1 files changed, 156 insertions, 0 deletions
diff --git a/src/x11/cdxdbuf.c b/src/x11/cdxdbuf.c
new file mode 100644
index 0000000..1c92da5
--- /dev/null
+++ b/src/x11/cdxdbuf.c
@@ -0,0 +1,156 @@
+/** \file
+ * \brief X-Windows Double Buffer Driver
+ *
+ * See Copyright Notice in cd.h
+ */
+
+#include "cdx11.h"
+#include "cddbuf.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+
+static void cdkillcanvas (cdCtxCanvas* ctxcanvas)
+{
+  cdKillImage(ctxcanvas->image_dbuffer);
+  cdxKillCanvas(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)
+{
+  int old_writemode;
+  cdImage* image_dbuffer = ctxcanvas->image_dbuffer;
+  cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
+
+  /* flush the writing in the image */
+  XFlush(ctxcanvas->dpy);
+
+  /* this is done in the canvas_dbuffer context */
+  /* Flush can be affected by Origin and Clipping, but not WriteMode */
+  old_writemode = cdCanvasWriteMode(canvas_dbuffer, CD_REPLACE);
+  cdCanvasPutImageRect(canvas_dbuffer, image_dbuffer, 0, 0, 0, 0, 0, 0);
+  cdCanvasWriteMode(canvas_dbuffer, old_writemode);
+}
+
+static void cdcreatecanvas(cdCanvas* canvas, cdCanvas* canvas_dbuffer)
+{
+  cdCtxCanvas* ctxcanvas;
+  cdImage* image_dbuffer;
+  cdCtxImage* ctximage;
+
+  /* this is done in the canvas_dbuffer context */
+  image_dbuffer = cdCanvasCreateImage(canvas_dbuffer, canvas_dbuffer->w, canvas_dbuffer->h);
+  if (!image_dbuffer) 
+    return;
+
+  ctximage = image_dbuffer->ctximage;
+
+  /* Inicializa driver DBuffer */
+  ctxcanvas = cdxCreateCanvas(canvas, ctximage->dpy, ctximage->scr, ctximage->img, ctximage->vis);
+  if (!ctxcanvas)
+    return;
+
+  ctxcanvas->image_dbuffer = image_dbuffer;
+  ctxcanvas->canvas_dbuffer = canvas_dbuffer;
+}
+
+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->image_dbuffer->w ||
+      canvas_dbuffer->h != ctxcanvas->image_dbuffer->h)
+  {
+    cdCanvas* canvas = ctxcanvas->canvas;
+    /* save the current, if the rebuild fail */
+    cdImage* old_image_dbuffer = ctxcanvas->image_dbuffer;
+    cdCtxCanvas* old_ctxcanvas = ctxcanvas;
+
+    /* if the image is rebuild, the canvas that uses the image must be also rebuild */
+
+    /* rebuild the image and the canvas */
+    canvas->ctxcanvas = NULL;
+    canvas->context->cxCreateCanvas(canvas, canvas_dbuffer);
+    if (!canvas->ctxcanvas)
+    {
+      canvas->ctxcanvas = old_ctxcanvas;
+      return CD_ERROR;
+    }
+
+    /* remove the old image and canvas */
+    cdKillImage(old_image_dbuffer);
+    cdxKillCanvas(old_ctxcanvas);
+
+    ctxcanvas = canvas->ctxcanvas;
+
+    /* update canvas attributes */
+    canvas->cxBackground(ctxcanvas, canvas->background);
+    canvas->cxForeground(ctxcanvas, canvas->foreground);
+    canvas->cxBackOpacity(ctxcanvas, canvas->back_opacity);
+    canvas->cxWriteMode(ctxcanvas, canvas->write_mode);
+    canvas->cxLineStyle(ctxcanvas, canvas->line_style);
+    canvas->cxLineWidth(ctxcanvas, canvas->line_width);
+    canvas->cxLineCap(ctxcanvas, canvas->line_cap);
+    canvas->cxLineJoin(ctxcanvas, canvas->line_join);
+    canvas->cxHatch(ctxcanvas, canvas->hatch_style);
+    if (canvas->stipple) canvas->cxStipple(ctxcanvas, canvas->stipple_w, canvas->stipple_h, canvas->stipple);
+    if (canvas->pattern) canvas->cxPattern(ctxcanvas, canvas->pattern_w, canvas->pattern_h, canvas->pattern);
+    canvas->cxInteriorStyle(ctxcanvas, canvas->interior_style);
+    if (canvas->native_font[0] == 0) canvas->cxFont(ctxcanvas, canvas->font_type_face, canvas->font_style, canvas->font_size);
+    else canvas->cxNativeFont(ctxcanvas, canvas->native_font);
+/*    canvas->cxTextAlignment(ctxcanvas, canvas->text_alignment);     */
+/*    canvas->cxTextOrientation(ctxcanvas, canvas->text_orientation); */
+    if (canvas->clip_mode == CD_CLIPAREA && canvas->cxClipArea) canvas->cxClipArea(ctxcanvas, canvas->clip_rect.xmin, canvas->clip_rect.xmax, canvas->clip_rect.ymin, canvas->clip_rect.ymax);
+/*    if (canvas->clip_mode == CD_CLIPAREA && canvas->cxFClipArea) canvas->cxFClipArea(ctxcanvas, canvas->clip_frect.xmin, canvas->clip_frect.xmax, canvas->clip_frect.ymin, canvas->clip_frect.ymax); */
+    if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_poly) canvas->cxPoly(ctxcanvas, CD_CLIP, canvas->clip_poly, canvas->clip_poly_n);
+/*    if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_fpoly) canvas->cxFPoly(ctxcanvas, CD_CLIP, canvas->clip_fpoly, canvas->clip_poly_n); */
+    if (canvas->clip_mode != CD_CLIPOFF) canvas->cxClip(ctxcanvas, canvas->clip_mode);
+  }
+
+  return CD_OK;
+}
+
+static void cdinittable(cdCanvas* canvas)
+{
+  cdxInitTable(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 ),
+  0,
+  cdcreatecanvas,  
+  cdinittable,
+  NULL,             
+  NULL, 
+};
+
+cdContext* cdContextDBuffer(void)
+{
+  if (cdUseContextPlus(CD_QUERY))
+  {
+    cdContext* ctx = cdGetContextPlus(CD_CTX_DBUFFER);
+    if (ctx != NULL)
+      return ctx;
+  }
+
+  return &cdDBufferContext;
+}