/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H #define ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H #include #include #include #include #include __BEGIN_DECLS /*****************************************************************************/ #define HWC_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1) #define HWC_DEVICE_API_VERSION_0_1 HARDWARE_DEVICE_API_VERSION(0, 1) #define HWC_DEVICE_API_VERSION_0_2 HARDWARE_DEVICE_API_VERSION(0, 2) #define HWC_DEVICE_API_VERSION_0_3 HARDWARE_DEVICE_API_VERSION(0, 3) // for compatibility #define HWC_MODULE_API_VERSION HWC_MODULE_API_VERSION_0_1 #define HWC_DEVICE_API_VERSION HWC_DEVICE_API_VERSION_0_1 #define HWC_API_VERSION HWC_DEVICE_API_VERSION /** * The id of this module */ #define HWC_HARDWARE_MODULE_ID "hwcomposer" /** * Name of the sensors device to open */ #define HWC_HARDWARE_COMPOSER "composer" enum { /* hwc_composer_device_t::set failed in EGL */ HWC_EGL_ERROR = -1 }; /* * hwc_layer_t::hints values * Hints are set by the HAL and read by SurfaceFlinger */ enum { /* * HWC can set the HWC_HINT_TRIPLE_BUFFER hint to indicate to SurfaceFlinger * that it should triple buffer this layer. Typically HWC does this when * the layer will be unavailable for use for an extended period of time, * e.g. if the display will be fetching data directly from the layer and * the layer can not be modified until after the next set(). */ HWC_HINT_TRIPLE_BUFFER = 0x00000001, /* * HWC sets HWC_HINT_CLEAR_FB to tell SurfaceFlinger that it should clear the * framebuffer with transparent pixels where this layer would be. * SurfaceFlinger will only honor this flag when the layer has no blending * */ HWC_HINT_CLEAR_FB = 0x00000002 }; /* * hwc_layer_t::flags values * Flags are set by SurfaceFlinger and read by the HAL */ enum { /* * HWC_SKIP_LAYER is set by SurfaceFlnger to indicate that the HAL * shall not consider this layer for composition as it will be handled * by SurfaceFlinger (just as if compositionType was set to HWC_OVERLAY). */ HWC_SKIP_LAYER = 0x00000001, }; /* * hwc_layer_t::compositionType values */ enum { /* this layer is to be drawn into the framebuffer by SurfaceFlinger */ HWC_FRAMEBUFFER = 0, /* this layer will be handled in the HWC */ HWC_OVERLAY = 1, /* this is the background layer. it's used to set the background color. * there is only a single background layer */ HWC_BACKGROUND = 2, }; /* * hwc_layer_t::blending values */ enum { /* no blending */ HWC_BLENDING_NONE = 0x0100, /* ONE / ONE_MINUS_SRC_ALPHA */ HWC_BLENDING_PREMULT = 0x0105, /* SRC_ALPHA / ONE_MINUS_SRC_ALPHA */ HWC_BLENDING_COVERAGE = 0x0405 }; /* * hwc_layer_t::transform values */ enum { /* flip source image horizontally */ HWC_TRANSFORM_FLIP_H = HAL_TRANSFORM_FLIP_H, /* flip source image vertically */ HWC_TRANSFORM_FLIP_V = HAL_TRANSFORM_FLIP_V, /* rotate source image 90 degrees clock-wise */ HWC_TRANSFORM_ROT_90 = HAL_TRANSFORM_ROT_90, /* rotate source image 180 degrees */ HWC_TRANSFORM_ROT_180 = HAL_TRANSFORM_ROT_180, /* rotate source image 270 degrees clock-wise */ HWC_TRANSFORM_ROT_270 = HAL_TRANSFORM_ROT_270, }; /* attributes queriable with query() */ enum { /* * availability: HWC_DEVICE_API_VERSION_0_2 * must return 1 if the background layer is supported, 0 otherwise */ HWC_BACKGROUND_LAYER_SUPPORTED = 0, /* * availability: HWC_DEVICE_API_VERSION_0_3 * returns the vsync period in nanosecond */ HWC_VSYNC_PERIOD = 1, }; /* Allowed events for hwc_methods::eventControl() */ enum { HWC_EVENT_VSYNC = 0 }; struct hwc_composer_device; /* * availability: HWC_DEVICE_API_VERSION_0_3 * * struct hwc_methods cannot be embedded in other structures as * sizeof(struct hwc_methods) cannot be relied upon. * */ typedef struct hwc_methods { /************************************************************************* * HWC_DEVICE_API_VERSION_0_3 *************************************************************************/ /* * eventControl(..., event, enabled) * Enables or disables h/w composer events. * * eventControl can be called from any thread and takes effect * immediately. * * Supported events are: * HWC_EVENT_VSYNC * * returns -EINVAL if the "event" parameter is not one of the value above * or if the "enabled" parameter is not 0 or 1. */ int (*eventControl)( struct hwc_composer_device* dev, int event, int enabled); } hwc_methods_t; typedef struct hwc_rect { int left; int top; int right; int bottom; } hwc_rect_t; typedef struct hwc_region { size_t numRects; hwc_rect_t const* rects; } hwc_region_t; typedef struct hwc_color { uint8_t r; uint8_t g; uint8_t b; uint8_t a; } hwc_color_t; typedef