* If doesn't return 1 then returns 0
*/
static inline int dtest(unsigned char *templat, unsigned char *test)
{
return !casestrcmp(templat, test);
}
/* This may be called only in state 0 or 2 */
static void type(struct cached_image *cimg, unsigned char *content_type, unsigned char *data /* at least 4 bytes */)
{
#ifdef DEBUG
if (cimg->state!=0&&cimg->state!=2){
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("Invalid state encountered in type()");
}
#endif /* #ifdef DEBUG */
#ifdef HAVE_JPEG
if (data[0] == 0xff && data[1] == 0xd8)
goto have_jpeg;
#endif
#ifdef HAVE_TIFF
if (data[0] == 'I' && data[1] == 'I')
goto have_tiff;
if (data[0] == 'M' && data[1] == 'M')
goto have_tiff;
#endif
#ifdef HAVE_SVG
if (data[0] == '<' && data[1] == '?')
goto have_svg;
#endif
if (data[0] == 0x89 && data[1] == 'P' && data[2] == 'N' && data[3] == 'G')
goto have_png;
if (data[0] == 'G' && data[1] == 'I' && data[2] == 'F')
goto have_gif;
#ifdef HAVE_JPEG
if (dtest(cast_uchar "image/jpeg",content_type) ||
dtest(cast_uchar "image/jpg",content_type) ||
dtest(cast_uchar "image/jpe",content_type) ||
dtest(cast_uchar "image/pjpe",content_type) ||
dtest(cast_uchar "image/pjpeg",content_type) ||
dtest(cast_uchar "image/pjpg",content_type)) {
have_jpeg:
cimg->image_type=IM_JPG;
jpeg_start(cimg);
} else
#endif /* #ifdef HAVE_JPEG */
if (dtest(cast_uchar "image/png",content_type) ||
dtest(cast_uchar "image/x-png",content_type)) {
have_png:
cimg->image_type=IM_PNG;
png_start(cimg);
} else if (dtest(cast_uchar "image/gif",content_type)){
have_gif:
cimg->image_type=IM_GIF;
gif_start(cimg);
} else if (dtest(cast_uchar "image/x-xbitmap",content_type)){
cimg->image_type=IM_XBM;
xbm_start(cimg);
} else
#ifdef HAVE_TIFF
if (dtest(cast_uchar "image/tiff",content_type) ||
dtest(cast_uchar "image/tif",content_type)) {
have_tiff:
cimg->image_type=IM_TIFF;
tiff_start(cimg);
} else
#endif /* #ifdef HAVE_TIFF */
#ifdef HAVE_SVG
if (dtest(cast_uchar "image/svg+xml",content_type) ||
dtest(cast_uchar "image/svg",content_type)) {
have_svg:
cimg->image_type=IM_SVG;
svg_start(cimg);
} else
#endif /* #ifdef HAVE_SVG */
{
/* Error */
img_end(cimg);
return;
}
cimg->state|=8; /* Advance the state according to the table in
links-doc.html */
cimg->last_length=0;
}
/* Doesn't print anything. Downloads more data if available.
* Sets up cimg->reparse and cimg->xww and cimg->yww accordingly to
* the state of the decoder. When changing xww and yww also changes xw and yw
* in g_object_image.
* return value 1 means the data were chopped and the caller shall not redraw
* (because it would be too slow and because we are probably choked
* up with the data)
*/
static int img_process_download(struct g_object_image *goi, struct f_data_c *fdatac)
{
unsigned char *data, *ctype;
size_t total_len;
struct cached_image *cimg = goi->cimg;
int chopped=0;
#ifdef DEBUG
if (!goi->af) internal_error("NULL goi->af in process_download\n");
if (cimg->state>=16){ /* Negative don't occur because it's unsigned char */
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal_error("Invalid cimg->state in img_process_download\n");
}
#endif /* #ifdef DEBUG */
if (!goi->af->rq) return 0;
if (get_file(goi->af->rq, &data, &total_len)) goto end;
if (total_len < 4) goto end;
if (total_len > MAXINT) total_len = MAXINT;
/*fprintf(stderr, "processing: %s\n", goi->af->rq->ce->url);*/
if (goi->af->rq->ce->count2!=cimg->last_count2||
(goi->af->rq->ce->count!=cimg->last_count && cimg->eof_hit) ||
(cimg->state>=12&&gamma_stamp!=cimg->gamma_stamp)){
/* Reload */
r3l0ad(cimg,goi);
}
/*if (!goi->af->rq->ce->head) goto end;*/ /* Mikulas: head muze byt NULL*/ /* Mikulas: tak se to zpracuje a nebude se skakat na konec, kdyz je to NULL */
if (cimg->state==0||cimg->state==2){
/* Type still unknown */
ctype=get_content_type(goi->af->rq->ce->head,
goi->af->rq->url);
if (!ctype) ctype = stracpy(cast_uchar "application/octet-stream");
type(cimg,ctype,data);
mem_free(ctype);
}
/* Now, if we are in state where decoder is running (8, 10, 12, 14), we may feed
* some data into it.
