Hi, as I wrote in a question in users list I have some problems blitting an image using color keys when using SDL as backend.
I have investigated this further by minimizing the code so that I have a program only doing this failing blit. This program is attached as "blit.c". When compiling the attached program against DirectFB 1.1.1 I have no problems using color key for blitting. It works with both DSPF_RGB32 and DSPF_ARGB. When compiling against DirectFB 1.2.3 the color key does not work when using DSPF_RGB32. It still works when using DSPF_ARGB. Any ideas? Thanks, Anders Karlsson <[EMAIL PROTECTED]>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <directfb.h>
#define WIDTH 640
#define HEIGHT 480
#define PIXEL_FORMAT DSPF_ARGB
#define DFBCHECK(x...) \
{ DFBResult err = x; \
if (err != DFB_OK) { \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); } }
// Bitmap containing the mouse pointer face.
#define ARROW_WIDTH 12
#define ARROW_HEIGHT 21
static unsigned char arrow_bits[] = {
0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00, 0x7f, 0x00,
0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0xff, 0x0f, 0xff, 0x00, 0xff, 0x00,
0xe7, 0x01, 0xe3, 0x01, 0xc1, 0x03, 0xc0, 0x03, 0x80, 0x07, 0x80, 0x07, 0x00, 0x03 };
int main(int argc, char **argv)
{
IDirectFB *dfb = NULL;
IDirectFBSurface *surface = NULL;
DFBSurfaceDescription dsc;
IDirectFBSurface *arrow = NULL;
DFBSurfaceDescription arrow_dsc;
DFBSurfacePixelFormat pixel_format = DSPF_UNKNOWN;
int bpp = 0;
DFBCHECK(DirectFBInit(&argc, &argv));
DFBCHECK(DirectFBCreate(&dfb));
DFBCHECK(dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
// Window surface
dsc.flags = (DFBSurfaceDescriptionFlags)(DSDESC_CAPS | DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT);
dsc.caps = (DFBSurfaceCapabilities)(DSCAPS_PRIMARY | DSCAPS_FLIPPING);
dsc.height = HEIGHT;
dsc.width = WIDTH;
dsc.pixelformat = PIXEL_FORMAT;
DFBCHECK(dfb->CreateSurface(dfb, &dsc, &surface));
DFBCHECK(surface->SetBlittingFlags(surface, DSBLIT_SRC_COLORKEY));
DFBCHECK(surface->SetColor(surface, 0x80, 0x00, 0xff, 0x00));
DFBCHECK(surface->FillRectangle(surface, 0, 0, WIDTH, HEIGHT));
DFBCHECK(surface->GetPixelFormat(surface, &pixel_format));
bpp = DFB_BITS_PER_PIXEL(pixel_format) / 8;
// Arrow surface
arrow_dsc.flags = (DFBSurfaceDescriptionFlags)(DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT);
arrow_dsc.height = ARROW_HEIGHT;
arrow_dsc.width = ARROW_WIDTH;
arrow_dsc.pixelformat = PIXEL_FORMAT;
DFBCHECK(dfb->CreateSurface(dfb, &arrow_dsc, &arrow));
// Set which color that will be transparent when the pointer surface is blitted onto other surfaces.
DFBCHECK(arrow->SetSrcColorKey(arrow, 0xff, 0x00, 0x00));
// Fill the surface with transparent pixels.
DFBCHECK(arrow->SetColor(arrow, 0xff, 0x00, 0x00, 0xff));
DFBCHECK(arrow->FillRectangle(arrow, 0, 0, ARROW_WIDTH, ARROW_HEIGHT));
// Create arrow
char white_pixel[] = {0xff, 0xff, 0xff, 0xff};
char *arrow_data = NULL;
int pitch = 0;
DFBCHECK(arrow->Lock(arrow, DSLF_WRITE, (void**)&arrow_data, &pitch));
for (int px = 0; px < arrow_dsc.width; ++px) {
for (int py = 0; py < arrow_dsc.height; ++py) {
int row_bytes = arrow_dsc.width/8 + ((arrow_dsc.width%8 > 0) ? 1 : 0);
if ((arrow_bits[py*row_bytes + px/8] >> px%8) & 0x01) {
memcpy(arrow_data + py*pitch + px*bpp, &white_pixel, bpp);
}
}
}
DFBCHECK(arrow->Unlock(arrow));
// Blit the mouse pointer
DFBRectangle pointer_rect = {0, 0, ARROW_WIDTH, ARROW_HEIGHT};
DFBCHECK(surface->Blit(surface, arrow, &pointer_rect, 100, 100));
DFBCHECK(surface->Flip(surface, 0, DSFLIP_BLIT));
sleep(10);
/* Release the super interface. */
arrow->Release( arrow );
surface->Release( surface );
dfb->Release( dfb );
return 0;
}
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