struct hwc_layer { /* * initially set to HWC_FRAMEBUFFER or HWC_BACKGROUND. * HWC_FRAMEBUFFER * indicates the layer will be drawn into the framebuffer * using OpenGL ES. * The HWC can toggle this value to HWC_OVERLAY, to indicate * it will handle the layer. * * HWC_BACKGROUND * indicates this is a special "background" layer. The only valid * field is backgroundColor. HWC_BACKGROUND can only be used with * HWC_API_VERSION >= 0.2 * The HWC can toggle this value to HWC_FRAMEBUFFER, to indicate * it CANNOT handle the background color * */ int32_t compositionType; /* see hwc_layer_t::hints above */ uint32_t hints; /* see hwc_layer_t::flags above */ uint32_t flags; union { /* color of the background. hwc_color_t.a is ignored */ hwc_color_t backgroundColor; struct { /* handle of buffer to compose. This handle is guaranteed to have been * allocated from gralloc using the GRALLOC_USAGE_HW_COMPOSER usage flag. If * the layer's handle is unchanged across two consecutive prepare calls and * the HWC_GEOMETRY_CHANGED flag is not set for the second call then the * HWComposer implementation may assume that the contents of the buffer have * not changed. */ buffer_handle_t handle; /* transformation to apply to the buffer during composition */ uint32_t transform; /* blending to apply during composition */ int32_t blending; /* area of the source to consider, the origin is the top-left corner of * the buffer */ hwc_rect_t sourceCrop; /* where to composite the sourceCrop onto the display. The sourceCrop * is scaled using linear filtering to the displayFrame. The origin is the * top-left corner of the screen. */ hwc_rect_t displayFrame; /* visible region in screen space. The origin is the * top-left corner of the screen. * The visible region INCLUDES areas overlapped by a translucent layer. */ hwc_region_t visibleRegionScreen; }; }; } hwc_layer_t; /* * hwc_layer_list_t::flags values */ enum { /* * HWC_GEOMETRY_CHANGED is set by SurfaceFlinger to indicate that the list * passed to (*prepare)() has changed by more than just the buffer handles. */ HWC_GEOMETRY_CHANGED = 0x00000001, }; /* * List of layers. * The handle members of hwLayers elements must be unique. */ typedef struct hwc_layer_list { uint32_t flags; size_t numHwLayers; hwc_layer_t hwLayers[0]; } hwc_layer_list_t; /* This represents a display, typically an EGLDisplay object */ typedef void* hwc_display_t; /* This represents a surface, typically an EGLSurface object */ typedef void* hwc_surface_t; /* see hwc_composer_device::registerProcs() * Any of the callbacks can be NULL, in which case the corresponding * functionality is not supported. */ typedef struct hwc_procs { /* * (*invalidate)() triggers a screen refresh, in particular prepare and set * will be called shortly after this call is made. Note that there is * NO GUARANTEE that the screen refresh will happen after invalidate() * returns (in particular, it could happen before). * invalidate() is GUARANTEED TO NOT CALL BACK into the h/w composer HAL and * it is safe to call invalidate() from any of hwc_composer_device * hooks, unless noted otherwise. */ void (*invalidate)(struct hwc_procs* procs); /* * (*vsync)() is called by the h/w composer HAL when a vsync event is * received and HWC_EVENT_VSYNC is enabled (see: hwc_event_control). * * the "zero" parameter must always be 0. * the "timestamp" parameter is the system monotonic clock timestamp in * nanosecond of when the vsync event happened. * * vsync() is GUARANTEED TO NOT CALL BACK into the h/w composer HAL. * * It is expected that vsync() is called from a thread of at least * HAL_PRIORITY_URGENT_DISPLAY with as little latency as possible, * typically less than 0.5 ms. * * It is a (silent) error to have HWC_EVENT_VSYNC enabled when calling * hwc_composer_device.set(..., 0, 0, 0) (screen off). The implementation * can either stop or continue to process VSYNC events, but must not * crash or cause other problems. * */ void (*vsync)(struct hwc_procs* procs, int zero, int64_t timestamp); } hwc_procs_t; /*****************************************************************************/ typedef struct hwc_module { struct hw_module_t common; } hwc_module_t; typedef struct hwc_composer_device { struct hw_device_t common; /* * (*prepare)() is called for each frame before composition and is used by * SurfaceFlinger to determine what composition steps the HWC can handle. * * (*prepare)() can be called more than once, the last call prevails. * * The HWC responds by setting the compositionType field to either * HWC_FRAMEBUFFER or HWC_OVERLAY. In the former case, the