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libcaca
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* examples/cacaview.c: 

+ Proper aspect ratio support.
    + Finer zoom support.
    + Handle mouse clicks as next/prev picture command.
    + Removed useless iterations in draw_checkers().
tags/v0.99.beta14
Sam Hocevar sam 21 years ago
parent
24b0e23466
commit
d2d39b2c51
1 changed files with 109 additions and 73 deletions
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  1. +109
    -73
      examples/cacaview.c

+ 109
- 73
examples/cacaview.c View File

@@ -44,11 +44,15 @@
#define STATUS_ANTIALIASING 2
#define STATUS_BACKGROUND 3

#define ZOOM_FACTOR 1.08f
#define ZOOM_MAX 50
#define PAD_STEP 0.15

/* Local functions */
static void set_zoom(int);
static void load_image(char const *);
static void unload_image(void);
static void draw_checkers(unsigned int, unsigned int,
unsigned int, unsigned int);
static void draw_checkers(int, int, int, int);
#if !defined(HAVE_IMLIB2_H)
static int freadint(FILE *);
static int freadshort(FILE *);
@@ -61,16 +65,19 @@ Imlib_Image image = NULL;
#endif
char *pixels = NULL;
struct caca_bitmap *bitmap = NULL;
int x, y;
unsigned int w, h, depth, bpp, rmask, gmask, bmask, amask;
#if !defined(HAVE_IMLIB2_H)
unsigned int red[256], green[256], blue[256], alpha[256];
#endif

float zoomtab[ZOOM_MAX + 1];
float xfactor = 1.0, yfactor = 1.0, dx = 0.5, dy = 0.5;
int zoom = 0, fullscreen = 0, ww, wh;

int main(int argc, char **argv)
{
int quit = 0, update = 1, help = 0, fullscreen = 0, status = 0;
int reload = 0, zoom = 0;
int quit = 0, update = 1, help = 0, status = 0;
int reload = 0;

char **list = NULL;
int current = 0, items = 0, opts = 1;
@@ -86,6 +93,14 @@ int main(int argc, char **argv)
/* Set the window title */
caca_set_window_title("cacaview");

ww = caca_get_width();
wh = caca_get_height();

/* Fill the zoom table */
zoomtab[0] = 1.0;
for(i = 0; i < ZOOM_MAX; i++)
zoomtab[i + 1] = zoomtab[i] * 1.08;

/* Load items into playlist */
for(i = 1; i < argc; i++)
{
@@ -111,22 +126,32 @@ int main(int argc, char **argv)
/* Go ! */
while(!quit)
{
int ww, wh;
unsigned int const event_mask = CACA_EVENT_KEY_PRESS
| CACA_EVENT_RESIZE
| CACA_EVENT_MOUSE_PRESS;
unsigned int event, new_status = 0, new_help = 0;

ww = caca_get_width();
wh = caca_get_height();

if(update)
event = caca_get_event(CACA_EVENT_KEY_PRESS | CACA_EVENT_RESIZE);
event = caca_get_event(event_mask);
else
event = caca_wait_event(CACA_EVENT_KEY_PRESS | CACA_EVENT_RESIZE);
event = caca_wait_event(event_mask);

while(event)
{
unsigned int key = event & 0x00ffffff;

if(key) switch(key)
if(event & CACA_EVENT_MOUSE_PRESS)
{
if((event & 0x00ffffff) == 1)
{
if(items) current = (current + 1) % items;
reload = 1;
}
else if((event & 0x00ffffff) == 2)
{
if(items) current = (items + current - 1) % items;
reload = 1;
}
}
else if(event & CACA_EVENT_KEY_PRESS) switch(event & 0x00ffffff)
{
case 'n':
case 'N':
@@ -142,6 +167,7 @@ int main(int argc, char **argv)
case 'F':
fullscreen = ~fullscreen;
update = 1;
set_zoom(zoom);
break;
case 'b':
i = 1 + caca_get_feature(CACA_BACKGROUND);
@@ -186,40 +212,44 @@ int main(int argc, char **argv)
update = 1;
break;
case '+':
zoom++;
if(zoom > 48) zoom = 48; else update = 1;
update = 1;
set_zoom(zoom + 1);
break;
case '-':
zoom--;
if(zoom < -48) zoom = -48; else update = 1;
update = 1;
set_zoom(zoom - 1);
break;
case 'x':
case 'X':
zoom = 0;
update = 1;
set_zoom(0);
break;
case 'k':
case 'K':
case CACA_KEY_UP:
if(zoom > 0) y -= 1 + h / (2 + zoom) / 8;
if(yfactor > 1.0) dy -= PAD_STEP / yfactor;
if(dy < 0.0) dy = 0.0;
update = 1;
break;
case 'j':
case 'J':
case CACA_KEY_DOWN:
if(zoom > 0) y += 1 + h / (2 + zoom) / 8;
if(yfactor > 1.0) dy += PAD_STEP / yfactor;
if(dy > 1.0) dy = 1.0;
update = 1;
break;
case 'h':
case 'H':
case CACA_KEY_LEFT:
if(zoom > 0) x -= 1 + w / (2 + zoom) / 8;
if(xfactor > 1.0) dx -= PAD_STEP / xfactor;
if(dx < 0.0) dx = 0.0;
update = 1;
break;
case 'l':
case 'L':
case CACA_KEY_RIGHT:
if(zoom > 0) x += 1 + w / (2 + zoom) / 8;
if(xfactor > 1.0) dx += PAD_STEP / xfactor;
if(dx > 1.0) dx = 1.0;
update = 1;
break;
case '?':
@@ -231,13 +261,13 @@ int main(int argc, char **argv)
quit = 1;
break;
}

if(event == CACA_EVENT_RESIZE)
else if(event == CACA_EVENT_RESIZE)
{
caca_refresh();
ww = caca_get_width();
wh = caca_get_height();
update = 1;
set_zoom(zoom);
}

if(status || new_status)
@@ -259,9 +289,6 @@ int main(int argc, char **argv)

buffer = malloc(len);

