From 912cd80f10e9667d65741204df773639a62803b0 Mon Sep 17 00:00:00 2001
From: Robert Mader <robert.mader@collabora.com>
Date: Sat, 26 Aug 2023 15:01:48 +0200
Subject: [PATCH] cogl/scanout: Add API for source/destination rectangles

These will get passed on to KMS later.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3177>
---
 cogl/cogl/cogl-scanout.c                  | 75 +++++++++++++++++++++++
 cogl/cogl/cogl-scanout.h                  | 23 +++++++
 src/backends/native/meta-drm-buffer-gbm.c | 18 ++++++
 3 files changed, 116 insertions(+)

diff --git a/cogl/cogl/cogl-scanout.c b/cogl/cogl/cogl-scanout.c
index 3efb914a0..94f5d5df7 100644
--- a/cogl/cogl/cogl-scanout.c
+++ b/cogl/cogl/cogl-scanout.c
@@ -45,6 +45,11 @@ struct _CoglScanout
   GObject parent;
 
   CoglScanoutBuffer *scanout_buffer;
+
+  gboolean has_src_rect;
+  graphene_rect_t src_rect;
+  gboolean has_dst_rect;
+  MtkRectangle dst_rect;
 };
 
 G_DEFINE_FINAL_TYPE (CoglScanout, cogl_scanout, G_TYPE_OBJECT);
@@ -67,6 +72,24 @@ cogl_scanout_blit_to_framebuffer (CoglScanout      *scanout,
   return iface->blit_to_framebuffer (scanout, framebuffer, x, y, error);
 }
 
+int
+cogl_scanout_buffer_get_width (CoglScanoutBuffer *scanout_buffer)
+{
+  CoglScanoutBufferInterface *iface =
+    COGL_SCANOUT_BUFFER_GET_IFACE (scanout_buffer);
+
+  return iface->get_width (scanout_buffer);
+}
+
+int
+cogl_scanout_buffer_get_height (CoglScanoutBuffer *scanout_buffer)
+{
+  CoglScanoutBufferInterface *iface =
+    COGL_SCANOUT_BUFFER_GET_IFACE (scanout_buffer);
+
+  return iface->get_height (scanout_buffer);
+}
+
 CoglScanoutBuffer *
 cogl_scanout_get_buffer (CoglScanout *scanout)
 {
@@ -90,6 +113,58 @@ cogl_scanout_new (CoglScanoutBuffer *scanout_buffer)
   return scanout;
 }
 
+void
+cogl_scanout_get_src_rect (CoglScanout     *scanout,
+                           graphene_rect_t *rect)
+{
+  if (scanout->has_src_rect)
+    {
+      *rect = scanout->src_rect;
+      return;
+    }
+
+  rect->origin.x = 0;
+  rect->origin.y = 0;
+  rect->size.width = cogl_scanout_buffer_get_width (scanout->scanout_buffer);
+  rect->size.height = cogl_scanout_buffer_get_height (scanout->scanout_buffer);
+}
+
+void
+cogl_scanout_set_src_rect (CoglScanout           *scanout,
+                           const graphene_rect_t *rect)
+{
+  if (rect != NULL)
+    scanout->src_rect = *rect;
+
+  scanout->has_src_rect = rect != NULL;
+}
+
+void
+cogl_scanout_get_dst_rect (CoglScanout  *scanout,
+                           MtkRectangle *rect)
+{
+  if (scanout->has_dst_rect)
+    {
+      *rect = scanout->dst_rect;
+      return;
+    }
+
+  rect->x = 0;
+  rect->y = 0;
+  rect->width = cogl_scanout_buffer_get_width (scanout->scanout_buffer);
+  rect->height = cogl_scanout_buffer_get_height (scanout->scanout_buffer);
+}
+
+void
+cogl_scanout_set_dst_rect (CoglScanout        *scanout,
+                           const MtkRectangle *rect)
+{
+  if (rect != NULL)
+    scanout->dst_rect = *rect;
+
+  scanout->has_dst_rect = rect != NULL;
+}
+
 static void
 cogl_scanout_finalize (GObject *object)
 {
diff --git a/cogl/cogl/cogl-scanout.h b/cogl/cogl/cogl-scanout.h
index c8007e60e..2529eecb6 100644
--- a/cogl/cogl/cogl-scanout.h
+++ b/cogl/cogl/cogl-scanout.h
@@ -30,6 +30,7 @@
 #include "cogl/cogl-types.h"
 #include "cogl/cogl-framebuffer.h"
 #include "cogl/cogl-onscreen.h"
+#include "mtk/mtk.h"
 
 #include <glib-object.h>
 
@@ -52,6 +53,9 @@ struct _CoglScanoutBufferInterface
                                    int               x,
                                    int               y,
                                    GError          **error);
+
+  int (*get_width) (CoglScanoutBuffer *scanout_buffer);
+  int (*get_height) (CoglScanoutBuffer *scanout_buffer);
 };
 
 COGL_EXPORT
@@ -61,6 +65,9 @@ gboolean cogl_scanout_blit_to_framebuffer (CoglScanout      *scanout,
                                            int               y,
                                            GError          **error);
 
+int cogl_scanout_buffer_get_width (CoglScanoutBuffer *scanout_buffer);
+int cogl_scanout_buffer_get_height (CoglScanoutBuffer *scanout_buffer);
+
 COGL_EXPORT
 CoglScanoutBuffer * cogl_scanout_get_buffer (CoglScanout *scanout);
 
@@ -70,3 +77,19 @@ void cogl_scanout_notify_failed (CoglScanout  *scanout,
 
 COGL_EXPORT
 CoglScanout * cogl_scanout_new (CoglScanoutBuffer *scanout_buffer);
+
+COGL_EXPORT
+void cogl_scanout_get_src_rect (CoglScanout     *scanout,
+                                graphene_rect_t *rect);
+
+COGL_EXPORT
+void cogl_scanout_set_src_rect (CoglScanout           *scanout,
+                                const graphene_rect_t *rect);
+
+COGL_EXPORT
+void cogl_scanout_get_dst_rect (CoglScanout  *scanout,
+                                MtkRectangle *rect);
+
+COGL_EXPORT
+void cogl_scanout_set_dst_rect (CoglScanout        *scanout,
+                                const MtkRectangle *rect);
diff --git a/src/backends/native/meta-drm-buffer-gbm.c b/src/backends/native/meta-drm-buffer-gbm.c
index c2ed99e38..161d43957 100644
--- a/src/backends/native/meta-drm-buffer-gbm.c
+++ b/src/backends/native/meta-drm-buffer-gbm.c
@@ -357,10 +357,28 @@ out:
   return result;
 }
 
+static int
+meta_drm_buffer_gbm_scanout_get_width (CoglScanoutBuffer *scanout_buffer)
+{
+  MetaDrmBuffer *buffer = META_DRM_BUFFER (scanout_buffer);
+
+  return meta_drm_buffer_get_width (buffer);
+}
+
+static int
+meta_drm_buffer_gbm_scanout_get_height (CoglScanoutBuffer *scanout_buffer)
+{
+  MetaDrmBuffer *buffer = META_DRM_BUFFER (scanout_buffer);
+
+  return meta_drm_buffer_get_height (buffer);
+}
+
 static void
 cogl_scanout_buffer_iface_init (CoglScanoutBufferInterface *iface)
 {
   iface->blit_to_framebuffer = meta_drm_buffer_gbm_blit_to_framebuffer;
+  iface->get_width = meta_drm_buffer_gbm_scanout_get_width;
+  iface->get_height = meta_drm_buffer_gbm_scanout_get_height;
 }
 
 static void