composition for * this layer is handled by SurfaceFlinger with OpenGL ES, in the later * case, the HWC will have to handle this layer's composition. * * (*prepare)() is called with HWC_GEOMETRY_CHANGED to indicate that the * list's geometry has changed, that is, when more than just the buffer's * handles have been updated. Typically this happens (but is not limited to) * when a window is added, removed, resized or moved. * * a NULL list parameter or a numHwLayers of zero indicates that the * entire composition will be handled by SurfaceFlinger with OpenGL ES. * * returns: 0 on success. An negative error code on error. If an error is * returned, SurfaceFlinger will assume that none of the layer will be * handled by the HWC. */ int (*prepare)(struct hwc_composer_device *dev, hwc_layer_list_t* list); /* * (*set)() is used in place of eglSwapBuffers(), and assumes the same * functionality, except it also commits the work list atomically with * the actual eglSwapBuffers(). * * The list parameter is guaranteed to be the same as the one returned * from the last call to (*prepare)(). * * When this call returns the caller assumes that: * * - the display will be updated in the near future with the content * of the work list, without artifacts during the transition from the * previous frame. * * - all objects are available for immediate access or destruction, in * particular, hwc_region_t::rects data and hwc_layer_t::layer's buffer. * Note that this means that immediately accessing (potentially from a * different process) a buffer used in this call will not result in * screen corruption, the driver must apply proper synchronization or * scheduling (eg: block the caller, such as gralloc_module_t::lock(), * OpenGL ES, Camera, Codecs, etc..., or schedule the caller's work * after the buffer is freed from the actual composition). * * a NULL list parameter or a numHwLayers of zero indicates that the * entire composition has been handled by SurfaceFlinger with OpenGL ES. * In this case, (*set)() behaves just like eglSwapBuffers(). * * dpy, sur, and list are set to NULL to indicate that the screen is * turning off. This happens WITHOUT prepare() being called first. * This is a good time to free h/w resources and/or power * the relevant h/w blocks down. * * IMPORTANT NOTE: there is an implicit layer containing opaque black * pixels behind all the layers in the list. * It is the responsibility of the hwcomposer module to make * sure black pixels are output (or blended from). * * returns: 0 on success. An negative error code on error: * HWC_EGL_ERROR: eglGetError() will provide the proper error code * Another code for non EGL errors. * */ int (*set)(struct hwc_composer_device *dev, hwc_display_t dpy, hwc_surface_t sur, hwc_layer_list_t* list); /* * This field is OPTIONAL and can be NULL. * * If non NULL it will be called by SurfaceFlinger on dumpsys */ void (*dump)(struct hwc_composer_device* dev, char *buff, int buff_len); /* * This field is OPTIONAL and can be NULL. * * (*registerProcs)() registers a set of callbacks the h/w composer HAL * can later use. It is FORBIDDEN to call any of the callbacks from * within registerProcs(). registerProcs() must save the hwc_procs_t pointer * which is needed when calling a registered callback. * Each call to registerProcs replaces the previous set of callbacks. * registerProcs is called with NULL to unregister all callbacks. * * Any of the callbacks can be NULL, in which case the corresponding * functionality is not supported. */ void (*registerProcs)(struct hwc_composer_device* dev, hwc_procs_t const* procs); /* * This field is OPTIONAL and can be NULL. * availability: HWC_DEVICE_API_VERSION_0_2 * * Used to retrieve information about the h/w composer * * Returns 0 on success or -errno on error. */ int (*query)(struct hwc_composer_device* dev, int what, int* value); /* * Reserved for future use. Must be NULL. */ void* reserved_proc[4]; /* * This field is OPTIONAL and can be NULL. * availability: HWC_DEVICE_API_VERSION_0_3 */ hwc_methods_t const *methods; } hwc_composer_device_t; /** convenience API for opening and closing a device */ static inline int hwc_open(const struct hw_module_t* module, hwc_composer_device_t** device) { return module->methods->open(module, HWC_HARDWARE_COMPOSER, (struct hw_device_t**)device); } static inline int hwc_close(hwc_composer_device_t* device) { return device->common.close(&device->common); } /*****************************************************************************/ __END_DECLS #endif /* ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H */