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stb-imv/imv.c
nothings.org a553caff7f open file dialog (no argument, or ctrl-O)
2007-06-25 22:24:56 +00:00

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/* stb(imv) windows image viewer
Copyright 2007 Sean Barrett
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// Set section alignment to be nice and small
#pragma comment(linker, "/FILEALIGN:0x200")
//#pragma comment(linker, "/OPT:NOWIN98")
#define WIN32_MEAN_AND_LEAN
#define WIN32_EXTRA_LEAN
#define _WIN32_WINNT 0x0400
#include <windows.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <assert.h>
#define STB_DEFINE
#include "stb.h" /* http://nothings.org/stb.h */
#include "stb_image.c" /* http://nothings.org/stb_image.c */
void error(char *str) { MessageBox(NULL, str, "imv(stb) error", MB_OK); }
int do_debug;
void o(char *str, ...)
{
if (do_debug) {
char buffer[1024];
va_list va;
va_start(va,str);
vsprintf(buffer, str, va);
va_end(va);
OutputDebugString(buffer);
}
}
#define FRAME 3
#define FRAME2 (FRAME >> 1)
#define GREY 192
enum
{
WM_APP_DECODED = WM_APP,
};
#if WINVER < 0x0500
#define SM_XVIRTUALSCREEN 76
#define SM_YVIRTUALSCREEN 77
#define SM_CXVIRTUALSCREEN 78
#define SM_CYVIRTUALSCREEN 79
#define SM_CMONITORS 80
#define SM_SAMEDISPLAYFORMAT 81
#endif
CHAR szAppName[]="stb_imv";
HDC hDC;
HWND win;
HGLRC hRC;
HINSTANCE hInst;
char *displayName = "imv(stb)";
#define BPP 4
void platformDrawBitmap(HDC hdc, int x, int y, unsigned char *bits, int w, int h, int stride)
{
BITMAPINFOHEADER b;
int result;
memset(&b, 0, sizeof(b));
b.biSize = sizeof(b);
b.biPlanes=1;
b.biBitCount=BPP*8;
b.biWidth = stride/BPP;
b.biHeight = -h; // tell windows the bitmap is stored top-to-bottom
if (IsBadReadPtr(bits, w*h*BPP)) {
assert(0);
}
result = SetDIBitsToDevice(hdc, x,y, w,abs(h), 0,0, 0,abs(h), bits, (BITMAPINFO *) &b, DIB_RGB_COLORS);
if (result == 0) {
DWORD e = GetLastError();
}
}
void barrier(void)
{
long dummy;
__asm {
xchg dummy, eax
}
}
typedef struct
{
int x,y,stride,frame;
unsigned char *pixels;
} Image;
enum
{
// owned by main thread
LOAD_unused=0, // empty slot
LOAD_inactive, // filename slot, not loaded
// finished reading, needs decoding--originally decoder
// owned this, but then we couldn't free from the cache
LOAD_reading_done,
// in any of the following states, the image is as done as it can be
LOAD_error_reading,
LOAD_error_decoding,
LOAD_available, // loaded successfully
// owned by resizer
LOAD_resizing,
// owned by loader
LOAD_reading,
// owned by decoder
LOAD_decoding,
};
#define MAIN_OWNS(x) ((x)->status <= LOAD_available)
typedef struct
{
int priority;
char *filename;
char *filedata;
int len;
Image *image;
char *error;
int status;
int bail;
int lru;
} ImageFile;
stb_mutex cache_mutex, decode_mutex;
stb_semaphore decode_queue;
stb_semaphore disk_command_queue;
typedef struct
{
int num_files;
ImageFile *files[4];
} DiskCommand;
volatile DiskCommand dc_shared;
// awake the main thread when something interesting happens
void wake(int message)
{
PostMessage(win, message, 0,0);
}
volatile ImageFile *image_decode_pending;
void *diskload_task(void *p)
{
for(;;) {
int i;
DiskCommand dc;
// wait for a command from the main thread
o("READ: Waiting for disk request.\n");
stb_sem_waitfor(disk_command_queue);
// grab the command; don't let the command or the cache change while we do it
stb_mutex_begin(cache_mutex);
{
dc = dc_shared;
for (i=0; i < dc.num_files; ++i)
dc.files[i]->status = LOAD_reading;
}
stb_mutex_end(cache_mutex);
o("READ: Got disk request, %d items.\n", dc.num_files);
for (i=0; i < dc.num_files; ++i) {
int n;
uint8 *data;
assert(dc.files[i]->status == LOAD_reading);
// check if the main thread changed its mind about this
if (dc.files[i]->bail) {
o("READ: Bailing on disk request\n");
dc.files[i]->status = LOAD_inactive;
} else {
o("READ: Loading file %s\n", dc.files[i]->filename);
data = stb_file(dc.files[i]->filename, &n);
// don't need to mutex these, because we own them via ->status
if (data == NULL) {
dc.files[i]->error = strdup("can't open");
dc.files[i]->filedata = NULL;
dc.files[i]->len = 0;
barrier();
dc.files[i]->status = LOAD_error_reading;
} else {
dc.files[i]->error = NULL;
assert(dc.files[i]->filedata == NULL);
dc.files[i]->filedata = data;
dc.files[i]->len = n;
barrier();
dc.files[i]->status = LOAD_reading_done;
