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png: Change zoom in/out method and don't center the view on zoom.

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Don't recalculate resized width or height each time.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23847 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Teruaki Kawashima 2009-12-04 13:38:51 +00:00
parent 8db32ddfee
commit ce63faa8d4
1 changed files with 98 additions and 97 deletions
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169
apps/plugins/png/png.c
View file

@ -141,6 +141,7 @@ typedef struct LodePNG_Decoder
long error; long error;
char error_msg[128]; char error_msg[128];
int x,y; int x,y;
int width,height;
} LodePNG_Decoder; } LodePNG_Decoder;
#define VERSION_STRING "20080927" #define VERSION_STRING "20080927"
@ -1519,11 +1520,11 @@ int show_menu(void) /* return 1 to quit */
void draw_image(struct LodePNG_Decoder* decoder) void draw_image(struct LodePNG_Decoder* decoder)
{ {
rb->lcd_bitmap_part(resized_image, decoder->x, decoder->y, decoder->infoPng.width/ds /*stride*/, rb->lcd_bitmap_part(resized_image, decoder->x, decoder->y, decoder->width,
MAX(0, (LCD_WIDTH - (int)decoder->infoPng.width/(int)ds) / 2), MAX(0, (LCD_WIDTH - decoder->width) / 2),
MAX(0, (LCD_HEIGHT - (int)decoder->infoPng.height/(int)ds) / 2), MAX(0, (LCD_HEIGHT - decoder->height) / 2),
decoder->infoPng.width/ds - decoder->x, decoder->width - decoder->x,
decoder->infoPng.height/ds - decoder->y); decoder->height - decoder->y);
} }
/* Pan the viewing window right - move image to the left and fill in /* Pan the viewing window right - move image to the left and fill in
@ -1532,7 +1533,7 @@ static void pan_view_right(struct LodePNG_Decoder* decoder)
{ {
int move; int move;
move = MIN(HSCROLL, (int)(decoder->infoPng.width/ds) - decoder->x - LCD_WIDTH); move = MIN(HSCROLL, decoder->width - decoder->x - LCD_WIDTH);
if (move > 0) if (move > 0)
{ {
decoder->x += move; decoder->x += move;
@ -1578,7 +1579,7 @@ static void pan_view_down(struct LodePNG_Decoder* decoder)
{ {
int move; int move;
move = MIN(VSCROLL, (int)(decoder->infoPng.height/ds) - decoder->y - LCD_HEIGHT); move = MIN(VSCROLL, decoder->height - decoder->y - LCD_HEIGHT);
if (move > 0) if (move > 0)
{ {
decoder->y += move; decoder->y += move;
@ -1604,16 +1605,16 @@ int scroll_bmp(struct LodePNG_Decoder* decoder)
switch (button) switch (button)
{ {
case PNG_LEFT: case PNG_LEFT:
if (entries > 1 && decoder->infoPng.width/ds <= LCD_WIDTH if (entries > 1 && decoder->width <= LCD_WIDTH
&& decoder->infoPng.height/ds <= LCD_HEIGHT) && decoder->height <= LCD_HEIGHT)
return change_filename(DIR_PREV); return change_filename(DIR_PREV);
case PNG_LEFT | BUTTON_REPEAT: case PNG_LEFT | BUTTON_REPEAT:
pan_view_left(decoder); pan_view_left(decoder);
break; break;
case PNG_RIGHT: case PNG_RIGHT:
if (entries > 1 && decoder->infoPng.width/ds <= LCD_WIDTH if (entries > 1 && decoder->width <= LCD_WIDTH
&& decoder->infoPng.height/ds <= LCD_HEIGHT) && decoder->height <= LCD_HEIGHT)
return change_filename(DIR_NEXT); return change_filename(DIR_NEXT);
case PNG_RIGHT | BUTTON_REPEAT: case PNG_RIGHT | BUTTON_REPEAT:
pan_view_right(decoder); pan_view_right(decoder);
@ -1699,28 +1700,6 @@ int scroll_bmp(struct LodePNG_Decoder* decoder)
} /* while (true) */ } /* while (true) */
} }
/* set the view to the given center point, limit if necessary */
void set_view (struct LodePNG_Decoder* decoder, int cx, int cy)
{
int x, y;
/* plain center to available width/height */
x = cx - MIN(LCD_WIDTH, decoder->infoPng.width/ds) / 2;
y = cy - MIN(LCD_HEIGHT, decoder->infoPng.height/ds) / 2;
/* limit against upper image size */
x = MIN((int)(decoder->infoPng.width/ds) - LCD_WIDTH, x);
y = MIN((int)(decoder->infoPng.height/ds) - LCD_HEIGHT, y);
/* limit against negative side */
x = MAX(0, x);
y = MAX(0, y);
decoder->x = x; /* set the values */
decoder->y = y;
}
/* callback updating a progress meter while PNG decoding */ /* callback updating a progress meter while PNG decoding */
