1 /**************************************************************************
5 * Copyright 2015 Samsung Electronics co., Ltd. All Rights Reserved.
7 * Contact: Eunchul Kim <chulspro.kim@samsung.com>,
8 * JinYoung Jeon <jy0.jeon@samsung.com>,
9 * Taeheon Kim <th908.kim@samsung.com>,
10 * YoungJun Cho <yj44.cho@samsung.com>,
11 * SooChan Lim <sc1.lim@samsung.com>,
12 * Boram Park <boram1288.park@samsung.com>
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34 **************************************************************************/
41 * @author Boram Park, boram1288.park@samsung.com
44 * TDM stands for Tizen Display Manager. It's the display HAL layer for tizen
45 * display server. It offers the frontend APIs(@ref tdm.h) for a frontend user
46 * and the abstraction interface(@ref tdm_backend.h) for a hardware vendor.
49 * TDM consists of display/output/layer/pp/capture objects. A frontend user can
50 * get the output/layer/pp/capture hardware information with each object.
51 * Basically, TDM supposes that all display devices have fixed outputs and
52 * layers. A frontend user can get these outputs and layers with
53 * #tdm_display_get_output_count, #tdm_display_get_output, #tdm_output_get_layer_count
54 * and #tdm_output_get_layer. To get a pp/capture object, however, a frontend
55 * user need to create a object with #tdm_display_create_pp, #tdm_output_create_capture
56 * and #tdm_layer_create_capture if available.\n
58 * All changes of output/layer/pp/capture objects are applied when committed.
59 * See #tdm_output_commit, #tdm_layer_commit, #tdm_pp_commit and #tdm_capture_commit.
61 * @par Buffer management
62 * TDM has its own buffer release mechanism to let an user know when a TDM buffer
63 * becomes available for a next job. A frontend user can add a user release handler
64 * to a TDM buffer with #tdm_buffer_add_release_handler, and this handler will be
65 * called when it's disappered from screen or when pp/capture operation is done.
67 * @par Implementing a TDM backend module(for a hardware vendor)
68 * A backend module @b SHOULD define the global data symbol of which name is
69 * @b "tdm_backend_module_data". TDM will read this symbol, @b "tdm_backend_module_data",
70 * at the initial time and call init() function of #tdm_backend_module.
71 * A backend module at least @b SHOULD register the #tdm_func_display,
72 * #tdm_func_output, #tdm_func_layer functions to a display object via
73 * #tdm_backend_register_func_display(), #tdm_backend_register_func_output(),
74 * #tdm_backend_register_func_layer() functions in initial time.\n
76 * #include <tdm_backend.h>
78 * static tdm_drm_data *drm_data;
81 * tdm_drm_init(tdm_display *dpy, tdm_error *error)
83 * tdm_func_display drm_func_display;
84 * tdm_func_output drm_func_output;
85 * tdm_func_layer drm_func_layer;
88 * drm_data = calloc(1, sizeof(tdm_drm_data));
91 * memset(&drm_func_display, 0, sizeof(drm_func_display));
92 * drm_func_display.display_get_capability = drm_display_get_capability;
94 * ret = tdm_backend_register_func_display(dpy, &drm_func_display);
95 * if (ret != TDM_ERROR_NONE)
98 * memset(&drm_func_output, 0, sizeof(drm_func_output));
99 * drm_func_output.output_get_capability = drm_output_get_capability;
101 * ret = tdm_backend_register_func_output(dpy, &drm_func_output);
102 * if (ret != TDM_ERROR_NONE)
105 * memset(&drm_func_layer, 0, sizeof(drm_func_layer));
106 * drm_func_layer.layer_get_capability = drm_layer_get_capability;
108 * ret = tdm_backend_register_func_layer(dpy, &drm_func_layer);
109 * if (ret != TDM_ERROR_NONE)
112 * return (tdm_backend_data*)drm_data;
116 * tdm_drm_deinit(tdm_backend_data *bdata)
122 * tdm_backend_module tdm_backend_module_data =
126 * TDM_BACKEND_SET_ABI_VERSION(1,2),
132 * A sample backend source code can be downloaded.
134 $ git clone ssh://{user_id}@review.tizen.org:29418/platform/core/uifw/libtdm-drm
137 * After loading a TDM backend module, TDM will call @b display_get_capability(),
138 * @b display_get_outputs(), @b output_get_capability(), @b output_get_layers(),
139 * @b layer_get_capability() functions to get the hardware information. That is,
140 * a TDM backend module @b SHOULD implement these 5 functions basically.\n
142 * In addition, if a hardware has a memory-to-memory converting device and the
143 * capture device, a backend module can register the #tdm_func_pp functions and
144 * #tdm_func_capture functions with #tdm_backend_register_func_pp() and
145 * #tdm_backend_register_func_capture().\n
147 * The @b "Remarks" part of <tdm_backend.h> explains what things should be
148 * careful for vendor to implement a TDM backend module.
151 #endif /* _TDM_DOC_H_ */