/* stretch_blit_to_hdc:
* Blits an Allegro BITMAP to a Windows DC. Has a syntax similar to
* stretch_blit().
*/
static void local_stretch_blit_to_hdc(ALLEGRO_BITMAP *bitmap, HDC dc,
int src_x, int src_y, int src_w, int src_h,
int dest_x, int dest_y, int dest_w, int dest_h)
{
const int bitmap_h = al_get_bitmap_height(bitmap);
const int bottom_up_src_y = bitmap_h - src_y - src_h;
BYTE *pixels;
BITMAPINFO *bi;
bi = get_bitmap_info(bitmap);
pixels = get_dib_from_bitmap_32(bitmap);
/* Windows treats all source bitmaps as bottom-up when using StretchDIBits
* unless the source (x,y) is (0,0). To work around this buggy behavior, we
* can use negative heights to reverse the direction of the blits.
*
* See <http://wiki.allegro.cc/StretchDIBits> for a detailed explanation.
*/
if (bottom_up_src_y == 0 && src_x == 0 && src_h != bitmap_h) {
StretchDIBits(dc, dest_x, dest_h+dest_y-1, dest_w, -dest_h,
src_x, bitmap_h - src_y + 1, src_w, -src_h, pixels, bi,
DIB_RGB_COLORS, SRCCOPY);
}
else {
StretchDIBits(dc, dest_x, dest_y, dest_w, dest_h,
src_x, bottom_up_src_y, src_w, src_h, pixels, bi,
DIB_RGB_COLORS, SRCCOPY);
}
al_free(pixels);
al_free(bi);
}
// ------------ begin of function RockRes::get_bitmap_recno -----------//
// return rockBitmapRecno
short RockRes::get_bitmap_recno(short rockId, char curFrame)
{
RockInfo *rockInfo = get_rock_info(rockId);
short rockBitmapRecno = rockInfo->first_bitmap_recno+curFrame-1;
#ifdef DEBUG
// --------- validate curFrame with frame ----------//
RockBitmapInfo *rockBitmapInfo = get_bitmap_info(rockBitmapRecno);
err_when( rockBitmapInfo->frame != curFrame );
#endif
return rockBitmapRecno;
}
// ------------ begin of function RockRes::choose_next -----------//
// choose the next frame
// <short> rockId rock Id
// <char> curFrame the current frame no.
// <long> path a random number, related to the probability of choosing alt_next
// eg. choose_next(..,.., misc.random(x)); prob of using alt_next is 1/x
// return next frame no.
char RockRes::choose_next(short rockId, char curFrame, long path)
{
#ifdef DEBUG
// -------- validate rockRecno ---------//
RockInfo *rockInfo = get_rock_info(rockId);
// -------- validate curFrame ----------//
err_when(curFrame <= 0 || curFrame > rockInfo->max_frame);
#endif
RockBitmapInfo *rockBitmapInfo = get_bitmap_info(get_bitmap_recno(rockId, curFrame));
// -------- validate frame, next_frame and alt_next in rockBitmapInfo -------/
// err_when(get_anim_info(get_anim_recno(rockRecno, rockBitmapInfo->next_frame))->frame != rockBitmapInfo->next_frame);
// err_when(get_anim_info(get_anim_recno(rockRecno, rockBitmapInfo->alt_next))->frame != rockBitmapInfo->alt_next);
return rockBitmapInfo->choose_next(path);
}
// ------------ begin of function RockRes::draw -----------//
// draw the whole rock at location (xLoc, yLoc)
// <short> rockId rock Id
// <short> xLoc,yLoc,curZ where the rock is drawn
// <char> curFrame frame no.
void RockRes::draw(short rockId, short xLoc, short yLoc, short curZ, char curFrame)
{
RockInfo *rockInfo = get_rock_info(rockId);
get_bitmap_info(get_bitmap_recno(rockId, curFrame))->draw(rockInfo, xLoc, yLoc, curZ );
}