void cb_progress(int current, int total) void cb_progress(int current, int total)
{ {
@ -1776,18 +1755,14 @@ unsigned max_downscale(struct LodePNG_Decoder* decoder)
return downscale; return downscale;
} }
/* calculate the view center based on the bitmap position */
void get_view(struct LodePNG_Decoder* decoder, int* p_cx, int* p_cy)
{
*p_cx = decoder->x + MIN(LCD_WIDTH, decoder->infoPng.width/ds) / 2;
*p_cy = decoder->y + MIN(LCD_HEIGHT, decoder->infoPng.height/ds) / 2;
}
/* return decoded or cached image */ /* return decoded or cached image */
fb_data *get_image(struct LodePNG_Decoder* decoder) fb_data *get_image(struct LodePNG_Decoder* decoder, int ds)
{ {
fb_data * p_disp = disp[ds]; /* short cut */ fb_data * p_disp = disp[ds]; /* short cut */
decoder->width = decoder->infoPng.width / ds;
decoder->height = decoder->infoPng.height / ds;
if (p_disp != NULL) if (p_disp != NULL)
{ {
DEBUGF("Found an image in cache\n"); DEBUGF("Found an image in cache\n");
@ -1799,28 +1774,31 @@ fb_data *get_image(struct LodePNG_Decoder* decoder)
if (!running_slideshow) if (!running_slideshow)
{ {
rb->snprintf(print, sizeof(print), "resizing %d*%d", rb->snprintf(print, sizeof(print), "resizing %d*%d",
decoder->infoPng.width/ds, decoder->infoPng.height/ds); decoder->width, decoder->height);
rb->lcd_puts(0, 3, print); rb->lcd_puts(0, 3, print);
rb->lcd_update(); rb->lcd_update();
} }
static struct bitmap bmp_src, bmp_dst; static struct bitmap bmp_src, bmp_dst;
int size = (decoder->infoPng.width/ds) * (decoder->infoPng.height/ds); int size = decoder->width * decoder->height;
if ((unsigned char *)(disp_buf + size) >= memory_max) {
/* have to discard the current */
int i;
for (i=1; i<=8; i++)
disp[i] = NULL; /* invalidate all bitmaps */
/* start again from the beginning of the buffer */
disp_buf = (fb_data *)((intptr_t)(converted_image + converted_image_size + 3) & ~3);
}
disp[ds] = disp_buf; disp[ds] = disp_buf;
if ((unsigned char *)(disp[ds] + size) >= memory_max) {
//rb->splash(HZ, "Out of Memory");
// Still display the original image which is already decoded in RAM
disp[ds] = converted_image;
ds = 1;
return converted_image;
} else {
bmp_src.width = decoder->infoPng.width; bmp_src.width = decoder->infoPng.width;
bmp_src.height = decoder->infoPng.height; bmp_src.height = decoder->infoPng.height;
bmp_src.data = (unsigned char *)converted_image; bmp_src.data = (unsigned char *)converted_image;
bmp_dst.width = decoder->infoPng.width/ds; bmp_dst.width = decoder->width;
bmp_dst.height = decoder->infoPng.height/ds; bmp_dst.height = decoder->height;
bmp_dst.data = (unsigned char *)disp[ds]; bmp_dst.data = (unsigned char *)disp[ds];
#ifdef HAVE_ADJUSTABLE_CPU_FREQ #ifdef HAVE_ADJUSTABLE_CPU_FREQ
rb->cpu_boost(true); rb->cpu_boost(true);
@ -1831,7 +1809,6 @@ fb_data *get_image(struct LodePNG_Decoder* decoder)
#endif /*HAVE_ADJUSTABLE_CPU_FREQ*/ #endif /*HAVE_ADJUSTABLE_CPU_FREQ*/
disp_buf = (fb_data *)((intptr_t)(disp[ds] + size + 3) & ~3); disp_buf = (fb_data *)((intptr_t)(disp[ds] + size + 3) & ~3);
}
} else { } else {
disp[ds] = converted_image; disp[ds] = converted_image;
return converted_image; return converted_image;
@ -1840,6 +1817,34 @@ fb_data *get_image(struct LodePNG_Decoder* decoder)
return disp[ds]; return disp[ds];
} }
/* set the view to the given center point, limit if necessary */
void set_view (struct LodePNG_Decoder* decoder, int cx, int cy)
{
int x, y;
/* plain center to available width/height */
x = cx - MIN(LCD_WIDTH, decoder->width) / 2;
y = cy - MIN(LCD_HEIGHT, decoder->height) / 2;
/* limit against upper image size */
x = MIN(decoder->width - LCD_WIDTH, x);
y = MIN(decoder->height - LCD_HEIGHT, y);
/* limit against negative side */
x = MAX(0, x);
y = MAX(0, y);
decoder->x = x; /* set the values */
decoder->y = y;
}
/* calculate the view center based on the bitmap position */
void get_view(struct LodePNG_Decoder* decoder, int* p_cx, int* p_cy)
{
