Abstract platform rendering to "surfaces"

This will allow us to render more things than just the framebuffer.

1 files changed, 146 insertions, 0 deletions

diff --git a/vncviewer/Surface_Win32.cxx b/vncviewer/Surface_Win32.cxx
new file mode 100644
index 00000000..5a9a6546
--- /dev/null
+++ b/vncviewer/Surface_Win32.cxx
@@ -0,0 +1,146 @@
+/* Copyright 2016 Pierre Ossman for Cendio AB
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#include <assert.h>
+
+#include <FL/Fl_RGB_Image.H>
+#include <FL/x.H>
+
+#include <rdr/Exception.h>
+
+#include "Surface.h"
+
+void Surface::clear(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+  RGBQUAD* out;
+  int x, y;
+
+  r = (unsigned)r * a / 255;
+  g = (unsigned)g * a / 255;
+  b = (unsigned)b * a / 255;
+
+  out = data;
+  for (y = 0;y < width();y++) {
+    for (x = 0;x < height();x++) {
+      out->rgbRed = r;
+      out->rgbGreen = g;
+      out->rgbBlue = b;
+      out->rgbReserved = a;
+      out++;
+    }
+  }
+}
+
+void Surface::draw(int src_x, int src_y, int x, int y, int w, int h)
+{
+  HDC dc;
+
+  dc = CreateCompatibleDC(fl_gc);
+  if (!dc)
+    throw rdr::SystemException("CreateCompatibleDC", GetLastError());
+
+  if (!SelectObject(dc, bitmap))
+    throw rdr::SystemException("SelectObject", GetLastError());
+
+  if (!BitBlt(fl_gc, x, y, w, h, dc, src_x, src_y, SRCCOPY)) {
+    // If the desktop we're rendering to is inactive (like when the screen
+    // is locked or the UAC is active), then GDI calls will randomly fail.
+    // This is completely undocumented so we have no idea how best to deal
+    // with it. For now, we've only seen this error and for this function
+    // so only ignore this combination.
+    if (GetLastError() != ERROR_INVALID_HANDLE)
+      throw rdr::SystemException("BitBlt", GetLastError());
+  }
+
+  DeleteDC(dc);
+}
+
+void Surface::alloc()
+{
+  BITMAPINFOHEADER bih;
+
+  data = new RGBQUAD[width() * height()];
+
+  memset(&bih, 0, sizeof(bih));
+
+  bih.biSize         = sizeof(BITMAPINFOHEADER);
+  bih.biBitCount     = 32;
+  bih.biPlanes       = 1;
+  bih.biWidth        = width();
+  bih.biHeight       = -height(); // Negative to get top-down
+  bih.biCompression  = BI_RGB;
+
+  bitmap = CreateDIBSection(NULL, (BITMAPINFO*)&bih,
+                            DIB_RGB_COLORS, (void**)&data, NULL, 0);
+  if (!bitmap)
+    throw rdr::SystemException("CreateDIBSection", GetLastError());
+}
+
+void Surface::dealloc()
+{
+  DeleteObject(bitmap);
+}
+
+void Surface::update(const Fl_RGB_Image* image)
+{
+  const unsigned char* in;
+  RGBQUAD* out;
+  int x, y;
+
+  assert(image->w() == width());
+  assert(image->h() == height());
+
+  // Convert data and pre-multiply alpha
+  in = (const unsigned char*)image->data()[0];
+  out = data;
+  for (y = 0;y < image->w();y++) {
+    for (x = 0;x < image->h();x++) {
+      switch (image->d()) {
+      case 1:
+        out->rgbBlue = in[0];
+        out->rgbGreen = in[0];
+        out->rgbRed = in[0];
+        out->rgbReserved = 0xff;
+        break;
+      case 2:
+        out->rgbBlue = (unsigned)in[0] * in[1] / 255;
+        out->rgbGreen = (unsigned)in[0] * in[1] / 255;
+        out->rgbRed = (unsigned)in[0] * in[1] / 255;
+        out->rgbReserved = in[1];
+        break;
+      case 3:
+        out->rgbBlue = in[2];
+        out->rgbGreen = in[1];
+        out->rgbRed = in[0];
+        out->rgbReserved = 0xff;
+        break;
+      case 4:
+        out->rgbBlue = (unsigned)in[2] * in[3] / 255;
+        out->rgbGreen = (unsigned)in[1] * in[3] / 255;
+        out->rgbRed = (unsigned)in[0] * in[3] / 255;
+        out->rgbReserved = in[3];
+        break;
+      }
+      in += image->d();
+      out++;
+    }
+    if (image->ld() != 0)
+      in += image->ld() - image->w() * image->d();
+  }
+}
+