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jpeg/png: refactor use of buf.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23655 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Teruaki Kawashima 2009-11-17 15:15:29 +00:00
parent d66b9be85d
commit d1a3060ddd
2 changed files with 32 additions and 46 deletions
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48
apps/plugins/jpeg/jpeg.c
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@ -158,16 +158,18 @@ static struct t_disp disp[9];
/* my memory pool (from the mp3 buffer) */
static char print[32]; /* use a common snprintf() buffer */
static unsigned char* buf; /* up to here currently used by image(s) */
/* the remaining free part of the buffer for compressed+uncompressed images */
static unsigned char* buf_images;
static unsigned char* buf;
static ssize_t buf_size;
static ssize_t buf_size, buf_images_size;
/* the root of the images, hereafter are decompresed ones */
static unsigned char* buf_root;
static int root_size;
/* up to here currently used by image(s) */
static unsigned char* buf_images;
static ssize_t buf_images_size;
static int ds, ds_min, ds_max; /* downscaling and limits */
static struct jpeg jpg; /* too large for stack */
@ -760,13 +762,13 @@ struct t_disp* get_image(struct jpeg* p_jpg, int ds)
/* physical size needed for decoding */
size = jpegmem(p_jpg, ds);
if (buf_size <= size)
if (buf_images_size <= size)
{ /* have to discard the current */
int i;
for (i=1; i<=8; i++)
disp[i].bitmap[0] = NULL; /* invalidate all bitmaps */
buf = buf_root; /* start again from the beginning of the buffer */
buf_size = root_size;
buf_images = buf_root; /* start again from the beginning of the buffer */
buf_images_size = root_size;
}
#ifdef HAVE_LCD_COLOR
@ -778,9 +780,9 @@ struct t_disp* get_image(struct jpeg* p_jpg, int ds)
{
size = (p_jpg->x_phys / ds / p_jpg->subsample_x[i])
* (p_jpg->y_phys / ds / p_jpg->subsample_y[i]);
p_disp->bitmap[i] = buf;
buf += size;
buf_size -= size;
p_disp->bitmap[i] = buf_images;
buf_images += size;
buf_images_size -= size;
}
p_disp->csub_x = p_jpg->subsample_x[1];
p_disp->csub_y = p_jpg->subsample_y[1];
@ -788,14 +790,14 @@ struct t_disp* get_image(struct jpeg* p_jpg, int ds)
else
{
p_disp->csub_x = p_disp->csub_y = 0;
p_disp->bitmap[1] = p_disp->bitmap[2] = buf;
p_disp->bitmap[1] = p_disp->bitmap[2] = buf_images;
}
#endif
/* size may be less when decoded (if height is not block aligned) */
size = (p_jpg->x_phys/ds) * (p_jpg->y_size / ds);
p_disp->bitmap[0] = buf;
buf += size;
buf_size -= size;
p_disp->bitmap[0] = buf_images;
buf_images += size;
buf_images_size -= size;
if(!running_slideshow)
{
@ -889,15 +891,14 @@ int load_and_show(char* filename)
filesize = rb->filesize(fd);
rb->memset(&disp, 0, sizeof(disp));
buf = buf_images + filesize;
buf_size = buf_images_size - filesize;
/* allocate JPEG buffer */
buf_jpeg = buf_images;
buf_jpeg = buf;
buf_root = buf; /* we can start the decompressed images behind it */
root_size = buf_size;
/* we can start the decompressed images behind it */
buf_images = buf_root = buf + filesize;
buf_images_size = root_size = buf_size - filesize;
if (buf_size <= 0)
if (buf_images_size <= 0)
{
rb->close(fd);
#if PLUGIN_BUFFER_SIZE >= MIN_MEM
@ -924,8 +925,7 @@ int load_and_show(char* filename)
{
case JPEG_ZOOM_IN:
plug_buf = false;
buf_images = rb->plugin_get_audio_buffer(
(size_t *)&buf_images_size);
buf = rb->plugin_get_audio_buffer((size_t *)&buf_size);
/*try again this file, now using the audio buffer */
return PLUGIN_OTHER;
#ifdef JPEG_RC_MENU
@ -1022,7 +1022,7 @@ int load_and_show(char* filename)
rb->lcd_update();
}
ds_max = max_downscale(&jpg); /* check display constraint */
ds_min = min_downscale(&jpg, buf_size); /* check memory constraint */
ds_min = min_downscale(&jpg, buf_images_size); /* check memory constraint */
if (ds_min == 0)
{
rb->splash(HZ, "too large");
@ -1155,8 +1155,6 @@ enum plugin_status plugin_start(const void* parameter)
ARRAYLEN(jpeg_config), JPEG_SETTINGS_MINVERSION);
old_settings = jpeg_settings;
buf_images = buf; buf_images_size = buf_size;
/* Turn off backlight timeout */
backlight_force_on(); /* backlight control in lib/helper.c */