// now set the image decode command for what we just loaded
// wake the main thread? not needed, it has nothing to do
// wake(WM_APP_LOADED);
stb_sem_release(decode_queue);
}
}
}
o("READ: Finished command\n");
}
}
#define MAX_CACHED_IMAGES 200
volatile ImageFile cache[MAX_CACHED_IMAGES];
void make_image(Image *z, int image_x, int image_y, uint8 *image_data, int image_n);
volatile int decoder_idle = TRUE;
volatile ImageFile *decoder_choose(void)
{
int i, best_lru=0;
volatile ImageFile *best = NULL;
start:
for (i=0; i < MAX_CACHED_IMAGES; ++i) {
if (cache[i].status == LOAD_reading_done) {
if (cache[i].lru > best_lru) {
best = &cache[i];
best_lru = best->lru;
}
}
}
if (best) {
int retry = FALSE;
stb_mutex_begin(cache_mutex);
if (best->status == LOAD_reading_done)
best->status = LOAD_decoding;
else
retry = TRUE;
stb_mutex_end(cache_mutex);
if (retry) goto start;
}
return best;
}
void *decode_task(void *p)
{
for(;;) {
volatile ImageFile *f;
f = decoder_choose();
if (f == NULL) {
o("DECODE: blocking\n");
stb_sem_waitfor(decode_queue);
o("DECODE: woken\n");
} else {
int x,y,n;
uint8 *data;
assert(f->status == LOAD_decoding);
o("DECIDE: decoding %s\n", f->filename);
data = stbi_load_from_memory(f->filedata, f->len, &x, &y, &n, BPP);
decoder_idle = TRUE;
o("DECODE: decoded %s\n", f->filename);
free(f->filedata);
f->filedata = NULL;
if (data == NULL) {
f->error = strdup(stbi_failure_reason());
barrier();
f->status = LOAD_error_reading;
} else {
f->image = (Image *) malloc(sizeof(*f->image));
make_image(f->image, x,y,data,n);
barrier();
f->status = LOAD_available;
// wake up the main thread in case this new data is useful
wake(WM_APP_DECODED);
}
}
}
}
Image *source;
ImageFile *source_c;
Image *bmp_alloc(int x, int y)
{
Image *i = malloc(sizeof(*i));
if (!i) return NULL;
i->x = x;
i->y = y;
i->stride = x*BPP;
i->stride += (-i->stride) & 3;
i->pixels = malloc(i->stride * i->y);
i->frame = 0;
if (i->pixels == NULL) { free(i); return NULL; }
return i;
}
void make_image(Image *z, int image_x, int image_y, uint8 *image_data, int image_n)
{
int i;
z->pixels = image_data;
z->x = image_x;
z->y = image_y;
z->stride = image_x*BPP;
z->frame = 0;
// swap RGB to BGR
for (i=0; i < image_x*image_y*BPP; i += BPP) {
unsigned char t = image_data[i+0];
image_data[i+0] = image_data[i+2];
image_data[i+2] = t;
#if BPP==4
if (image_n == 4) {
// apply alpha
unsigned char *p = image_data+i;
int a = (255-p[3]);
p[0] += (((200 - (int) p[0])*a)>>8);
p[1] += (((100 - (int) p[1])*a)>>8);
p[2] += (((200 - (int) p[2])*a)>>8);
}
#endif
}
}
void frame(Image *z)
{
int i;
z->frame = FRAME;
memset(z->pixels, 0, FRAME*z->stride);
memset(z->pixels + z->stride*(z->y-FRAME), 0, FRAME*z->stride);
#ifdef GREY
memset(z->pixels + z->stride*FRAME2 + FRAME2*BPP, GREY, (z->x-FRAME2*2)*BPP);
memset(z->pixels + z->stride*(z->y-FRAME2-1) + FRAME2*BPP, GREY, (z->x-FRAME2*2)*BPP);
#endif
for (i=FRAME; i < z->y-FRAME; ++i) {
memset(z->pixels + i*z->stride, 0, FRAME*BPP);
memset(z->pixels + i*z->stride + (z->x-FRAME)*BPP, 0, FRAME*BPP);
}
#ifdef GREY
for (i=2; i < z->y-2; ++i) {
memset(z->pixels + i*z->stride+FRAME2*BPP, GREY, BPP);
memset(z->pixels + i*z->stride + (z->x-FRAME2-1)*BPP, GREY, BPP);
}
#endif
}
void imfree(Image *x)
{
free(x->pixels);
free(x);
}
Image image_region(Image *p, int x, int y, int w, int h)
{
Image q;
q.stride = p->stride;
q.x = w;
q.y = h;
q.pixels = p->pixels + y*p->stride + x*BPP;
return q;
}
static void image_resize(Image *dest, Image *src, ImageFile *cache);
Image *cur;
void display(HWND win, HDC hdc)
{
RECT rect,r2;
HBRUSH b = GetStockObject(BLACK_BRUSH);
int w,h,x,y;
GetClientRect(win, &rect);
w = rect.right - rect.left;
h = rect.bottom - rect.top;
x = (w - cur->x) >> 1;
y = (h - cur->y) >> 1;
platformDrawBitmap(hdc, x,y,cur->pixels, cur->x, cur->y, cur->stride);
// draw in the borders
r2 = rect;
r2.right = x; FillRect(hdc, &r2, b); r2=rect;
r2.left = x + cur->x; FillRect(hdc, &r2, b); r2 = rect;
r2.left = x;
r2.right = x+cur->x;
r2.bottom = y; FillRect(hdc, &r2, b); r2 = rect;
r2.left = x;
r2.right = x+cur->x;
r2.top = y + cur->y; FillRect(hdc, &r2, b);
}
typedef struct
{
int x,y;
int w,h;
} queued_size;
queued_size qs;
struct
{
queued_size size;
Image *image;
} pending_resize;
typedef struct
{
ImageFile *src;
Image dest;
Image *result;
} Resize;
