[Mesa-dev] [PATCH] wgl: Rudimentary wglUseFontBitmaps sample.

[Jose Fonseca]

It uses SYSTEM_FONT which actually creates some challenges when emulating
wglUseFontBitmaps:  in spite what https://msdn.microsoft.com/en-us/library/windows/desktop/dd374392.aspx
implies, GetGlyphOutline(GGO_BITMAP) does not seem to work with certain
fonts.  The only solution is to draw the font charactors with a HBITMAP
like the old Mesa fxwgl.c code used to do.  That too, seems to be the way
that opengl32.dll implements wglUseFontBitmaps.
---
 src/wgl/CMakeLists.txt |   2 +
 src/wgl/wglfont.c      | 103 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 src/wgl/wglfont.c

diff --git a/src/wgl/CMakeLists.txt b/src/wgl/CMakeLists.txt
index 0229ac7..cb50cca 100644
--- a/src/wgl/CMakeLists.txt
+++ b/src/wgl/CMakeLists.txt
@@ -16,6 +16,7 @@ set_target_properties (wgl_sharedtex_mt PROPERTIES OUTPUT_NAME sharedtex_mt)
 add_executable (wglinfo wglinfo.c ${CMAKE_SOURCE_DIR}/src/xdemos/glinfo_common.c)
 add_executable (wglcontext wglcontext.c)
 add_executable (wincopy WIN32 wincopy.c wglutil.c)
+add_executable (wglfont wglfont.c)
 
 install (
 	TARGETS
@@ -23,6 +24,7 @@ install (
 		wgl_sharedtex_mt
 		wglinfo
 		wglcontext
+		wglfont
 		wincopy
 	DESTINATION wgl)
 
diff --git a/src/wgl/wglfont.c b/src/wgl/wglfont.c
new file mode 100644
index 0000000..86c5f88
--- /dev/null
+++ b/src/wgl/wglfont.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2015, VMware, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <windows.h>
+#include <stdlib.h>
+#include <GL/gl.h>
+
+int
+main(int argc, char *argv[])
+{
+   WNDCLASS wc;
+   HWND hwnd;
+   HDC hdc;
+   PIXELFORMATDESCRIPTOR pfd;
+   int iPixelFormat;
+   HGLRC hglrc;
+
+   ZeroMemory(&wc, sizeof wc);
+   wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
+   wc.lpfnWndProc = DefWindowProc;
+   wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+   wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+   wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
+   wc.lpszClassName = "wglfont";
+
+   if (!RegisterClass(&wc)) {
+      abort();
+   }
+
+   hwnd = CreateWindowEx(0,
+                         wc.lpszClassName,
+                         "wglfont",
+                         WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_TILEDWINDOW,
+                         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
+                         NULL, NULL,
+                         wc.hInstance,
+                         NULL);
+   if (!hwnd) {
+      abort();
+   }
+
+   hdc = GetDC(hwnd);
+   if (!hdc) {
+      abort();
+   }
+
+   ZeroMemory(&pfd, sizeof pfd);
+   pfd.nSize = sizeof pfd;
+   pfd.nVersion = 1;
+   pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
+   pfd.iPixelType = PFD_TYPE_RGBA;
+   pfd.cColorBits = 24;
+   pfd.cDepthBits = 24;
+   pfd.iLayerType = PFD_MAIN_PLANE;
+
+   iPixelFormat = ChoosePixelFormat(hdc, &pfd);
+   if (!iPixelFormat) {
+      abort();
+   }
+
+   if (!SetPixelFormat(hdc, iPixelFormat, &pfd)) {
+      abort();
+   }
+
+   hglrc = wglCreateContext(hdc);
+   if (!hglrc) {
+      abort();
+   }
+
+   wglMakeCurrent(hdc, hglrc);
+
+   SelectObject(hdc, GetStockObject(SYSTEM_FONT));
+
+   wglUseFontBitmaps(hdc, 0, 255, 1000);
+
+   glListBase(1000);
+
+   glCallLists(12, GL_UNSIGNED_BYTE, "Hello World!");
+
+   SwapBuffers(hdc);
+
+   Sleep(1000);
+
+   return 0;
+}
-- 
2.5.0