implement gdi text renderer

src/text/gdi.c

@@ -0,0 +1,148 @@
+#ifdef USE_GDI_TEXT
+#include <Mw/Milsko.h>
+
+struct _MwFLFont {
+	HANDLE handle;
+	HFONT  font;
+	HDC    dc;
+};
+
+static int GDI_MwDrawText(MwWidget handle, MwFLFont ttf, MwPoint* point, const char* text, MwLLColor color) {
+	BITMAPINFOHEADER bmih;
+	int		 tw;
+	int		 th;
+	HBITMAP		 hbm;
+	RGBQUAD*	 bits = NULL;
+	HDC		 hmdc;
+	char*		 t = MwUTF8ToACP(text);
+	unsigned char*	 px;
+	int		 y, x;
+	MwRect		 r;
+	MwLLPixmap	 p;
+
+	tw = MwTextWidth(handle, ttf, text);
+	th = MwTextHeight(handle, ttf, text);
+
+	px = malloc(tw * th * 4);
+
+	bmih.biSize	     = sizeof(bmih);
+	bmih.biWidth	     = tw;
+	bmih.biHeight	     = -(LONG)th;
+	bmih.biPlanes	     = 1;
+	bmih.biBitCount	     = 32;
+	bmih.biCompression   = BI_RGB;
+	bmih.biSizeImage     = 0;
+	bmih.biXPelsPerMeter = 0;
+	bmih.biYPelsPerMeter = 0;
+	bmih.biClrUsed	     = 0;
+	bmih.biClrImportant  = 0;
+
+	hbm = CreateDIBSection(ttf->dc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS, (void**)&bits, NULL, 0);
+
+	hmdc = CreateCompatibleDC(ttf->dc);
+	SelectObject(hmdc, hbm);
+	SelectObject(hmdc, ttf->font);
+
+	TextOut(hmdc, 0, 0, t, strlen(t));
+
+	DeleteDC(hmdc);
+
+	for(y = 0; y < th; y++) {
+		for(x = 0; x < tw; x++) {
+			unsigned char* opx = &px[(y * tw + x) * 4];
+
+			opx[0] = color->common.red;
+			opx[1] = color->common.green;
+			opx[2] = color->common.blue;
+			opx[3] = 255 - bits[y * tw + x].rgbRed;
+		}
+	}
+
+	p	 = MwLoadRaw(handle, px, tw, th);
+	r.x	 = point->x;
+	r.y	 = point->y - th / 2;
+	r.width	 = tw;
+	r.height = th;
+
+	MwLLDrawPixmap(handle->lowlevel, &r, p);
+	MwLLDestroyPixmap(p);
+	free(px);
+
+	DeleteObject(hbm);
+
+	free(t);
+
+	return 0;
+}
+
+static int GDI_MwTextWidth(MwFLFont ttf, const char* text) {
+	char* t = MwUTF8ToACP(text);
+	SIZE  sz;
+
+	GetTextExtentPoint32(ttf->dc, t, strlen(t), &sz);
+
+	free(t);
+
+	return sz.cx;
+}
+
+static int GDI_MwTextHeight(MwFLFont ttf, int count) {
+	TEXTMETRIC tm;
+
+	GetTextMetrics(ttf->dc, &tm);
+
+	return tm.tmHeight * count;
+}
+
+static void* GDI_MwFontLoad(unsigned char* data, unsigned int size, int px) {
+	MwFLFont  ttf = malloc(sizeof(*ttf));
+	DWORD	  c;
+	MwTTFInfo info;
+
+	if((info = MwTTFGetInfo(data, size)) == NULL) {
+		free(ttf);
+		return NULL;
+	}
+
+	ttf->dc = GetDC(NULL);
+
+	if((ttf->handle = AddFontMemResourceEx(data, size, 0, &c)) == NULL) {
+		ReleaseDC(NULL, ttf->dc);
+		MwTTFFreeInfo(info);
+		free(ttf);
+		return NULL;
+	}
+
+	if((ttf->font = CreateFont(-px, 0, 0, 0, info->weight, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, info->family)) == NULL) {
+		RemoveFontMemResourceEx(ttf->handle);
+		ReleaseDC(NULL, ttf->dc);
+		MwTTFFreeInfo(info);
+		free(ttf);
+		return NULL;
+	}
+
+	MwTTFFreeInfo(info);
+
+	SelectObject(ttf->dc, ttf->font);
+
+	return ttf;
+}
+
+static void GDI_MwFontFree(void* handle) {
+	MwFLFont ttf = handle;
+
+	DeleteObject(ttf->font);
+	RemoveFontMemResourceEx(ttf->handle);
+	ReleaseDC(NULL, ttf->dc);
+	free(ttf);
+}
+
+int MwFL_GDISetup(void) {
+	MwFLDrawText   = GDI_MwDrawText;
+	MwFLTextWidth  = GDI_MwTextWidth;
+	MwFLTextHeight = GDI_MwTextHeight;
+	MwFLFontLoad   = GDI_MwFontLoad;
+	MwFLFontFree   = GDI_MwFontFree;
+	return 0;
+}
+#endif