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Test_Viewports BUGFIX 

putting a framebuffer on the stack is never a good idea

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Change-Id: I5553050785b74cb847db03957c6377cab11e816c
This commit is contained in:
William Wilgus 2020-10-31 00:22:11 -04:00
parent 7eee526e6a
commit 202f9df0c1
1 changed files with 33 additions and 4 deletions
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37
apps/plugins/test_viewports.c
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@ -122,13 +122,20 @@ static struct viewport rvp1 =
static void *test_address_fn(int x, int y)
{
struct frame_buffer_t *fb = vp0.buffer;
/* Address lookup function
* core will use this to get an address from x/y coord
* depending on the lcd function core sometimes uses this for
* only the first and last address
* and handles subsequent address based on stride */
struct frame_buffer_t *fb = vp0.buffer;
/* LCD_STRIDEFORMAT & LCD_NATIVE_STRIDE macros allow Horiz screens to work with RB */
#if defined(LCD_STRIDEFORMAT) && LCD_STRIDEFORMAT == VERTICAL_STRIDE
size_t element = (x * LCD_NATIVE_STRIDE(fb->stride)) + y;
#else
size_t element = (y * LCD_NATIVE_STRIDE(fb->stride)) + x;
#endif
/* use mod fb->elems to protect from buffer ovfl */
return fb->fb_ptr + (element % fb->elems);
}
@ -137,17 +144,39 @@ enum plugin_status plugin_start(const void* parameter)
(void)parameter;
char buf[80];
int i,y;
fb_data vp_buffer[LCD_NBELEMS(vp0.width, vp0.height)];
size_t plugin_buf_len;
void* plugin_buf = (unsigned char *)rb->plugin_get_buffer(&plugin_buf_len);
/* Here we will test if viewports of non standard size work with the rb core */
struct frame_buffer_t fb;
rb->font_getstringsize("W", NULL, &vp0.height, vp0.font);
fb.elems = LCD_NBELEMS(vp0.width, vp0.height);
/* set stride based on the with or height of our buffer (macro picks the proper one) */
fb.stride = STRIDE_MAIN(vp0.width, vp0.height);
fb.fb_ptr = vp_buffer;
fb.elems = LCD_NBELEMS(vp0.width, vp0.height);
/*set the framebuffer pointer to our buffer (union - pick appropriate data type) */
fb.data = plugin_buf;
/* Valid data types for fb union
void* - data
char* - ch_ptr,
fb_data* - fb_ptr,
fb_remote_data - fb_remote_ptr;
*/
if (fb.elems * sizeof(fb_data) > plugin_buf_len)
return PLUGIN_ERROR;
plugin_buf += fb.elems * sizeof(fb_data);
plugin_buf_len -= fb.elems * sizeof(fb_data); /* buffer bookkeeping */
/* set a frame buffer address lookup function */
fb.get_address_fn = &test_address_fn;
/* set our newly built buffer to the viewport */
rb->viewport_set_buffer(&vp0, &fb, SCREEN_MAIN);
rb->screens[SCREEN_MAIN]->set_viewport(&vp0);
rb->screens[SCREEN_MAIN]->clear_viewport();