From d8b34ab0604d80d0be22b8b78e9aa6bf4fac7db0 Mon Sep 17 00:00:00 2001
From: Sian Cao <yinshuiboy@gmail.com>
Date: Thu, 27 Oct 2016 15:19:32 +0800
Subject: texture: Support copy_sub_image

The patch is used to implement feature similar with kwin blur effect
by being abel to copy partial of framebuffer contents as texture and
do post blurring.

Signed-off-by:
 Sian Cao <yinshuiboy@gmail.com>: initial
 Bowen Li <sensor.wen@gmail.com>: fix coding style

---
 cogl/cogl-atlas-texture.c                   |  1 +
 cogl/cogl-driver.h                          | 10 ++++++++
 cogl/cogl-sub-texture.c                     |  1 +
 cogl/cogl-texture-2d-sliced.c               |  1 +
 cogl/cogl-texture-2d.c                      | 30 ++++++++++++++++++++++
 cogl/cogl-texture-3d.c                      |  1 +
 cogl/cogl-texture-private.h                 |  9 +++++++
 cogl/cogl-texture-rectangle.c               |  1 +
 cogl/cogl-texture.c                         | 33 ++++++++++++++++++++++++
 cogl/cogl-texture.h                         |  9 +++++++
 cogl/driver/gl/cogl-texture-2d-gl-private.h |  9 +++++++
 cogl/driver/gl/cogl-texture-2d-gl.c         | 39 +++++++++++++++++++++++++++++
 cogl/driver/gl/gl/cogl-driver-gl.c          |  1 +
 cogl/driver/gl/gles/cogl-driver-gles.c      |  1 +
 cogl/driver/nop/cogl-driver-nop.c           |  1 +
 cogl/winsys/cogl-texture-pixmap-x11.c       |  1 +
 16 files changed, 148 insertions(+)

diff --git a/cogl/cogl-atlas-texture.c b/cogl/cogl-atlas-texture.c
index 1c8b569..e411302 100644
--- a/cogl/cogl-atlas-texture.c
+++ b/cogl/cogl-atlas-texture.c
@@ -1027,6 +1027,7 @@ cogl_atlas_texture_vtable =
     FALSE, /* not primitive */
     _cogl_atlas_texture_allocate,
     _cogl_atlas_texture_set_region,
+    NULL, /* copy_sub_image */
     NULL, /* get_data */
     _cogl_atlas_texture_foreach_sub_texture_in_region,
     _cogl_atlas_texture_get_max_waste,
diff --git a/cogl/cogl-driver.h b/cogl/cogl-driver.h
index 648228c..4a0aeaf 100644
--- a/cogl/cogl-driver.h
+++ b/cogl/cogl-driver.h
@@ -192,6 +192,16 @@ struct _CoglDriverVtable
                                    int level,
                                    CoglError **error);
 
+  CoglBool
+  (* texture_2d_copy_sub_image) (CoglTexture2D *tex_2d,
+                                 GLint xoffset,
+                                 GLint yoffset,
+                                 GLint x,
+                                 GLint y,
+                                 GLsizei width,
+                                 GLsizei height,
+                                 CoglError **error);
+
   /* Reads back the full contents of the given texture and write it to
    * @data in the given @format and with the given @rowstride.
    *
diff --git a/cogl/cogl-sub-texture.c b/cogl/cogl-sub-texture.c
index 7baf95e..0a16193 100644
--- a/cogl/cogl-sub-texture.c
+++ b/cogl/cogl-sub-texture.c
@@ -460,6 +460,7 @@ cogl_sub_texture_vtable =
     FALSE, /* not primitive */
     _cogl_sub_texture_allocate,
     _cogl_sub_texture_set_region,
+    NULL, /* copy_sub_image */
     NULL, /* get_data */
     _cogl_sub_texture_foreach_sub_texture_in_region,
     _cogl_sub_texture_get_max_waste,
diff --git a/cogl/cogl-texture-2d-sliced.c b/cogl/cogl-texture-2d-sliced.c
index e76bef6..b0b099f 100644
--- a/cogl/cogl-texture-2d-sliced.c
+++ b/cogl/cogl-texture-2d-sliced.c
@@ -1526,6 +1526,7 @@ cogl_texture_2d_sliced_vtable =
     FALSE, /* not primitive */
     _cogl_texture_2d_sliced_allocate,
     _cogl_texture_2d_sliced_set_region,
+    NULL, /* copy_sub_image */
     NULL, /* get_data */
     _cogl_texture_2d_sliced_foreach_sub_texture_in_region,
     _cogl_texture_2d_sliced_get_max_waste,
diff --git a/cogl/cogl-texture-2d.c b/cogl/cogl-texture-2d.c
index cc28cd9..d9ab188 100644
--- a/cogl/cogl-texture-2d.c
+++ b/cogl/cogl-texture-2d.c
@@ -628,6 +628,35 @@ _cogl_texture_2d_set_region (CoglTexture *tex,
 }
 
