minui: Move GRSurface into a class.

This CL adds GRSurface::Create() and dtor for managing the allocated
memory in GRSurface class. It also adds GRSurface::data() that hides the
underlying implementation, with both of const and non-const overloads.
This allows `const GRSurface&` to be more useful - previously it only
ensured a const member variable of `data`, instead of a read-only buffer
it points to.

It also marks the parameters in gr_texticon() and gr_blit() as const, as
they're incoming source that shouldn't be altered. It corrects the type
of gr_draw, which is the sink to be painted on (an earlier attempt was
made in [1], but didn't get the full picture correctly).

[1] https://android-review.googlesource.com/c/platform/bootable/recovery/+/704757/

Test: mmma -j bootable/recovery
Test: recovery_unit_test on marlin
Test: Run graphics test on marlin (fbdev).
Test: Run graphics test on blueline (drm).
Change-Id: I7904df084cd6c08fa04a9da97d01b4b1a6e3a20c
diff --git a/minui/graphics_adf.cpp b/minui/graphics_adf.cpp
index 7439df9..6fc193f 100644
--- a/minui/graphics_adf.cpp
+++ b/minui/graphics_adf.cpp
@@ -45,14 +45,14 @@
   surf->row_bytes = surf->pitch;
   surf->pixel_bytes = (format == DRM_FORMAT_RGB565) ? 2 : 4;
 
-  surf->data = static_cast<uint8_t*>(
-      mmap(nullptr, surf->pitch * surf->height, PROT_WRITE, MAP_SHARED, surf->fd, surf->offset));
-  if (surf->data == MAP_FAILED) {
+  auto mmapped =
+      mmap(nullptr, surf->pitch * surf->height, PROT_WRITE, MAP_SHARED, surf->fd, surf->offset);
+  if (mmapped == MAP_FAILED) {
     int saved_errno = errno;
     close(surf->fd);
     return -saved_errno;
   }
-
+  surf->mmapped_buffer_ = static_cast<uint8_t*>(mmapped);
   return 0;
 }
 
@@ -185,7 +185,9 @@
 }
 
 void MinuiBackendAdf::SurfaceDestroy(GRSurfaceAdf* surf) {
-  munmap(surf->data, surf->pitch * surf->height);
+  if (surf->mmapped_buffer_) {
+    munmap(surf->mmapped_buffer_, surf->pitch * surf->height);
+  }
   close(surf->fence_fd);
   close(surf->fd);
 }