/* Reset image-specific runtime variables */
zoom = 0;

sprintf(buffer, " Loading `%s'... ", list[current]);
buffer[ww] = '\0';
caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
@@ -273,7 +300,11 @@ int main(int argc, char **argv)
unload_image();
load_image(list[current]);
reload = 0;

/* Reset image-specific runtime variables */
dx = dy = 0.5;
update = 1;
set_zoom(0);

free(buffer);
}
@@ -306,45 +337,26 @@ int main(int argc, char **argv)
caca_putstr((ww - strlen(buffer)) / 2, wh / 2, buffer);
free(buffer);
}
else if(zoom < 0)
{
int xo = (ww - 1) / 2;
int yo = (wh - 1) / 2;
int xn = (ww - 1) / (2 - zoom);
int yn = (wh - 1) / (2 - zoom);
draw_checkers(xo - xn, yo - yn, xo + xn, yo + yn);
caca_draw_bitmap(xo - xn, yo - yn, xo + xn, yo + yn,
bitmap, pixels);
}
else if(zoom > 0)
{
struct caca_bitmap *newbitmap;
int xn = w / (2 + zoom);
int yn = h / (2 + zoom);
if(x < xn) x = xn;
if(y < yn) y = yn;
if(xn + x > (int)w) x = w - xn;
if(yn + y > (int)h) y = h - yn;
newbitmap = caca_create_bitmap(bpp, 2 * xn, 2 * yn, depth * w,
rmask, gmask, bmask, amask);
#if !defined(HAVE_IMLIB2_H)
if(bpp == 8)
caca_set_bitmap_palette(newbitmap, red, green, blue, alpha);
#endif
draw_checkers(0, fullscreen ? 0 : 1,
ww - 1, fullscreen ? wh - 1 : wh - 3);
caca_draw_bitmap(0, fullscreen ? 0 : 1,
ww - 1, fullscreen ? wh - 1 : wh - 3,
newbitmap,
pixels + depth * (x - xn) + depth * w * (y - yn));
caca_free_bitmap(newbitmap);
}
else
{
draw_checkers(0, fullscreen ? 0 : 1,
ww - 1, fullscreen ? wh - 1 : wh - 3);
caca_draw_bitmap(0, fullscreen ? 0 : 1,
ww - 1, fullscreen ? wh - 1 : wh - 3,
float xdelta, ydelta;
int y, height;

y = fullscreen ? 0 : 1;
height = fullscreen ? wh : wh - 3;

xdelta = (xfactor > 1.0) ? dx : 0.5;
ydelta = (yfactor > 1.0) ? dy : 0.5;

draw_checkers(ww * (1.0 - xfactor) / 2,
y + height * (1.0 - yfactor) / 2,
ww * (1.0 + xfactor) / 2,
y + height * (1.0 + yfactor) / 2);

caca_draw_bitmap(ww * (1.0 - xfactor) * xdelta,
y + height * (1.0 - yfactor) * ydelta,
ww * (xdelta + (1.0 - xdelta) * xfactor),
y + height * (ydelta + (1.0 - ydelta) * yfactor),
bitmap, pixels);
}

@@ -408,6 +420,31 @@ int main(int argc, char **argv)
return 0;
}

static void set_zoom(int new_zoom)
{
int height;

zoom = new_zoom;

if(zoom > ZOOM_MAX) zoom = ZOOM_MAX;
if(zoom < -ZOOM_MAX) zoom = -ZOOM_MAX;

ww = caca_get_width();
height = fullscreen ? wh : wh - 3;

xfactor = (zoom < 0) ? 1.0 / zoomtab[-zoom] : zoomtab[zoom];
yfactor = xfactor * ww / height * h / w
* caca_get_height() / caca_get_width()
* caca_get_window_width() / caca_get_window_height();

if(yfactor > xfactor)
{
float tmp = xfactor;
xfactor = tmp * tmp / yfactor;
yfactor = tmp;
}
}

static void unload_image(void)
{
#if defined(HAVE_IMLIB2_H)
@@ -626,18 +663,17 @@ static void load_image(char const *name)
if(bpp == 8)
caca_set_bitmap_palette(bitmap, red, green, blue, alpha);
#endif

x = w / 2;
y = h / 2;
}

static void draw_checkers(unsigned int x1, unsigned int y1,
unsigned int x2, unsigned int y2)
static void draw_checkers(int x1, int y1, int x2, int y2)
{
unsigned int xn, yn;
int xn, yn;

if(x2 + 1 > (int)caca_get_width()) x2 = caca_get_width() - 1;
if(y2 + 1 > (int)caca_get_height()) y2 = caca_get_height() - 1;

for(yn = y1; yn <= y2; yn++)
for(xn = x1; xn <= x2; xn++)
for(yn = y1 > 0 ? y1 : 0; yn <= y2; yn++)
for(xn = x1 > 0 ? x1 : 0; xn <= x2; xn++)
{
if((((xn - x1) / 5) ^ ((yn - y1) / 3)) & 1)
caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_DARKGRAY);


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