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https://github.com/mpv-player/mpv
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bd84c608ea
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16836 b3059339-0415-0410-9bf9-f77b7e298cf2
88 lines
2.7 KiB
Plaintext
88 lines
2.7 KiB
Plaintext
draft of new OSD engine:
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========================
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written by A'rpi
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including ideas from mailing list from Jiri Svoboda, Tobias Diedrich,
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Artur Zaprzala, Michael Niedermayer, Felix Buenemann, LGB
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requirements:
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- be able to do partial rendering, within a given bounding box
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useful when parts of the OSD are outside of the image and has to be
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updated only when OSD changes, or even has different colorspace
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- text should be rendered in 2-pass way: 1. alpha 2. pixels
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so char's alpha won't overwrite previous char, and may be faster
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- OSD elements should be cached - so rendering once into the cache and
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reuse this while it's unchanged
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- color support (colorspace could be YA, YUVA, RGB)
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- change brightness, saturation, hue of chars ???
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- way to disable alphablending, and use black outline (FAST_OSD now)
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- respect movie and monitor aspect, so OSD is rendered/scaled correctly
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eg. for SVCD/anamorphic DVD with hardware scaling (now OSD is squashed)
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- develop some text-based apps: osdterm, osdzilla etc ;)
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Ok. The basic idea of my design is using 'OSD objects', a data structure
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in a 1 (or 2?) way linked list.
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There would be different object types, sharing type-dependent data in a
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union. The basic types: box, text, symbol, progressbar, group.
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Group would be a special type, grouping other OSD objects together,
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with a common x,y and boundingbox. Useful for grouping symbol+progrbar
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or multiline subtitle text.
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Each object could have flags, for example:
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- visible (set if we should display it)
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- color (set if it's YUVA not YA)
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- cached (set when there is a cached rendered variant)
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- bbox updated (should be set when recalc bbox, reset when change params)
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- several flags to control positioning. for example, x;y could be
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absolute coordinates, or percent. flags to set left/center/right alignment...
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- start and end timestamp, to automagically set/reset visible flag
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OK, my first draft:
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typedef struct mp_osd_obj_s {
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struct mp_osd_obj_s* next;
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unsigned char type;
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unsigned char alignment; // 2 bits: x;y percentages, 2 bits: x;y relative to parent; 2 bits: alignment left/right/center
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unsigned short flags;
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int x,y; // coords
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unsigned char color[4]; // YUVA
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mp_osd_bbox_t bbox; // bounding box
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unsigned int start,duration; // PTS
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union {
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struct {
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int x1,y1,x2,y2;
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} line;
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struct {
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int x,y,w,h;
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} rect;
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struct {
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char* text;
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mp_font_t* font;
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} text;
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struct {
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int symbol; // unicode
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mp_font_t* font;
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} symbol;
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struct {
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float value;
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mp_font_t* font;
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} pbar;
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struct {
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int w,h;
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unsigned char* image;
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unsigned int* palette;
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} spu; // FIXME!
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struct {
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struct mp_osd_obj_s* children;
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} group;
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} params;
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} mp_osd_obj_t;
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