 static CoglBool
+_cogl_texture_2d_copy_sub_image (CoglTexture *tex,
+                                 GLint xoffset,
+                                 GLint yoffset,
+                                 GLint x,
+                                 GLint y,
+                                 GLsizei width,
+                                 GLsizei height,
+                                 CoglError **error)
+{
+  CoglContext *ctx = tex->context;
+  CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
+
+  cogl_texture_allocate (tex, NULL); /* (abort on error) */
+
+  ctx->driver_vtable->texture_2d_copy_sub_image (tex_2d,
+                                                 xoffset,
+                                                 yoffset,
+                                                 x,
+                                                 y,
+                                                 width,
+                                                 height,
+                                                 error);
+
+  tex_2d->mipmaps_dirty = TRUE;
+
+  return TRUE;
+}
+
+static CoglBool
 _cogl_texture_2d_get_data (CoglTexture *tex,
                            CoglPixelFormat format,
                            int rowstride,
@@ -675,6 +704,7 @@ cogl_texture_2d_vtable =
     TRUE, /* primitive */
     _cogl_texture_2d_allocate,
     _cogl_texture_2d_set_region,
+    _cogl_texture_2d_copy_sub_image,
     _cogl_texture_2d_get_data,
     NULL, /* foreach_sub_texture_in_region */
     _cogl_texture_2d_get_max_waste,
diff --git a/cogl/cogl-texture-3d.c b/cogl/cogl-texture-3d.c
index 8e2ff08..a59d386 100644
--- a/cogl/cogl-texture-3d.c
+++ b/cogl/cogl-texture-3d.c
@@ -741,6 +741,7 @@ cogl_texture_3d_vtable =
     TRUE, /* primitive */
     _cogl_texture_3d_allocate,
     _cogl_texture_3d_set_region,
+    NULL, /* copy_sub_image */
     _cogl_texture_3d_get_data,
     NULL, /* foreach_sub_texture_in_region */
     _cogl_texture_3d_get_max_waste,
diff --git a/cogl/cogl-texture-private.h b/cogl/cogl-texture-private.h
index 472c41d..34ff81c 100644
--- a/cogl/cogl-texture-private.h
+++ b/cogl/cogl-texture-private.h
@@ -90,6 +90,15 @@ struct _CoglTextureVtable
                            CoglBitmap *bitmap,
                            CoglError **error);
 
+    CoglBool (* copy_sub_image) (CoglTexture *texture,
+                                 GLint xoffset,
+                                 GLint yoffset,
+                                 GLint x,
+                                 GLint y,
+                                 GLsizei width,
+                                 GLsizei height,
+                                 CoglError **error);
+
   /* This should copy the image data of the texture into @data. The
      requested format will have been first passed through
      ctx->texture_driver->find_best_gl_get_data_format so it should
diff --git a/cogl/cogl-texture-rectangle.c b/cogl/cogl-texture-rectangle.c
index 65d2f06..9f533c9 100644
--- a/cogl/cogl-texture-rectangle.c
+++ b/cogl/cogl-texture-rectangle.c
@@ -761,6 +761,7 @@ cogl_texture_rectangle_vtable =
     TRUE, /* primitive */
     _cogl_texture_rectangle_allocate,
     _cogl_texture_rectangle_set_region,
+    NULL, /* copy_sub_image */
     _cogl_texture_rectangle_get_data,
     NULL, /* foreach_sub_texture_in_region */
     _cogl_texture_rectangle_get_max_waste,
diff --git a/cogl/cogl-texture.c b/cogl/cogl-texture.c
index d93db22..1f4b43c 100644
--- a/cogl/cogl-texture.c
+++ b/cogl/cogl-texture.c
@@ -514,6 +514,39 @@ cogl_texture_set_region (CoglTexture *texture,
 }
 