Resize res;
void * work_resize(void *p)
{
Resize *r = (Resize *) p;
image_resize(&r->dest, r->src->image, r->src);
return r->result;
}
stb_workqueue *resize_workers;
void compute_size(int gw, int gh, int sw, int sh, int *ox, int *oy)
{
gw -= FRAME*2;
gh -= FRAME*2;
sw -= FRAME*2;
sh -= FRAME*2;
if (gw*sh > gh*sw) {
*oy = gh;
*ox = gh * sw/sh;
} else {
*ox = gw;
*oy = gw * sh/sw;
}
}
void queue_resize(int w, int h, ImageFile *src_c, int immediate)
{
Image *src = src_c->image;
Image *dest;
int w2,h2;
if (!immediate) assert(pending_resize.size.w);
// create (w2,h2) matching aspect ratio of w/h
w -= FRAME*2;
h -= FRAME*2;
if (w*src->y > h*src->x) {
h2 = h;
w2 = h2 * src->x / src->y;
} else {
w2 = w;
h2 = w2 * src->y / src->x;
}
assert(w2 >= 0 && h2 >= 0);
dest = bmp_alloc(w2+FRAME*2,h2+FRAME*2); assert(dest);
frame(dest);
res.src = src_c;
res.dest = image_region(dest, FRAME, FRAME, w2, h2);
res.result = dest;
if (!immediate) {
src_c->status = LOAD_resizing;
pending_resize.image = NULL;
stb_workq(resize_workers, work_resize, &res, &pending_resize.image);
} else {
image_resize(&res.dest, src, NULL);
pending_resize.image = res.result;
res.result = NULL;
}
}
void enqueue_resize(int left, int top, int width, int height)
{
if ((width == cur->x && height >= cur->y) || (height == cur->y && width >= cur->x)) {
// no resize necessary, just a variant of the current shape
MoveWindow(win, left, top, width, height, TRUE);
InvalidateRect(win, NULL, FALSE);
} else {
qs.x = left;
qs.y = top;
qs.w = width;
qs.h = height;
}
}
void ideal_window_size(int w, int h, int *w_ideal, int *h_ideal, int *x, int *y);
void update_source(ImageFile *q)
{
Image *z = q->image;
int w2,h2;
int w,h,x,y;
source = z;
source_c = q;
w2 = source->x+FRAME*2, h2 = source->y+FRAME*2;
ideal_window_size(w2,h2, &w,&h, &x,&y);
if (w == source->x+FRAME*2 && h == source->y+FRAME*2) {
int j;
unsigned char *p = z->pixels;
imfree(cur);
cur = bmp_alloc(z->x + FRAME*2, z->y + FRAME*2);
frame(cur);
{
for (j=0; j < z->y; ++j) {
unsigned char *q = cur->pixels + (j+FRAME)*cur->stride + FRAME*BPP;
memcpy(q, p, z->x*BPP);
p += z->x*BPP;
}
}
MoveWindow(win, x,y,w,h, TRUE);
InvalidateRect(win, NULL, FALSE);
} else {
qs.x = x;
qs.y = y;
qs.w = w;
qs.h = h;
}
}
char path_to_file[4096], *filename;
char **image_files;
int cur_loc = -1;
struct
{
char *filename;
int lru;
} *fileinfo;
stb_sdict *file_cache;
void free_fileinfo(void)
{
int i;
for (i=0; i < stb_arr_len(fileinfo); ++i)
free(fileinfo[i].filename);
stb_arr_free(fileinfo);
fileinfo = NULL;
}
void init_filelist(void)
{
char *s = NULL;
int i;
if (fileinfo) {
filename = s = strdup(fileinfo[cur_loc].filename);
free_fileinfo();
}
image_files = stb_readdir_files_mask(path_to_file, "*.jpg;*.jpeg;*.png;*.bmp");
if (image_files == NULL) error("Error: couldn't read directory.");
cur_loc = 0;
stb_arr_setlen(fileinfo, stb_arr_len(image_files));
for (i=0; i < stb_arr_len(image_files); ++i) {
fileinfo[i].filename = image_files[i];
fileinfo[i].lru = 0;
if (!stricmp(image_files[i], filename))
cur_loc = i;
}
if (s) free(s);
}
int lru_stamp=1;
int max_cache_bytes = 256 * (1 << 20); // 256 MB; one 5MP image is 20MB
#define MIN_CACHE 3 // always keep 3 images cached, to allow prefetching
int ImageFilePtrCompare(const void *p, const void *q)
{
ImageFile *a = *(ImageFile **) p;
ImageFile *b = *(ImageFile **) q;
return (a->lru < b->lru) ? -1 : (a->lru > b->lru);
}
void flush_cache(int locked)
{
int limit;
volatile ImageFile *list[MAX_CACHED_IMAGES];
int i, total=0, occupied_slots=0, n=0;
for (i=0; i < MAX_CACHED_IMAGES; ++i) {
volatile ImageFile *z = &cache[i];
if (z->status != LOAD_unused)
++occupied_slots;
if (MAIN_OWNS(z)) {
if (z->status == LOAD_available) {
total += z->image->stride * z->image->y;
} else if (z->status == LOAD_reading_done) {
total += z->len;
}
list[n++] = z;
}
}
limit = MAX_CACHED_IMAGES - MIN_CACHE;
if (total > max_cache_bytes || occupied_slots > limit) {
qsort((void *) list, n, sizeof(*list), ImageFilePtrCompare);
if (!locked) stb_mutex_begin(cache_mutex);
for (i=0; i < n && occupied_slots > MIN_CACHE && (occupied_slots > limit || total > max_cache_bytes); ++i) {
ImageFile p;
/* @TODO: this is totally squirrely and probably buggy. we need to
* rethink how we can propose things to the disk loader and then
* later change our minds. is this mutex good enough?
