Hi, everybody
I have found a strange problem with directfb's DrawString() function. In
order to describe this problem clearly, I copied my test source code below.
When I do the test with those code --- "surface1->SetColor(surface1, 0xff,
0xff, 0xff, 0xff); // blinking !", then I got the lcd screen blinking all the
time; but when I do the test with those code ---"surface1->SetColor(surface1,
0xff, 0x00, 0x00, 0xff); // ok, no blinking.", then no blinking at all.
It seems that the color setting affect the blinking thing, and I also
changed the color to RED, BLUE, GREEN, YELLOW... The conclusion is if NOT
WHITE(0xff,0xff,0xff), then OK, no blinking, just WHITE makes blinking!
Does anyone find the same problem?
BTW: My test environment is DirectFB-1.1.1, freetype-2.3.5, and if need more
information please let me know, thanks advance!
test source code:
#include <directfb.h>
#include <stdio.h>
static IDirectFB *dfb = NULL;
static IDirectFBDisplayLayer *layer = NULL;
static IDirectFBWindow *window1 = NULL;
static IDirectFBSurface *surface1 = NULL;
static IDirectFBFont *font = NULL;
int main(int argc, char **argv)
{
DFBDisplayLayerConfig layer_config;
DFBWindowDescription window_desc;
DFBSurfaceDescription dsc;
int err;
DFBFontDescription desc;
DirectFBInit(&argc, &argv);
DirectFBCreate(&dfb);
dfb->GetDisplayLayer(dfb, DLID_PRIMARY, &layer);
layer->SetCooperativeLevel( layer, DLSCL_ADMINISTRATIVE );
//layer->SetCooperativeLevel( layer, DLSCL_EXCLUSIVE );
layer_config.flags = DLCONF_WIDTH | DLCONF_HEIGHT;
layer_config.width = 800;
layer_config.height = 600;
err = layer->SetConfiguration(layer, &layer_config);
printf("err=%d\n", err);
window_desc.flags = DWDESC_WIDTH | DWDESC_HEIGHT | DWDESC_POSX |
DWDESC_POSY;
window_desc.posx = 0;
window_desc.posy = 0;
window_desc.width = layer_config.width;
window_desc.height = layer_config.height;
layer->CreateWindow(layer, &window_desc, &window1);
window1->SetOpacity(window1, 0xFF);
window1->GetSurface(window1, &surface1);
surface1->SetColor(surface1, 0xff, 0xff, 0xff, 0xff); // blinking !
//surface1->SetColor(surface1, 0xff, 0x00, 0x00, 0xff); // ok, no blinking.
desc.flags = DFDESC_HEIGHT;
desc.height = 14;
dfb->CreateFont(dfb, "/mnt/jffs2/decker.ttf", &desc, &font); // maybe you
need to change the font directory to yourself!
surface1->SetFont(surface1, font);
surface1->SetDrawingFlags(surface1, DSDRAW_NOFX);
surface1->DrawString(surface1, "NIBP", -1, 600, 100, DSTF_TOPLEFT);
surface1->DrawString(surface1, "mmHg", -1, 700, 100, DSTF_TOPLEFT);
surface1->Flip(surface1, NULL, 0);
printf("after DrawString at window1...\n");
while(!getchar());
font->Release(font);
layer->Release(layer);
window1->Release(window1);
surface1->Release(surface1);
dfb->Release(dfb);
return 0;
}
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