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Commit 6f7362ab authored by Chihhang Chuang's avatar Chihhang Chuang
Browse files

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
parent 176a6c49

minui/graphics.cpp

+28 −7
Original line number Diff line number Diff line
@@ -42,6 +42,9 @@ static constexpr uint32_t alpha_mask = 0xff000000; 
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 @@ void gr_flip() { 
  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 @@ int gr_init() { 
           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;

minui/include/minui/minui.h

+12 −3
Original line number Diff line number Diff line
@@ -104,10 +104,19 @@ enum class PixelFormat : int { 
  ARGB = 4,

};



// Initializes the graphics backend and loads font file. Returns 0 on success, or -1 on error. Note

// that the font initialization failure would be non-fatal, as caller may not need to draw any text

// at all. Caller can check the font initialization result via gr_sys_font() as needed.

enum class GraphicsBackend : int {

  UNKNOWN = 0,

  DRM = 1,

  FBDEV = 2,

};



// Initializes the default graphics backend and loads font file. Returns 0 on success, or -1 on

// error. Note that the font initialization failure would be non-fatal, as caller may not need to

// draw any text at all. Caller can check the font initialization result via gr_sys_font() as

// needed.

int gr_init();

// Supports backend selection for minui client.

int gr_init(std::initializer_list<GraphicsBackend> backends);



// Frees the allocated resources. The function is idempotent, and safe to be called if gr_init()

// didn't finish successfully.