*/
{
p.status = list[i]->status;
if (MAIN_OWNS(&p) && p.status != LOAD_unused) {
p = *list[i];
list[i]->bail = 1; // force disk to bail if it gets this -- can't happen?
list[i]->filename = NULL;
list[i]->filedata = NULL;
list[i]->len = 0;
list[i]->image = NULL;
list[i]->error = NULL;
list[i]->status = LOAD_unused;
}
}
if (MAIN_OWNS(&p) && p.status != LOAD_unused) {
if (!locked) stb_mutex_end(cache_mutex);
o("MAIN: freeing cache: %s\n", p.filename);
stb_sdict_remove(file_cache, p.filename, NULL);
--occupied_slots; // occupied slots
if (p.status == LOAD_available)
total -= p.image->stride * p.image->y;
else if (p.status == LOAD_reading_done)
total -= p.len;
free(p.filename);
if (p.filedata) free(p.filedata);
if (p.image) imfree(p.image);
if (p.error) free(p.error);
if (!locked) stb_mutex_begin(cache_mutex);
}
}
if (!locked) stb_mutex_end(cache_mutex);
o("Reduced to %d megabytes\n", total >> 20);
}
}
int wrap(int z)
{
int n = stb_arr_len(image_files);
if (z < 0) return z + n;
while (z >= n) z = z - n;
return z;
}
void queue_disk_command(DiskCommand *dc, int which, int make_current)
{
volatile ImageFile *z;
// check if we already have it cached
filename = fileinfo[which].filename;
z = stb_sdict_get(file_cache, filename);
if (z) {
// we already have a cache slot for this entry.
z->lru = fileinfo[which].lru;
if (!MAIN_OWNS(z)) {
// it's being loaded/decoded
return;
}
if (z->status == LOAD_available) {
if (make_current)
update_source((ImageFile *) z);
return;
}
if (z->status != LOAD_inactive) {
// there was an error loading it... @todo, display the error
return;
}
// it's a go, use z
} else {
int i,tried_again=FALSE;
// find a cache slot
try_again:
for (i=0; i < MAX_CACHED_IMAGES; ++i)
if (cache[i].status == LOAD_unused)
break;
if (i == MAX_CACHED_IMAGES) {
if (tried_again) {
stb_fatal("Internal logic error: no free cache slots, but flush_cache() should free a few");
}
tried_again = TRUE;
flush_cache(TRUE);
goto try_again;
}
z = &cache[i];
free(z->filename);
z->filename = strdup(filename);
z->lru = 0;
z->status = LOAD_inactive;
stb_sdict_add(file_cache, filename, (void *) z);
}
assert(z->status == LOAD_inactive);
z->status = LOAD_inactive;
z->image = NULL;
z->bail = 0;
z->lru = fileinfo[which].lru;
dc->files[dc->num_files++] = (ImageFile *) z;
}
void advance(int dir)
{
DiskCommand dc;
int i;
if (image_files == NULL)
init_filelist();
cur_loc = wrap(cur_loc + dir);
// set adjacent files to previous lru value, so they're 2nd-highest priority
fileinfo[wrap(cur_loc-1)].lru = lru_stamp;
fileinfo[wrap(cur_loc+1)].lru = lru_stamp;
// set this file to new value
fileinfo[cur_loc].lru = ++lru_stamp;
// need to grab the cache
stb_mutex_begin(cache_mutex);
dc.num_files = 0;
queue_disk_command(&dc, cur_loc, 1); // first thing to load: this file
if (dir) {
queue_disk_command(&dc, wrap(cur_loc+dir), 0); // second thing to load: the next file (preload)
queue_disk_command(&dc, wrap(cur_loc-dir), 0); // last thing to load: the previous file (in case it got skipped when they went fast)
}
if (dc.num_files) {
dc_shared = dc;
stb_sem_release(disk_command_queue);
}
stb_mutex_end(cache_mutex);
// tell loader not to bother with old data
for (i=0; i < MAX_CACHED_IMAGES; ++i)
if (cache[i].lru < lru_stamp-1)
cache[i].bail = 1;
}
static char filenamebuffer[4096];
