1 files changed, 152 insertions, 0 deletions
diff --git a/src/gdiplus/cdwdbufp.cpp b/src/gdiplus/cdwdbufp.cpp
new file mode 100644
index 0000000..6d968b2
--- /dev/null
+++ b/src/gdiplus/cdwdbufp.cpp
@@ -0,0 +1,152 @@
+/** \file
+ * \brief Windows GDI+ Double Buffer
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include "cdwinp.h"
+#include "cddbuf.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+
+static void cdkillcanvas(cdCtxCanvas* ctxcanvas)
+{
+  cdwpKillCanvas(ctxcanvas);
+  
+  if (ctxcanvas->bitmap_dbuffer) delete ctxcanvas->bitmap_dbuffer;
+  delete ctxcanvas->bitmap;
+ 
+  delete ctxcanvas;
+}
+
+static void cddeactivate(cdCtxCanvas* ctxcanvas)
+{
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+  /* this is done in the canvas_dbuffer context */
+  cdCanvasDeactivate(canvas_dbuffer);
+}
+
+static void cdflush(cdCtxCanvas* ctxcanvas)
+{
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+  
+  if (ctxcanvas->dirty || ctxcanvas->bitmap_dbuffer == NULL)
+  {
+    ctxcanvas->dirty = 0;
+    if (ctxcanvas->bitmap_dbuffer) delete ctxcanvas->bitmap_dbuffer;
+    ctxcanvas->bitmap_dbuffer = new CachedBitmap(ctxcanvas->bitmap, canvas_dbuffer->ctxcanvas->graphics);
+  }
+
+  ctxcanvas->graphics->Flush(FlushIntentionSync);
+
+  /* this is done in the canvas_dbuffer context */
+  /* Flush can be affected by Origin and Clipping, but not WriteMode */
+  canvas_dbuffer->ctxcanvas->graphics->ResetTransform();
+
+  int x = 0, y = 0;
+  if (canvas_dbuffer->use_origin)
+  {
+    x += canvas_dbuffer->origin.x;
+    if (canvas_dbuffer->invert_yaxis)
+      y -= canvas_dbuffer->origin.y; // top down shift
+    else
+      y += canvas_dbuffer->origin.y;
+  }
+
+  int old_writemode = cdCanvasWriteMode(canvas_dbuffer, CD_REPLACE);
+  canvas_dbuffer->ctxcanvas->graphics->DrawCachedBitmap(ctxcanvas->bitmap_dbuffer, x, y);
+  canvas_dbuffer->ctxcanvas->graphics->Flush(FlushIntentionSync);
+  cdCanvasWriteMode(canvas_dbuffer, old_writemode);
+}
+
+static int cdactivate(cdCtxCanvas* ctxcanvas)
+{
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+
+  /* this is done in the canvas_dbuffer context */
+  /* this will update canvas size */
+  cdCanvasActivate(canvas_dbuffer);
+
+  /* check if the size changed */
+  if (canvas_dbuffer->w != ctxcanvas->canvas->w ||
+      canvas_dbuffer->h != ctxcanvas->canvas->h)
+  {
+    delete ctxcanvas->graphics;
+    delete ctxcanvas->bitmap;
+    if (ctxcanvas->bitmap_dbuffer) delete ctxcanvas->bitmap_dbuffer;
+    ctxcanvas->bitmap_dbuffer = NULL;
+
+    Bitmap* bitmap = new Bitmap(canvas_dbuffer->w, canvas_dbuffer->h, PixelFormat24bppRGB);
+    bitmap->SetResolution((REAL)(canvas_dbuffer->xres*25.4), (REAL)(canvas_dbuffer->yres*25.4));
+
+    ctxcanvas->bitmap = bitmap;
+    ctxcanvas->graphics = new Graphics(bitmap);
+
+    ctxcanvas->canvas->w = canvas_dbuffer->w;
+    ctxcanvas->canvas->h = canvas_dbuffer->h;
+
+    ctxcanvas->dirty = 1;
+
+    cdwpUpdateCanvas(ctxcanvas);
+  }
+
+  return CD_OK;
+}
+
+/*
+%F cdCreateCanvas para DBuffer.
+O DC é um BITMAP em memoria.
+*/
+static void cdcreatecanvas(cdCanvas* canvas, void *data)
+{
+  cdCanvas* canvas_dbuffer = (cdCanvas*)data;
+  if (!canvas_dbuffer)
+    return;
+
+  Bitmap* bitmap = new Bitmap(canvas_dbuffer->w, canvas_dbuffer->h, PixelFormat24bppRGB);
+  bitmap->SetResolution((REAL)(canvas_dbuffer->xres*25.4), (REAL)(canvas_dbuffer->yres*25.4));
+
+  Graphics imggraphics(bitmap);
+  imggraphics.Clear(Color::White);
+
+  Graphics* graphics = new Graphics(bitmap);
+
+  canvas->w = canvas_dbuffer->w;
+  canvas->h = canvas_dbuffer->h;
+  canvas->bpp = 24;
+
+  /* Initialize base driver */
+  cdCtxCanvas* ctxcanvas = cdwpCreateCanvas(canvas, graphics, CDW_BMP);
+
+  ctxcanvas->bitmap = bitmap;
+  ctxcanvas->canvas_dbuffer = canvas_dbuffer;
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdwpInitTable(canvas);
+
+  canvas->cxActivate = cdactivate;
+  canvas->cxDeactivate = cddeactivate;
+  canvas->cxFlush = cdflush;
+  canvas->cxKillCanvas = cdkillcanvas;
+}
+
+static cdContext cdDBufferContext =
+{
+  CD_CAP_ALL & ~(CD_CAP_PLAY | CD_CAP_YAXIS | 
+                  CD_CAP_FPRIMTIVES),
+  1,
+  cdcreatecanvas,  
+  cdinittable,
+  NULL,             
+  NULL, 
+};
+
+extern "C" {
+cdContext* cdContextDBufferPlus(void)
+{
+  return &cdDBufferContext;
+}
+}