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New front end functions to save and restore a region of the puzzle

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bitmap. Can be used to implement sprite-like animations: for
example, useful for games that wish to implement a user interface
which involves dragging an object around the playing area.

[originally from svn r5987]
This commit is contained in:
Simon Tatham
2005-06-22 08:30:31 +00:00
parent 64fbdf60ee
commit b176767dfa
4 changed files with 186 additions and 0 deletions
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82
windows.c
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@ -90,6 +90,12 @@ struct cfg_aux {
int ctlid;
};
struct blitter {
HBITMAP bitmap;
frontend *fe;
int x, y, w, h;
};
struct frontend {
midend_data *me;
HWND hwnd, statusbar, cfgbox;
@ -149,6 +155,82 @@ void status_bar(frontend *fe, char *text)
}
}
blitter *blitter_new(int w, int h)
{
blitter *bl = snew(blitter);
memset(bl, 0, sizeof(blitter));
bl->w = w;
bl->h = h;
bl->bitmap = 0;
return bl;
}
void blitter_free(blitter *bl)
{
if (bl->bitmap) DeleteObject(bl->bitmap);
sfree(bl);
}
static void blitter_mkbitmap(frontend *fe, blitter *bl)
{
HDC hdc = GetDC(fe->hwnd);
bl->bitmap = CreateCompatibleBitmap(hdc, bl->w, bl->h);
ReleaseDC(fe->hwnd, hdc);
}
/* BitBlt(dstDC, dstX, dstY, dstW, dstH, srcDC, srcX, srcY, dType) */
void blitter_save(frontend *fe, blitter *bl, int x, int y)
{
HDC hdc_win, hdc_blit;
HBITMAP prev_blit;
if (!bl->bitmap) blitter_mkbitmap(fe, bl);
bl->x = x; bl->y = y;
hdc_win = GetDC(fe->hwnd);
hdc_blit = CreateCompatibleDC(hdc_win);
if (!hdc_blit) fatal("hdc_blit failed: 0x%x", GetLastError());
prev_blit = SelectObject(hdc_blit, bl->bitmap);
if (prev_blit == NULL || prev_blit == HGDI_ERROR)
fatal("SelectObject for hdc_main failed: 0x%x", GetLastError());
if (!BitBlt(hdc_blit, 0, 0, bl->w, bl->h,
fe->hdc_bm, x, y, SRCCOPY))
fatal("BitBlt failed: 0x%x", GetLastError());
SelectObject(hdc_blit, prev_blit);
DeleteDC(hdc_blit);
ReleaseDC(fe->hwnd, hdc_win);
}
void blitter_load(frontend *fe, blitter *bl, int x, int y)
{
HDC hdc_win, hdc_blit;
HBITMAP prev_blit;
assert(bl->bitmap); /* we should always have saved before loading */
if (x == BLITTER_FROMSAVED) x = bl->x;
if (y == BLITTER_FROMSAVED) y = bl->y;
hdc_win = GetDC(fe->hwnd);
hdc_blit = CreateCompatibleDC(hdc_win);
prev_blit = SelectObject(hdc_blit, bl->bitmap);
BitBlt(fe->hdc_bm, x, y, bl->w, bl->h,
hdc_blit, 0, 0, SRCCOPY);
SelectObject(hdc_blit, prev_blit);
DeleteDC(hdc_blit);
ReleaseDC(fe->hwnd, hdc_win);
}
void frontend_default_colour(frontend *fe, float *output)
{
DWORD c = GetSysColor(COLOR_MENU); /* ick */