void open_file(void)
{
OPENFILENAME o;
memset(&o, 0, sizeof(o));
o.lStructSize = sizeof(o);
o.lpstrFilter = "Image Files\0*.jpg;*.jpeg;*.png;*.bmp\0";
o.lpstrFile = filenamebuffer;
filenamebuffer[0] = 0;
o.nMaxFile = sizeof(filenamebuffer);
if (!GetOpenFileName(&o))
return;
filename = filenamebuffer;
stb_fixpath(filename);
stb_splitpath(path_to_file, filename, STB_PATH);
init_filelist();
advance(0);
}
#define int(x) ((int) (x))
void resize(int step)
{
// first characterize the current size relative to the raw size
int x = source->x, y = source->y;
float s;
int x2,y2;
int zoom=0;
if (cur->x > source->x + FRAME*2 || cur->y > source->y + FRAME*2) {
for(;;) {
s = (float) pow(2, zoom/2.0f + 0.25f);
x2 = int(x*s);
y2 = int(y*s);
if (cur->x < x2 + FRAME*2 || cur->y < y2 + FRAME*2)
break;
++zoom;
}
} else {
for(;;) {
s = (float) pow(2, zoom/2.0f - 0.25f);
x2 = int(x*s);
y2 = int(y*s);
if (cur->x > x2 + FRAME*2 || cur->y > y2 + FRAME*2)
break;
--zoom;
}
}
// now resize
do {
zoom += step;
s = (float) pow(2, zoom/2.0);
if (x*s < 4 || y*s < 4 || x*s > 4000 || y*s > 3000)
return;
x2 = int(x*s) + 2*FRAME;
y2 = int(y*s) + 2*FRAME;
} while (x2 == cur->x || y2 == cur->y);
{
RECT rect;
GetWindowRect(win, &rect);
x = (rect.left + rect.right)>>1;
y = (rect.top + rect.bottom)>>1;
x -= x2>>1;
y -= y2>>1;
enqueue_resize(x,y,x2,y2);
}
}
enum
{
MODE_none,
MODE_drag,
MODE_resize,
} dragmode;
#define setmode(x) (dragmode = x)
#define ismode(x) (dragmode == x)
#define anymode() !ismode(MODE_none)
static int ex,ey; // original mousedown location for snapping to that
static int ex2,ey2; // original mousedown location relative to bottom right
static int wx,wy;
static int rx,ry,rx2,ry2;
static void cursor_regions(int *x0, int *y0, int *x1, int *y1)
{
RECT rect;
int w,h,w2,h2;
GetWindowRect(win, &rect);
w = rect.right - rect.left;
h = rect.bottom - rect.top;
// compute size of handles
w2 = w >> 4; h2 = h >> 4;
if (w2 < 12) {
w2 = w >> 2;
if (w2 < 4) w2 = w >> 1;
}
if (h2 < 12) {
h2 = h >> 2;
if (h2 < 4) h2 = h >> 1;
}
if (h2 < w2) w2 = h2;
if (w2 < h2) h2 = w2;
*x0 = w2;
*x1 = w - w2;
*y0 = h2;
*y1 = h - h2;
}
HCURSOR c_def, c_ne_sw, c_e_w, c_nw_se, c_n_s;
void set_cursor(int x, int y)
{
int x0,y0,x1,y1;
cursor_regions(&x0,&y0,&x1,&y1);
if (x < x0 && y < y0) SetCursor(c_nw_se);
else if (x > x1 && y > y1) SetCursor(c_nw_se);
else if (x > x1 && y < y0) SetCursor(c_ne_sw);
else if (x < x0 && y > y1) SetCursor(c_ne_sw);
else if (x < x0 || x > x1) SetCursor(c_e_w);
else if (y < y0 || y > y1) SetCursor(c_n_s);
else SetCursor(c_def);
}
void mouse(UINT ev, int x, int y)
{
switch (ev) {
case WM_LBUTTONDOWN:
if (!anymode()) {
RECT rect;
int x0,y0,x1,y1;
cursor_regions(&x0,&y0,&x1,&y1);
rx = ry = 0;
if (x < x0) rx = -1;
if (x > x1) rx = 1;
if (y < y0) ry = -1;
if (y > y1) ry = 1;
if (rx || ry)
setmode(MODE_resize);
else
setmode(MODE_drag);
SetCapture(win);
GetWindowRect(win, &rect);
ex = x;
ey = y;
ex2 = x - (rect.right-rect.left);
ey2 = y - (rect.bottom-rect.top);
}
break;
case WM_MOUSEMOVE:
switch(dragmode) {
default: assert(0);
case MODE_none:
break;
case MODE_drag: {
RECT rect;
GetWindowRect(win, &rect);
MoveWindow(win, rect.left + x-ex, rect.top + y-ey, rect.right - rect.left, rect.bottom - rect.top, TRUE);
set_cursor(x,y);
break;
}
case MODE_resize: {