 CoglBool
+cogl_texture_copy_sub_image (CoglTexture *texture,
+                             int xoffset,
+                             int yoffset,
+                             int x,
+                             int y,
+                             size_t width,
+                             size_t height)
+{
+  CoglError *ignore_error = NULL;
+  CoglBool status;
+
+  if (!texture->allocated)
+    cogl_texture_allocate (texture, NULL);
+
+  if (!texture->vtable->copy_sub_image)
+    return FALSE;
+
+  status = texture->vtable->copy_sub_image (texture,
+                                            xoffset,
+                                            yoffset,
+                                            x,
+                                            y,
+                                            width,
+                                            height,
+                                            &ignore_error);
+
+  if (!status)
+    cogl_error_free (ignore_error);
+  return status;
+}
+
+
+CoglBool
 cogl_texture_set_data (CoglTexture *texture,
                        CoglPixelFormat format,
                        int rowstride,
diff --git a/cogl/cogl-texture.h b/cogl/cogl-texture.h
index 2718830..81657d1 100644
--- a/cogl/cogl-texture.h
+++ b/cogl/cogl-texture.h
@@ -399,6 +399,15 @@ cogl_texture_set_region (CoglTexture *texture,
                          unsigned int rowstride,
                          const uint8_t *data);
 
+CoglBool
+cogl_texture_copy_sub_image (CoglTexture *texture,
+                             int xoffset,
+                             int yoffset,
+                             int x,
+                             int y,
+                             size_t width,
+                             size_t height);
+
 #if defined (COGL_ENABLE_EXPERIMENTAL_API)
 
 /**
diff --git a/cogl/driver/gl/cogl-texture-2d-gl-private.h b/cogl/driver/gl/cogl-texture-2d-gl-private.h
index e5c6585..d2f9985 100644
--- a/cogl/driver/gl/cogl-texture-2d-gl-private.h
+++ b/cogl/driver/gl/cogl-texture-2d-gl-private.h
@@ -109,6 +109,15 @@ _cogl_texture_2d_gl_copy_from_bitmap (CoglTexture2D *tex_2d,
                                       int dst_y,
                                       int level,
                                       CoglError **error);
+CoglBool
+_cogl_texture_2d_gl_copy_sub_image (CoglTexture2D *tex_2d,
+                                    GLint xoffset,
+                                    GLint yoffset,
+                                    GLint x,
+                                    GLint y,
+                                    GLsizei width,
+                                    GLsizei height,
+                                    CoglError **error);
 
 void
 _cogl_texture_2d_gl_get_data (CoglTexture2D *tex_2d,
diff --git a/cogl/driver/gl/cogl-texture-2d-gl.c b/cogl/driver/gl/cogl-texture-2d-gl.c
index 8675f52..bc15ac5 100644
--- a/cogl/driver/gl/cogl-texture-2d-gl.c
+++ b/cogl/driver/gl/cogl-texture-2d-gl.c
@@ -35,6 +35,7 @@
 #include <config.h>
 
 #include <string.h>
+#include <stdio.h>
 
 #include "cogl-private.h"
 #include "cogl-texture-private.h"
@@ -719,6 +720,44 @@ _cogl_texture_2d_gl_copy_from_bitmap (CoglTexture2D *tex_2d,
   return status;
 }
 
