GUAC-236: Implement cfill and rect.

src/guacenc/display.c

@@ -25,6 +25,7 @@
 #include "log.h"
 
 #include <guacamole/client.h>
+#include <guacamole/protocol.h>
 #include <guacamole/timestamp.h>
 
 #include <stdlib.h>
@@ -169,6 +170,63 @@ guacenc_buffer* guacenc_display_get_related_buffer(guacenc_display* display,
 
 }
 
+cairo_operator_t guacenc_display_cairo_operator(guac_composite_mode mask) {
+
+    /* Translate Guacamole channel mask into Cairo operator */
+    switch (mask) {
+
+        /* Source */
+        case GUAC_COMP_SRC:
+            return CAIRO_OPERATOR_SOURCE;
+
+        /* Over */
+        case GUAC_COMP_OVER:
+            return CAIRO_OPERATOR_OVER;
+
+        /* In */
+        case GUAC_COMP_IN:
+            return CAIRO_OPERATOR_IN;
+
+        /* Out */
+        case GUAC_COMP_OUT:
+            return CAIRO_OPERATOR_OUT;
+
+        /* Atop */
+        case GUAC_COMP_ATOP:
+            return CAIRO_OPERATOR_ATOP;
+
+        /* Over (source/destination reversed) */
+        case GUAC_COMP_ROVER:
+            return CAIRO_OPERATOR_DEST_OVER;
+
+        /* In (source/destination reversed) */
+        case GUAC_COMP_RIN:
+            return CAIRO_OPERATOR_DEST_IN;
+
+        /* Out (source/destination reversed) */
+        case GUAC_COMP_ROUT:
+            return CAIRO_OPERATOR_DEST_OUT;
+
+        /* Atop (source/destination reversed) */
+        case GUAC_COMP_RATOP:
+            return CAIRO_OPERATOR_DEST_ATOP;
+
+        /* XOR */
+        case GUAC_COMP_XOR:
+            return CAIRO_OPERATOR_XOR;
+
+        /* Additive */
+        case GUAC_COMP_PLUS:
+            return CAIRO_OPERATOR_ADD;
+
+        /* If unrecognized, just default to CAIRO_OPERATOR_OVER */
+        default:
+            return CAIRO_OPERATOR_OVER;
+
+    }
+
+}
+
 guacenc_display* guacenc_display_alloc() {
     return (guacenc_display*) calloc(1, sizeof(guacenc_display));
 }

src/guacenc/display.h

@@ -28,6 +28,7 @@
 #include "image-stream.h"
 #include "layer.h"
 
+#include <guacamole/protocol.h>
 #include <guacamole/timestamp.h>
 
 /**
@@ -204,5 +205,20 @@ int guacenc_display_free_buffer(guacenc_display* display,
 guacenc_buffer* guacenc_display_get_related_buffer(guacenc_display* display,
         int index);
 
+/**
+ * Translates the given Guacamole protocol compositing mode (channel mask) to
+ * the corresponding Cairo composition operator. If no such operator exists,
+ * CAIRO_OPERATOR_OVER will be returned by default.
+ *
+ * @param mask
+ *     The Guacamole protocol compositing mode (channel mask) to translate.
+ *
+ * @return
+ *     The cairo_operator_t that corresponds to the given compositing mode
+ *     (channel mask). CAIRO_OPERATOR_OVER will be returned by default if no
+ *     such operator exists.
+ */
+cairo_operator_t guacenc_display_cairo_operator(guac_composite_mode mask);
+
 #endif
 

src/guacenc/instruction-cfill.c

@@ -39,14 +39,23 @@ int guacenc_handle_cfill(guacenc_display* display, int argc, char** argv) {
     /* Parse arguments */
     int mask = atoi(argv[0]);
     int index = atoi(argv[1]);
-    int r = atoi(argv[2]);
-    int g = atoi(argv[3]);
-    int b = atoi(argv[4]);
-    int a = atoi(argv[5]);
+    double r = atoi(argv[2]) / 255.0;
+    double g = atoi(argv[3]) / 255.0;
+    double b = atoi(argv[4]) / 255.0;
+    double a = atoi(argv[5]) / 255.0;
+
+    /* Pull buffer of requested layer/buffer */
+    guacenc_buffer* buffer = guacenc_display_get_related_buffer(display, index);
+    if (buffer == NULL)
+        return 1;
+
+    /* Fill with RGBA color */
+    if (buffer->cairo != NULL) {
+        cairo_set_operator(buffer->cairo, guacenc_display_cairo_operator(mask));
+        cairo_set_source_rgba(buffer->cairo, r, g, b, a);
+        cairo_fill(buffer->cairo);
+    }
 
-    /* STUB */
-    guacenc_log(GUAC_LOG_DEBUG, "cfill: mask=0x%X layer=%i "
-            "rgba(%i, %i, %i, %i)", mask, index, r, g, b, a);
     return 0;
 
 }

src/guacenc/instruction-rect.c

@@ -21,9 +21,11 @@
  */
 
 #include "config.h"
+#include "buffer.h"
 #include "display.h"
 #include "log.h"
 
+#include <cairo/cairo.h>
 #include <guacamole/client.h>
 
 #include <stdlib.h>
@@ -43,9 +45,15 @@ int guacenc_handle_rect(guacenc_display* display, int argc, char** argv) {
     int width = atoi(argv[3]);
     int height = atoi(argv[4]);
 
-    /* STUB */
-    guacenc_log(GUAC_LOG_DEBUG, "rect: layer=%i (%i, %i) %ix%i",
-            index, x, y, width, height);
+    /* Pull buffer of requested layer/buffer */
+    guacenc_buffer* buffer = guacenc_display_get_related_buffer(display, index);
+    if (buffer == NULL)
+        return 1;
+
+    /* Set path to rectangle */
+    if (buffer->cairo != NULL)
+        cairo_rectangle(buffer->cairo, x, y, width, height);
+
     return 0;
 
 }