RECT rect;
GetWindowRect(win, &rect);
assert(rx || ry);
#define LIMIT 16
if (rx < 0) rect.left = stb_min(rect.left+x-ex, rect.right+-LIMIT);
if (rx > 0) rect.right = stb_max(rect.left+LIMIT, rect.left+x-ex2);
if (ry < 0) rect.top = stb_min(rect.top+y-ey, rect.bottom-LIMIT);
if (ry > 0) rect.bottom = stb_max(rect.top+LIMIT, rect.top+y-ey2);
enqueue_resize(rect.left, rect.top, rect.right-rect.left, rect.bottom-rect.top);
break;
}
}
break;
case WM_RBUTTONUP:
if (!anymode())
exit(0);
// otherwise, disrupt a modal operation
/* FALLTHROUGH */
case WM_LBUTTONUP:
ReleaseCapture();
setmode(MODE_none);
set_cursor(x,y);
break;
}
}
#ifndef VK_OEM_PLUS
#define VK_OEM_PLUS 0xbb
#define VK_OEM_MINUS 0xbd
#endif
int best_lru = 0;
int WINAPI MainWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg) {
case WM_CREATE: {
win = hWnd;
break;
}
case WM_APP_DECODED: {
// scan the filelist for the highest-lru, decoded image
int i;
ImageFile *best = NULL;
for (i=0; i < stb_arr_len(fileinfo); ++i) {
if (fileinfo[i].lru > best_lru) {
ImageFile *z = stb_sdict_get(file_cache, fileinfo[i].filename);
if (z && z->status == LOAD_available) {
assert(z->image != NULL);
best = z;
best_lru = fileinfo[i].lru;
}
}
}
if (best) {
update_source(best);
}
flush_cache(FALSE);
break;
}
case WM_MOUSEMOVE:
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_LBUTTONUP:
case WM_RBUTTONUP:
mouse(uMsg, (short) LOWORD(lParam), (short) HIWORD(lParam));
return 0;
case WM_SETCURSOR: {
POINT p;
if (GetCursorPos(&p)) {
RECT rect;
GetWindowRect(win, &rect);
set_cursor(p.x - rect.left, p.y - rect.top);
return TRUE;
}
return FALSE;
}
case WM_PAINT: {
PAINTSTRUCT ps;
hDC = BeginPaint(hWnd, &ps);
display(hWnd, hDC);
EndPaint(hWnd, &ps);
return 0;
}
#define MY_SHIFT (1 << 16)
#define MY_CTRL (1 << 17)
#define MY_ALT (1 << 18)
case WM_CHAR: {
int code = (GetKeyState(VK_SHIFT) < 0 ? MY_SHIFT : 0)
| (GetKeyState(VK_CONTROL) < 0 ? MY_CTRL : 0);
code += wParam;
switch (wParam) {
case 27:
exit(0);
case ' ': // space
advance(1);
break;
case 0x08: // backspace
advance(-1);
break;
default:
return 1;
}
return 0;
}
case WM_KEYDOWN:
case WM_SYSKEYDOWN: {
int code =(GetKeyState(VK_SHIFT) < 0 ? MY_SHIFT : 0)
| (GetKeyState(VK_CONTROL) < 0 ? MY_CTRL : 0)
| (GetKeyState(VK_MENU ) < 0 ? MY_ALT : 0);
code += wParam;
switch (code) {
case VK_RIGHT:
case VK_NUMPAD6:
advance(1);
break;
case VK_LEFT:
case VK_NUMPAD4:
advance(-1);
break;
case MY_CTRL | VK_OEM_PLUS:
case MY_CTRL | MY_SHIFT | VK_OEM_PLUS:
resize(1);
break;
case MY_CTRL | VK_OEM_MINUS:
resize(-1);
break;
case MY_CTRL | 'O':
open_file();
break;
case MY_ALT | '\r':
// alt-enter
break;
default:
return DefWindowProc (hWnd, uMsg, wParam, lParam);
}
break;
}
case WM_DESTROY:
PostQuitMessage (0);
break;
default:
return DefWindowProc (hWnd, uMsg, wParam, lParam);
}
return 1;
}
int resize_threads;
void ideal_window_size(int w, int h, int *w_ideal, int *h_ideal, int *x, int *y)
{
int cx = GetSystemMetrics(SM_CXVIRTUALSCREEN);
int cy = GetSystemMetrics(SM_CYVIRTUALSCREEN);
int cx2 = GetSystemMetrics(SM_CXSCREEN);
int cy2 = GetSystemMetrics(SM_CYSCREEN);
if (w <= cx2 && h <= cy2) {
*w_ideal = w;
*h_ideal = h;
} else if (w - FRAME*2 <= cx2 && h - FRAME*2 <= cy2) {
*w_ideal = w;
*h_ideal = h;
} else {
// will we show more if we use the full desktop?