+CoglBool
+_cogl_texture_2d_gl_copy_sub_image (CoglTexture2D *tex_2d,
+                                    GLint xoffset,
+                                    GLint yoffset,
+                                    GLint x,
+                                    GLint y,
+                                    GLsizei width,
+                                    GLsizei height,
+                                    CoglError **error)
+{
+  CoglContext *ctx = COGL_TEXTURE (tex_2d)->context;
+
+  if (ctx->current_read_buffer == NULL)
+    return FALSE;
+
+  if (ctx->current_draw_buffer)
+    _cogl_framebuffer_flush_journal (ctx->current_draw_buffer);
+
+  if (ctx->current_read_buffer != NULL &&
+      ctx->current_read_buffer != ctx->current_draw_buffer)
+    _cogl_framebuffer_flush_journal (ctx->current_read_buffer);
+
+  _cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
+                                   tex_2d->gl_texture,
+                                   tex_2d->is_foreign);
+
+  ctx->glCopyTexSubImage2D (GL_TEXTURE_2D,
+                            0,
+                            xoffset,
+                            yoffset,
+                            x,
+                            y,
+                            width,
+                            height);
+
+  return TRUE;
+}
+
 void
 _cogl_texture_2d_gl_get_data (CoglTexture2D *tex_2d,
                               CoglPixelFormat format,
diff --git a/cogl/driver/gl/gl/cogl-driver-gl.c b/cogl/driver/gl/gl/cogl-driver-gl.c
index f305b6a..f7f5020 100644
--- a/cogl/driver/gl/gl/cogl-driver-gl.c
+++ b/cogl/driver/gl/gl/cogl-driver-gl.c
@@ -695,6 +695,7 @@ _cogl_driver_gl =
     _cogl_texture_2d_gl_get_gl_handle,
     _cogl_texture_2d_gl_generate_mipmap,
     _cogl_texture_2d_gl_copy_from_bitmap,
+    _cogl_texture_2d_gl_copy_sub_image,
     _cogl_texture_2d_gl_get_data,
     _cogl_gl_flush_attributes_state,
     _cogl_clip_stack_gl_flush,
diff --git a/cogl/driver/gl/gles/cogl-driver-gles.c b/cogl/driver/gl/gles/cogl-driver-gles.c
index e94449f..f5ac771 100644
--- a/cogl/driver/gl/gles/cogl-driver-gles.c
+++ b/cogl/driver/gl/gles/cogl-driver-gles.c
@@ -476,6 +476,7 @@ _cogl_driver_gles =
     _cogl_texture_2d_gl_get_gl_handle,
     _cogl_texture_2d_gl_generate_mipmap,
     _cogl_texture_2d_gl_copy_from_bitmap,
+    _cogl_texture_2d_gl_copy_sub_image,
     NULL, /* texture_2d_get_data */
     _cogl_gl_flush_attributes_state,
     _cogl_clip_stack_gl_flush,
diff --git a/cogl/driver/nop/cogl-driver-nop.c b/cogl/driver/nop/cogl-driver-nop.c
index 53f5975..9d88955 100644
--- a/cogl/driver/nop/cogl-driver-nop.c
+++ b/cogl/driver/nop/cogl-driver-nop.c
@@ -80,6 +80,7 @@ _cogl_driver_nop =
     _cogl_texture_2d_nop_get_gl_handle,
     _cogl_texture_2d_nop_generate_mipmap,
     _cogl_texture_2d_nop_copy_from_bitmap,
+    NULL, /* texture_2d_copy_from_image */
     NULL, /* texture_2d_get_data */
     _cogl_nop_flush_attributes_state,
     _cogl_clip_stack_nop_flush,
diff --git a/cogl/winsys/cogl-texture-pixmap-x11.c b/cogl/winsys/cogl-texture-pixmap-x11.c
index 398c357..a44cdaf 100644
--- a/cogl/winsys/cogl-texture-pixmap-x11.c
+++ b/cogl/winsys/cogl-texture-pixmap-x11.c
@@ -1164,6 +1164,7 @@ cogl_texture_pixmap_x11_vtable =
     FALSE, /* not primitive */
     _cogl_texture_pixmap_x11_allocate,
     _cogl_texture_pixmap_x11_set_region,
+    NULL, /* copy_sub_image */
     _cogl_texture_pixmap_x11_get_data,
     _cogl_texture_pixmap_x11_foreach_sub_texture_in_region,
     _cogl_texture_pixmap_x11_get_max_waste,
-- 
2.9.5

