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Add hidpi test

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Test hi-dpi "retina" display, where there are four times as many pixels as the window's (height x width) would have you believe.

On hi-res displays, the "HighRes" window will have one-pixel-wide vertical black bars within the red-to-purple gradient, while in the "LowRes" window they'll be two-pixel-wide. On regular displays, LowRes will have the one-pixel bars, and HiRes should be a down-sampled gradient with no bars.
This commit is contained in:
drfuchs 2020-09-20 09:40:03 -07:00
parent 4c898b0b8b
commit 5691ca1441
2 changed files with 52 additions and 0 deletions
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4
CMakeLists.txt
View File

@ -276,6 +276,10 @@ if(MINIFB_BUILD_EXAMPLES)
tests/multiple_windows.c tests/multiple_windows.c
) )
add_executable(hidpi
tests/hidpi.c
)
else() else()
add_executable(noise add_executable(noise

48
tests/hidpi.c Normal file
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@ -0,0 +1,48 @@
#include <MiniFB.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#define DIMEN_LOW 512
static unsigned int g_buffer_low[DIMEN_LOW * DIMEN_LOW];
#define DIMEN_HIGH (2*DIMEN_LOW)
static unsigned int g_buffer_high[DIMEN_HIGH * DIMEN_HIGH];
void
pretty_square(unsigned int *p, int dimen)
{
memset(p, 127, dimen*dimen*4);
const int one_half_dimen = dimen / 2;
const int one_quarter_dimen = one_half_dimen / 2;
const int three_quarter_dimen = one_half_dimen + one_quarter_dimen;
for (int x = one_quarter_dimen; x < three_quarter_dimen; x++)
for (int y = one_quarter_dimen; y < three_quarter_dimen; y++)
p[y*dimen + x] = (x & 1) ? MFB_RGB(223,0,(255*(x-one_quarter_dimen))/one_half_dimen) : MFB_RGB(0,0,0);
}
int
main()
{
pretty_square(g_buffer_low, DIMEN_LOW);
pretty_square(g_buffer_high, DIMEN_HIGH);
struct mfb_window *window_low = mfb_open("LowRes", DIMEN_LOW, DIMEN_LOW);
struct mfb_window *window_high = mfb_open("HighRes", DIMEN_HIGH/2, DIMEN_HIGH/2);
while (window_high || window_low)
{
if (window_low)
if (mfb_update_ex(window_low, g_buffer_low, DIMEN_LOW, DIMEN_LOW) != STATE_OK
|| !mfb_wait_sync(window_low))
window_low = NULL;
if (window_high)
if (mfb_update_ex(window_high, g_buffer_high, DIMEN_HIGH, DIMEN_HIGH) != STATE_OK
|| !mfb_wait_sync(window_high))
window_high = NULL;
}
return 0;
}