int w1,h1,w2,h2;
compute_size(cx ,cy ,w,h,&w1,&h1);
compute_size(cx2,cy2,w,h,&w2,&h2);
if (h1 > h2*1.25 || w1 > w2*1.25) {
*w_ideal = stb_min(cx,w1);
*h_ideal = stb_min(cy,h1);
} else {
*w_ideal = stb_min(cx2,w2);
*h_ideal = stb_min(cy2,h2);
}
// compute actual size image will be
compute_size(*w_ideal, *h_ideal, w,h, &w,&h);
}
if ((cx != cx2 || cy != cy2) && w <= cx2+FRAME*2 && h <= cy2+FRAME*2) {
*x = (cx2 - w) >> 1;
*y = (cy2 - h) >> 1;
} else {
*x = (cx - w) >> 1;
*y = (cy - h) >> 1;
}
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
char filenamebuffer[4096];
int argc;
char **argv = stb_tokens_quoted(lpCmdLine, " ", &argc);
MEMORYSTATUS mem;
MSG msg;
WNDCLASSEX wndclass;
HWND hWnd;
int physmem;
int image_x, image_y;
unsigned char *image_data;
int image_n;
resize_threads = stb_processor_count();
do_debug = IsDebuggerPresent();
hInst = hInstance;
GlobalMemoryStatus(&mem);
physmem = mem.dwTotalPhys;
/* Register the frame class */
memset(&wndclass, 0, sizeof(wndclass));
wndclass.cbSize = sizeof(wndclass);
wndclass.style = CS_OWNDC;
wndclass.lpfnWndProc = (WNDPROC)MainWndProc;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(hInstance, szAppName);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = GetStockObject(BLACK_BRUSH);
wndclass.lpszMenuName = szAppName;
wndclass.lpszClassName = szAppName;
wndclass.hIconSm = LoadIcon(hInstance, szAppName);
c_def = LoadCursor(NULL, IDC_ARROW);
c_nw_se = LoadCursor(NULL, IDC_SIZENWSE);
c_ne_sw = LoadCursor(NULL, IDC_SIZENESW);
c_e_w = LoadCursor(NULL, IDC_SIZEWE);
c_n_s = LoadCursor(NULL, IDC_SIZENS);
if (!RegisterClassEx(&wndclass))
return FALSE;
if (argc < 1) {
OPENFILENAME o;
memset(&o, 0, sizeof(o));
o.lStructSize = sizeof(o);
o.lpstrFilter = "Image Files\0*.jpg;*.jpeg;*.png;*.bmp\0";
o.lpstrFile = filenamebuffer;
filenamebuffer[0] = 0;
o.nMaxFile = sizeof(filenamebuffer);
if (!GetOpenFileName(&o))
return 0;
filename = filenamebuffer;
} else {
filename = argv[0];
}
resize_workers = stb_workq_new(resize_threads, resize_threads * 4);
cache_mutex = stb_mutex_new();
disk_command_queue = stb_sem_new(1,1);
decode_queue = stb_sem_new(1,1);
decode_mutex = stb_mutex_new();
image_data = stbi_load(filename, &image_x, &image_y, &image_n, BPP);
if (image_data == NULL) {
char *why = stbi_failure_reason();
char buffer[512];
sprintf(buffer, "'%s': %s", filename, why);
error(buffer);
exit(0);
}
stb_fixpath(filename);
stb_splitpath(path_to_file, filename, STB_PATH);
stb_create_thread(diskload_task, NULL);
stb_create_thread(decode_task, NULL);
source = malloc(sizeof(*source));
make_image(source, image_x, image_y, image_data, image_n);
cache[0].status = LOAD_available;
cache[0].image = source;
cache[0].lru = lru_stamp++;
cache[0].filename = strdup(filename);
file_cache = stb_sdict_new(1);
stb_sdict_add(file_cache, filename, (void *) &cache[0]);
source_c = (ImageFile *) &cache[0];
{
int x,y;
int w2 = source->x+FRAME*2, h2 = source->y+FRAME*2;
int w,h;
ideal_window_size(w2,h2, &w,&h, &x,&y);
if (w == source->x+FRAME*2 && h == source->y+FRAME*2) {
cur = bmp_alloc(image_x + FRAME*2, image_y + FRAME*2);
frame(cur);
{
int j;
unsigned char *p = image_data;
for (j=0; j < image_y; ++j) {
unsigned char *q = cur->pixels + (j+FRAME)*cur->stride + FRAME*BPP;
memcpy(q, p, image_x*BPP);
p += image_x*BPP;
}
}
w=w;
} else {
// size is not an exact match
queue_resize(w,h, (ImageFile *) &cache[0], TRUE);
cur = pending_resize.image;
pending_resize.image = NULL;
}
wx = w;
wy = h;
hWnd = CreateWindow(szAppName, displayName,
WS_POPUP,
x,y, w, h,
NULL, NULL, hInstance, NULL);
}
if (!hWnd)
return FALSE;
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
InvalidateRect(hWnd, NULL, TRUE);
for(;;) {
// if we're not currently resizing, start a resize
if (qs.w && pending_resize.size.w == 0) {
if ((qs.w == cur->x && qs.h >= cur->y) || (qs.h == cur->y && qs.w >= cur->x)) {
// no resize necessary, just a variant of the current shape
MoveWindow(win, qs.x,qs.y,qs.w,qs.h, TRUE);
InvalidateRect(win, NULL, FALSE);
} else {
o("Enqueueing resize\n");
pending_resize.size = qs;
queue_resize(qs.w, qs.h, source_c, FALSE);
}
qs.w = 0;
}
if (!PeekMessage(&msg, NULL, 0,0, PM_NOREMOVE)) {
// no messages, so check for pending activity
if (pending_resize.size.w) {
// there's a resize pending, so don't block
