Add support to use preferred graphics backend
- Add #gr_init(backends) for users to use preferred graphics backend.
Bug: 196777741
Test: build, flash, and boot device.
Change-Id: I2621e879bbc7dce926a263a97a1013985d75592a
diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index dce1e61..f25694a 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -42,6 +42,9 @@
static GRSurface* gr_draw = nullptr;
static GRRotation rotation = GRRotation::NONE;
static PixelFormat pixel_format = PixelFormat::UNKNOWN;
+// The graphics backend list that provides fallback options for the default backend selection.
+// For example, it will fist try DRM, then try FBDEV if DRM is unavailable.
+constexpr auto default_backends = { GraphicsBackend::DRM, GraphicsBackend::FBDEV };
static bool outside(int x, int y) {
auto swapped = (rotation == GRRotation::LEFT || rotation == GRRotation::RIGHT);
@@ -340,7 +343,22 @@
gr_draw = gr_backend->Flip();
}
+std::unique_ptr<MinuiBackend> create_backend(GraphicsBackend backend) {
+ switch (backend) {
+ case GraphicsBackend::DRM:
+ return std::make_unique<MinuiBackendDrm>();
+ case GraphicsBackend::FBDEV:
+ return std::make_unique<MinuiBackendFbdev>();
+ default:
+ return nullptr;
+ }
+}
+
int gr_init() {
+ return gr_init(default_backends);
+}
+
+int gr_init(std::initializer_list<GraphicsBackend> backends) {
// pixel_format needs to be set before loading any resources or initializing backends.
std::string format = android::base::GetProperty("ro.minui.pixel_format", "");
if (format == "ABGR_8888") {
@@ -361,19 +379,22 @@
ret);
}
- auto backend = std::unique_ptr<MinuiBackend>{ std::make_unique<MinuiBackendDrm>() };
- gr_draw = backend->Init();
-
- if (!gr_draw) {
- backend = std::make_unique<MinuiBackendFbdev>();
- gr_draw = backend->Init();
+ std::unique_ptr<MinuiBackend> minui_backend;
+ for (GraphicsBackend backend : backends) {
+ minui_backend = create_backend(backend);
+ if (!minui_backend) {
+ printf("gr_init: minui_backend %d is a nullptr\n", backend);
+ continue;
+ }
+ gr_draw = minui_backend->Init();
+ if (gr_draw) break;
}
if (!gr_draw) {
return -1;
}
- gr_backend = backend.release();
+ gr_backend = minui_backend.release();
int overscan_percent = android::base::GetIntProperty("ro.minui.overscan_percent", 0);
overscan_offset_x = gr_draw->width * overscan_percent / 100;