class GRSurface { public: static constexpr size_t kSurfaceDataAlignment = 8;
virtual ~GRSurface() = default;
// Creates and returns a GRSurface instance that's sufficient for storing an image of the given // size (i.e. row_bytes * height). The starting address of the surface data is aligned to // kSurfaceDataAlignment. Returns the created GRSurface instance (in std::unique_ptr), or nullptr // on error. static std::unique_ptr<GRSurface> Create(size_t width, size_t height, size_t row_bytes,
size_t pixel_bytes);
// Clones the current GRSurface instance (i.e. an image).
std::unique_ptr<GRSurface> Clone() const;
// 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. void gr_exit();
// Clears entire surface to current color. void gr_clear(); void gr_color(unsignedchar r, unsignedchar g, unsignedchar b, unsignedchar a); void gr_fill(int x1, int y1, int x2, int y2);
void gr_texticon(int x, int y, const GRSurface* icon);
const GRFont* gr_sys_font(); int gr_init_font(constchar* name, GRFont** dest); void gr_text(const GRFont* font, int x, int y, constchar* s, bool bold); // Returns -1 if font is nullptr. int gr_measure(const GRFont* font, constchar* s); // Returns -1 if font is nullptr. int gr_font_size(const GRFont* font, int* x, int* y);
void gr_blit(const GRSurface* source, int sx, int sy, int w, int h, int dx, int dy); unsignedint gr_get_width(const GRSurface* surface); unsignedint gr_get_height(const GRSurface* surface);
// Get current rotation
GRRotation gr_get_rotation();
// Returns the current PixelFormat being used.
PixelFormat gr_pixel_format();
// // Input events. //
struct input_event;
using ev_callback = std::function<int(int fd, uint32_t epevents)>; using ev_set_key_callback = std::function<int(int code, int value)>; using ev_set_sw_callback = std::function<int(int code, int value)>;
int ev_init(ev_callback input_cb, bool allow_touch_inputs = false); void ev_exit(); int ev_add_fd(android::base::unique_fd&& fd, ev_callback cb); void ev_iterate_available_keys(const std::function<void(int)>& f); void ev_iterate_touch_inputs(const std::function<void(int)>& action); int ev_sync_key_state(const ev_set_key_callback& set_key_cb); int ev_sync_sw_state(const ev_set_sw_callback& set_sw_cb);
// 'timeout' has the same semantics as poll(2). // 0 : don't block // < 0 : block forever // > 0 : block for 'timeout' milliseconds int ev_wait(int timeout);
int ev_get_input(int fd, uint32_t epevents, input_event* ev); void ev_dispatch(); int ev_get_epollfd();
// res_create_*_surface() functions return 0 if no error, else // negative. // // A "display" surface is one that is intended to be drawn to the // screen with gr_blit(). An "alpha" surface is a grayscale image // interpreted as an alpha mask used to render text in the current // color (with gr_text() or gr_texticon()). // // All these functions load PNG images from "/res/images/${name}.png".
// Load a single display surface from a PNG image. int res_create_display_surface(constchar* name, GRSurface** pSurface);
// Load an array of display surfaces from a single PNG image. The PNG // should have a 'Frames' text chunk whose value is the number of // frames this image represents. The pixel data itself is interlaced // by row. int res_create_multi_display_surface(constchar* name, int* frames, int* fps,
GRSurface*** pSurface);
// Load a single alpha surface from a grayscale PNG image. int res_create_alpha_surface(constchar* name, GRSurface** pSurface);
// Load part of a grayscale PNG image that is the first match for the // given locale. The image is expected to be a composite of multiple // translations of the same text, with special added rows that encode // the subimages' size and intended locale in the pixel data. See // bootable/recovery/tools/recovery_l10n for an app that will generate // these specialized images from Android resources. int res_create_localized_alpha_surface(constchar* name, constchar* locale,
GRSurface** pSurface);
// Return a list of locale strings embedded in |png_name|. Return a empty list in case of failure.
std::vector<std::string> get_locales_in_png(const std::string& png_name);
// Free a surface allocated by any of the res_create_*_surface() // functions. void res_free_surface(GRSurface* surface);
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