*p_cx = decoder->x + MIN(LCD_WIDTH, decoder->width) / 2;
*p_cy = decoder->y + MIN(LCD_HEIGHT, decoder->height) / 2;
}
/* load, decode, display the image */ /* load, decode, display the image */
int load_and_show(char* filename) int load_and_show(char* filename)
{ {
@ -1922,15 +1927,12 @@ int load_and_show(char* filename)
if (!decoder.error) { if (!decoder.error) {
if (!running_slideshow) { if (!running_slideshow) {
rb->snprintf(print, sizeof(print), "image %dx%d", decoder.infoPng.width, decoder.infoPng.height); rb->snprintf(print, sizeof(print), "image %dx%d",
decoder.infoPng.width, decoder.infoPng.height);
rb->lcd_puts(0, 2, print); rb->lcd_puts(0, 2, print);
rb->lcd_update(); rb->lcd_update();
} }
ds_max = max_downscale(&decoder); /* check display constraint */
ds = ds_max; /* initials setting */
if (!running_slideshow) if (!running_slideshow)
{ {
rb->snprintf(print, sizeof(print), "decoding %d*%d", rb->snprintf(print, sizeof(print), "decoding %d*%d",
@ -1948,14 +1950,6 @@ int load_and_show(char* filename)
#else #else
LodePNG_decode(&decoder, image, image_size, cb_progress); LodePNG_decode(&decoder, image, image_size, cb_progress);
#endif /*HAVE_ADJUSTABLE_CPU_FREQ*/ #endif /*HAVE_ADJUSTABLE_CPU_FREQ*/
disp_buf = (fb_data *)((intptr_t)(converted_image + converted_image_size + 3) & ~3);
ds_min = min_downscale(&decoder, memory_max - (unsigned char*)disp_buf); /* check memory constraint */
if (ds_min == 0) {
// Could not resize the image
ds_min = ds = ds_max = 1;
}
} }
} }
@ -2117,18 +2111,29 @@ int load_and_show(char* filename)
} }
} }
do { disp_buf = (fb_data *)((intptr_t)(converted_image + converted_image_size + 3) & ~3);
resized_image = get_image(&decoder); /* decode or fetch from cache */ ds_max = max_downscale(&decoder); /* check display constraint */
ds_min = min_downscale(&decoder, memory_max - (unsigned char*)disp_buf); /* check memory constraint */
if (ds_min == 0) {
/* Can not resize the image */
ds_min = ds_max = 1;
} else if (ds_max < ds_min) {
ds_max = ds_min;
}
ds = ds_max; /* initials setting */
cx = decoder.infoPng.width/ds/2; /* center the view */ cx = decoder.infoPng.width/ds/2; /* center the view */
cy = decoder.infoPng.height/ds/2; cy = decoder.infoPng.height/ds/2;
do {
resized_image = get_image(&decoder, ds); /* decode or fetch from cache */
set_view(&decoder, cx, cy); set_view(&decoder, cx, cy);
if (!running_slideshow) if (!running_slideshow)
{ {
rb->snprintf(print, sizeof(print), "showing %dx%d", rb->snprintf(print, sizeof(print), "showing %dx%d",
decoder.infoPng.width/ds, decoder.infoPng.height/ds); decoder.width, decoder.height);
rb->lcd_puts(0, 3, print); rb->lcd_puts(0, 3, print);
rb->lcd_update(); rb->lcd_update();
} }
@ -2145,16 +2150,14 @@ int load_and_show(char* filename)
status = scroll_bmp(&decoder); status = scroll_bmp(&decoder);
if (status == ZOOM_IN) if (status == ZOOM_IN)
{ {
if (ds > ds_min) if (ds > 1)
{ {
while (1) /* as 1/1 is always available, jump ds to 1 if ds is ds_min. */
{ int zoom = (ds == ds_min)? ds_min: 2;
ds /= 2; /* reduce downscaling to zoom in */ ds /= zoom; /* reduce downscaling to zoom in */
get_view(&decoder, &cx, &cy); get_view(&decoder, &cx, &cy);
cx *= 2; /* prepare the position in the new image */ cx *= zoom; /* prepare the position in the new image */
cy *= 2; cy *= zoom;
if (disp[ds] != converted_image || ds <= ds_min) break;
}
} }
else else
continue; continue;
@ -2164,14 +2167,12 @@ int load_and_show(char* filename)
{ {
if (ds < ds_max) if (ds < ds_max)
{ {
while (1) /* if ds is 1 and ds_min is greater than 1, jump ds to ds_min. */
{ int zoom = (ds < ds_min)? ds_min: 2;
ds *= 2; /* increase downscaling to zoom out */ ds *= zoom; /* increase downscaling to zoom out */
get_view(&decoder, &cx, &cy); get_view(&decoder, &cx, &cy);
cx /= 2; /* prepare the position in the new image */ cx /= zoom; /* prepare the position in the new image */
cy /= 2; cy /= zoom;
if (disp[ds] != converted_image || ds >= ds_max) break;
}
} }
else else
continue; continue;