[gtk/wip/chergert/gdk-macos-gl-renderer] gl: remove unused texture_from_surface API

[Christian Hergert <chergert src gnome org>]

commit 277df49aa10e5ddc14c9f1c3704852c062340b5a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Oct 28 16:49:55 2020 -0700

    gl: remove unused texture_from_surface API
    
    This is not used anywhere and only exists within the X11 backend. It
    can be removed now.

 gdk/gdkglcontextprivate.h  |   4 --
 gdk/x11/gdkglcontext-x11.c | 124 ---------------------------------------------
 2 files changed, 128 deletions(-)
---
diff --git a/gdk/gdkglcontextprivate.h b/gdk/gdkglcontextprivate.h
index e785fbc63d..07310eebfa 100644
--- a/gdk/gdkglcontextprivate.h
+++ b/gdk/gdkglcontextprivate.h
@@ -49,10 +49,6 @@ struct _GdkGLContextClass
                         GError **error);
 
   cairo_region_t * (* get_damage) (GdkGLContext *context);
-
-  gboolean (* texture_from_surface) (GdkGLContext    *context,
-                                     cairo_surface_t *surface,
-                                     cairo_region_t  *region);
 };
 
 typedef struct {
diff --git a/gdk/x11/gdkglcontext-x11.c b/gdk/x11/gdkglcontext-x11.c
index ec0bb2f454..89c75959f7 100644
--- a/gdk/x11/gdkglcontext-x11.c
+++ b/gdk/x11/gdkglcontext-x11.c
@@ -387,129 +387,6 @@ glx_pixmap_get (cairo_surface_t *surface, guint texture_target)
   return glx_pixmap;
 }
 
-static gboolean
-gdk_x11_gl_context_texture_from_surface (GdkGLContext *paint_context,
-                                        cairo_surface_t *cairo_surface,
-                                        cairo_region_t *region)
-{
-  GdkGLXPixmap *glx_pixmap;
-  double device_x_offset, device_y_offset;
-  cairo_rectangle_int_t rect;
-  int n_rects, i;
-  GdkSurface *surface;
-  int unscaled_surface_height;
-  int surface_scale;
-  unsigned int texture_id;
-  gboolean use_texture_rectangle;
-  guint target;
-  double sx, sy;
-  float uscale, vscale;
-  GdkTexturedQuad *quads;
-  GdkX11Display *display_x11;
-
-  display_x11 = GDK_X11_DISPLAY (gdk_gl_context_get_display (paint_context));
-  if (!display_x11->has_glx_texture_from_pixmap)
-    return FALSE;
-
-  if (cairo_surface_get_type (cairo_surface) != CAIRO_SURFACE_TYPE_XLIB)
-    return FALSE;
-
-  use_texture_rectangle = gdk_gl_context_use_texture_rectangle (paint_context);
-  if (use_texture_rectangle)
-    target = GL_TEXTURE_RECTANGLE_ARB;
-  else
-    target = GL_TEXTURE_2D;
-
-  glx_pixmap = glx_pixmap_get (cairo_surface, target);
-  if (glx_pixmap == NULL)
-    return FALSE;
-
-  GDK_DISPLAY_NOTE (GDK_DISPLAY (display_x11), OPENGL, g_message ("Using GLX_EXT_texture_from_pixmap to draw 
surface"));
-
-  surface = gdk_gl_context_get_surface (paint_context);
-  surface_scale = gdk_surface_get_scale_factor (surface);
-  gdk_surface_get_unscaled_size (surface, NULL, &unscaled_surface_height);
-
-  sx = sy = 1;
-  cairo_surface_get_device_scale (cairo_surface, &sx, &sy);
-  cairo_surface_get_device_offset (cairo_surface, &device_x_offset, &device_y_offset);
-
-  /* Ensure all the X stuff are synced before we read it back via texture-from-pixmap */
-  glXWaitX();
-
-  glGenTextures (1, &texture_id);
-  glBindTexture (target, texture_id);
-
-  glTexParameteri (target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri (target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri (target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri (target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-
-  glXBindTexImageEXT (glx_pixmap->display, glx_pixmap->drawable,
-                     GLX_FRONT_LEFT_EXT, NULL);
-
-  glEnable (GL_SCISSOR_TEST);
-
-  n_rects = cairo_region_num_rectangles (region);
-  quads = g_new (GdkTexturedQuad, n_rects);
-
-#define FLIP_Y(_y) (unscaled_surface_height - (_y))
-
-  cairo_region_get_extents (region, &rect);
-  glScissor (rect.x * surface_scale, FLIP_Y((rect.y + rect.height) * surface_scale),
-             rect.width * surface_scale, rect.height * surface_scale);
-
-  for (i = 0; i < n_rects; i++)
-    {
-      int src_x, src_y, src_height, src_width;
-
-      cairo_region_get_rectangle (region, i, &rect);
-
-      src_x = rect.x * sx + device_x_offset;
-      src_y = rect.y * sy + device_y_offset;
-      src_width = rect.width * sx;
-      src_height = rect.height * sy;
-
-      if (use_texture_rectangle)
-        {
-          uscale = 1.0;
-          vscale = 1.0;
-        }
-      else
-        {
-          uscale = 1.0 / cairo_xlib_surface_get_width (cairo_surface);
-          vscale = 1.0 / cairo_xlib_surface_get_height (cairo_surface);
-        }
-
-      {
-        GdkTexturedQuad quad = {
-          rect.x * surface_scale, FLIP_Y(rect.y * surface_scale),
-          (rect.x + rect.width) * surface_scale, FLIP_Y((rect.y + rect.height) * surface_scale),
-          uscale * src_x, vscale * src_y,
-          uscale * (src_x + src_width), vscale * (src_y + src_height),
-        };
-
-        quads[i] = quad;
-      }
-    }
-
-#undef FLIP_Y
-
-  gdk_gl_texture_quads (paint_context, target, n_rects, quads, FALSE);
-  g_free (quads);
-
-  glDisable (GL_SCISSOR_TEST);
-
-  glXReleaseTexImageEXT (glx_pixmap->display, glx_pixmap->drawable,
-                        GLX_FRONT_LEFT_EXT);
-
-  glDeleteTextures (1, &texture_id);
-
-  glx_pixmap_destroy(glx_pixmap);
-
-  return TRUE;
-}
-
 static XVisualInfo *
 find_xvisinfo_for_fbconfig (GdkDisplay  *display,
                             GLXFBConfig  config)
@@ -972,7 +849,6 @@ gdk_x11_gl_context_class_init (GdkX11GLContextClass *klass)
 
   context_class->realize = gdk_x11_gl_context_realize;
   context_class->get_damage = gdk_x11_gl_context_get_damage;
-  context_class->texture_from_surface = gdk_x11_gl_context_texture_from_surface;
 
   draw_context_class->end_frame = gdk_x11_gl_context_end_frame;