*/
if (!((cimg->state^8)&9)){
int length = (int)total_len;
if (length<=cimg->last_length) goto end; /* No new data */
data+=cimg->last_length;
length-=cimg->last_length;
if (length>RESTART_SIZE){
length=RESTART_SIZE;
chopped=1;
if (fdatac) {
refresh_image(fdatac, &goi->goti.go, 0);
}
}
/* Decoder has been already started */
switch(cimg->image_type){
case IM_PNG:
png_restart(cimg,data,length);
break;
#ifdef HAVE_JPEG
case IM_JPG:
jpeg_restart(cimg,data,length);
break;
#endif /* #ifdef HAVE_JPEG */
case IM_XBM:
xbm_restart(cimg,data,length);
break;
case IM_GIF:
gif_restart(data,length);
break;
#ifdef HAVE_TIFF
case IM_TIFF:
tiff_restart(cimg,data,length);
break;
#endif /* #ifdef HAVE_TIFF */
#ifdef HAVE_SVG
case IM_SVG:
svg_restart(cimg,data,length);
break;
#endif /* #ifdef HAVE_SVG */
#ifdef DEBUG
default:
fprintf(stderr,"cimg->image_type=%d\n",cimg->state);
internal_error("Invalid image_type encountered when processing data in\
img_process_download.\n");
#endif /* #ifdef DEBUG */
}
cimg->last_length+=length;
}
end:
/* Test end */
if (!is_entry_used(goi->af->rq->ce) && (goi->af->rq->state < 0
||(goi->af->rq->ce&&goi->af->rq->stat.state<0))){
/* We must not perform end with chopped because some
* unprocessed data still wait for us :)
*/
if (!chopped){
if (!((cimg->state^8)&9)) {
#ifdef HAVE_TIFF
if (cimg->image_type==IM_TIFF)
tiff_finish(cimg);
#endif
#ifdef HAVE_SVG
if (cimg->image_type==IM_SVG)
svg_finish(cimg);
#endif
}
cimg->eof_hit=1;
if (goi->af->rq->ce)
cimg->last_count=goi->af->rq->ce->count;
img_end(cimg);
}
} else if (!chopped) {
if (fdatac) {
if (f_is_finished(fdatac->f_data)) {
refresh_image(fdatac, &goi->goti.go, 2000);
} else {
/*
* Fix a bug - if we have a text file with html and built-in image using
* the data:// url. If we press '\' to toggle the view from text to
* html, the image is not displayed correctly. We need to reset
* fdatac->done to force re-parse.
*/
fdatac->done = 0;
}
}
}
return chopped;
}
/* Input: rgb (sRGB) triplet (0...255)
* Returns a color that is very contrasty on that background sRGB color
*/
int get_foreground(int rgb)
{
int r,g,b;
r=(rgb>>16)&255;
g=(rgb>>8)&255;
b=rgb&255;
r=r<128?255:0;
g=g<128?255:0;
b=b<128?255:0;
return (r<<16)|(g<<8)|b;
}
static void draw_frame_mark(struct graphics_device *dev, int x, int y, int xw, int yw, long bg, long fg, int broken)
{
#ifdef DEBUG
if (xw<1||yw<1) internal_error("zero dimension in draw_frame_mark");
#endif /* #ifdef DEBUG */
if (broken == 1){
/* Draw between ( 0 and 1/4 ) and ( 3/4 and 1 ) of each
* side (0-1)
*/
int xl, xh, yl, yh;
xh=xw-(xl=xw>>2);
yh=yw-(yl=yw>>2);