if (!pending_resize.image) {
Sleep(10);
} else {
o("Finished resize\n");
imfree(cur);
cur = pending_resize.image;
SetWindowPos(hWnd,NULL,pending_resize.size.x, pending_resize.size.y, pending_resize.size.w, pending_resize.size.h, SWP_NOZORDER);
barrier();
pending_resize.size.w = 0;
display(hWnd, hDC);
}
continue;
}
}
if (!GetMessage(&msg, NULL, 0, 0))
return msg.wParam;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
#define MAGIC (1.5 * (1 << 26) * (1 << 26))
double temp;
#define FAST_FLOAT_TO_INT(x) ((q->temp = (x) + MAGIC), *(int *)&q->temp)
#define toint(x) ((int) (x)) // FAST_FLOAT_TO_INT(x)
typedef struct {
short i;
unsigned char f;
} SplitPoint;
SplitPoint point_buffer[3200];
typedef struct
{
double temp;
Image *dest;
Image *src;
ImageFile *src_c;
SplitPoint *p;
int j0,j1;
float dy;
int done;
} ImageProcess;
#define CACHE_REBLOCK 64
void *image_resize_work(ImageProcess *q)
{
int i,j,k,n=0;
Image *dest = q->dest, *src = q->src;
SplitPoint *p = q->p;
float y, y0 = q->dy * q->j0;
for (k=0; k < dest->x; k += CACHE_REBLOCK) {
int k2 = stb_min(k + CACHE_REBLOCK, dest->x);
y = y0;
for (j=q->j0; j < q->j1; ++j) {
int iy;
int fy;
y = q->dy * j;
iy = (int) floor(y);
fy = (int) floor(255.9f*(y - iy));
if (iy >= src->y-1) {
iy = src->y-2;
fy = 255;
}
{
unsigned char *d = &dest->pixels[j*dest->stride + k*BPP];
unsigned char *s0 = src->pixels + src->stride*iy;
unsigned char *s1 = s0 + src->stride;
for (i=k; i < k2; ++i) {
s0 += p[i].i;
s1 += p[i].i;
{
unsigned char x = p[i].f;
#if BPP == 4
uint32 c00,c01,c10,c11,rb0,rb1,rb00,rb01,rb10,rb11,rb,g;
c00 = *(uint32 *) s0;
c01 = *(uint32 *) (s0+4);
c10 = *(uint32 *) s1;
c11 = *(uint32 *) (s1+4);
rb00 = c00 & 0xff00ff;
rb01 = c01 & 0xff00ff;
rb0 = (rb00 + (((rb01 - rb00) * x) >> 8)) & 0xff00ff;
rb10 = c10 & 0xff00ff;
rb11 = c11 & 0xff00ff;
rb1 = (rb10 + (((rb11 - rb10) * x) >> 8)) & 0xff00ff;
rb = (rb0 + (((rb1 - rb0) * fy) >> 8)) & 0xff00ff;
rb00 = c00 & 0xff00;
rb01 = c01 & 0xff00;
rb0 = (rb00 + (((rb01 - rb00) * x) >> 8)) & 0xff00;
rb10 = c10 & 0xff00;
rb11 = c11 & 0xff00;
rb1 = (rb10 + (((rb11 - rb10) * x) >> 8)) & 0xff00;
g = (rb0 + (((rb1 - rb0) * fy) >> 8)) & 0xff00;
*(uint32 *)d = rb + g;
#else
unsigned char v00,v01,v10,v11;
int v0,v1;
v00 = s0[0]; v01 = s0[BPP+0]; v10 = s1[0]; v11 = s1[BPP+0];
v0 = (v00<<8) + x * (v01 - v00);
v1 = (v10<<8) + x * (v11 - v10);
v0 = (v0<<8) + fy * (v1 - v0);
d[0] = v0 >> 16;
v00 = s0[1]; v01 = s0[BPP+1]; v10 = s1[1]; v11 = s1[BPP+1];
v0 = (v00<<8) + x * (v01 - v00);
v1 = (v10<<8) + x * (v11 - v10);
v0 = (v0<<8) + fy * (v1 - v0);
d[1] = v0 >> 16;
v00 = s0[2]; v01 = s0[BPP+2]; v10 = s1[2]; v11 = s1[BPP+2];
v0 = (v00<<8) + x * (v01 - v00);
v1 = (v10<<8) + x * (v11 - v10);
v0 = (v0<<8) + fy * (v1 - v0);
d[2] = v0 >> 16;
#endif
d += BPP;
}
}
}
y += q->dy;
}
}
q->done = TRUE;
return NULL;
}
volatile reentry;
void image_resize(Image *dest, Image *src, ImageFile *src_c)
{
ImageProcess proc_buffer[16], *q = stb_temp(proc_buffer, resize_threads * sizeof(*q));
SplitPoint *p = stb_temp(point_buffer, dest->x * sizeof(*p));
int i,j0,j1,k;
float x,dx,dy;
assert(reentry == 0);
assert(src->frame == 0);
++reentry;
dx = (float) (src->x - 1) / (dest->x - 1);
dy = (float) (src->y - 1) / (dest->y - 1);
x=0;
for (i=0; i < dest->x; ++i) {
p[i].i = (int) floor(x);
p[i].f = (int) floor(255.9f*(x - p[i].i));
if (p[i].i >= src->x-1) {
p[i].i = src->x-2;
p[i].f = 255;
}
x += dx;
p[i].i *= BPP;
}
for (k=0; k < dest->x; k += CACHE_REBLOCK) {
int k2 = stb_min(k+CACHE_REBLOCK, dest->x);
for (i=k2-1; i > k; --i) {
p[i].i -= p[i-1].i;
}
}
j0 = 0;
for (i=0; i < resize_threads; ++i) {
j1 = dest->y * (i+1) / resize_threads;
q[i].dest = dest;
q[i].src = src;
q[i].j0 = j0;
q[i].j1 = j1;
q[i].dy = dy;
q[i].p = p;
q[i].done = FALSE;
q[i].src_c = src_c;
j1 = j0;
}
if (resize_threads == 1) {
image_resize_work(q);
} else {
barrier();
for (i=1; i < resize_threads; ++i)
stb_workq(resize_workers, image_resize_work, q+i, NULL);
image_resize_work(q);
for(;;) {
for (i=1; i < resize_threads; ++i)
if (!q[i].done)
break;
if (i == resize_threads) break;
Sleep(10);
}
}
if(src_c) src_c->status = LOAD_available;
stb_tempfree(point_buffer, p);
stb_tempfree(proc_buffer , q);
--reentry;
}
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