621 lines
17 KiB
C
621 lines
17 KiB
C
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <errno.h>
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#include <cairo.h>
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#include "broadway-output.h"
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//#define DEBUG_NODE_SENDING
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//#define DEBUG_NODE_SENDING_REMOVE
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/************************************************************************
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* Basic I/O primitives *
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************************************************************************/
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struct BroadwayOutput {
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GOutputStream *out;
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GString *buf;
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int error;
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guint32 serial;
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};
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static void
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broadway_output_send_cmd (BroadwayOutput *output,
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gboolean fin, BroadwayWSOpCode code,
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const void *buf, gsize count)
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{
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gboolean mask = FALSE;
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guchar header[16];
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size_t p;
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gboolean mid_header = count > 125 && count <= 65535;
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gboolean long_header = count > 65535;
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/* NB. big-endian spec => bit 0 == MSB */
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header[0] = ( (fin ? 0x80 : 0) | (code & 0x0f) );
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header[1] = ( (mask ? 0x80 : 0) |
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(mid_header ? 126 : long_header ? 127 : count) );
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p = 2;
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if (mid_header)
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{
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*(guint16 *)(header + p) = GUINT16_TO_BE( (guint16)count );
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p += 2;
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}
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else if (long_header)
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{
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*(guint64 *)(header + p) = GUINT64_TO_BE( count );
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p += 8;
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}
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// FIXME: if we are paranoid we should 'mask' the data
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// FIXME: we should really emit these as a single write
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g_output_stream_write_all (output->out, header, p, NULL, NULL, NULL);
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g_output_stream_write_all (output->out, buf, count, NULL, NULL, NULL);
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}
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void broadway_output_pong (BroadwayOutput *output)
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{
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broadway_output_send_cmd (output, TRUE, BROADWAY_WS_CNX_PONG, NULL, 0);
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}
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int
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broadway_output_flush (BroadwayOutput *output)
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{
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if (output->buf->len == 0)
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return TRUE;
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broadway_output_send_cmd (output, TRUE, BROADWAY_WS_BINARY,
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output->buf->str, output->buf->len);
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g_string_set_size (output->buf, 0);
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return !output->error;
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}
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BroadwayOutput *
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broadway_output_new (GOutputStream *out, guint32 serial)
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{
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BroadwayOutput *output;
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output = g_new0 (BroadwayOutput, 1);
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output->out = g_object_ref (out);
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output->buf = g_string_new ("");
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output->serial = serial;
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return output;
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}
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void
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broadway_output_free (BroadwayOutput *output)
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{
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g_object_unref (output->out);
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free (output);
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}
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guint32
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broadway_output_get_next_serial (BroadwayOutput *output)
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{
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return output->serial;
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}
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void
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broadway_output_set_next_serial (BroadwayOutput *output,
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guint32 serial)
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{
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output->serial = serial;
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}
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/************************************************************************
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* Core rendering operations *
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************************************************************************/
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static void
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append_uint8 (BroadwayOutput *output, guint8 c)
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{
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g_string_append_c (output->buf, c);
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}
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static void
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append_bool (BroadwayOutput *output, gboolean val)
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{
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g_string_append_c (output->buf, val ? 1: 0);
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}
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static void
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append_flags (BroadwayOutput *output, guint32 val)
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{
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g_string_append_c (output->buf, val);
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}
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static void
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append_uint16 (BroadwayOutput *output, guint32 v)
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{
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gsize old_len = output->buf->len;
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guint8 *buf;
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g_string_set_size (output->buf, old_len + 2);
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buf = (guint8 *)output->buf->str + old_len;
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buf[0] = (v >> 0) & 0xff;
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buf[1] = (v >> 8) & 0xff;
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}
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static void
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append_uint32 (BroadwayOutput *output, guint32 v)
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{
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gsize old_len = output->buf->len;
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guint8 *buf;
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g_string_set_size (output->buf, old_len + 4);
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buf = (guint8 *)output->buf->str + old_len;
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buf[0] = (v >> 0) & 0xff;
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buf[1] = (v >> 8) & 0xff;
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buf[2] = (v >> 16) & 0xff;
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buf[3] = (v >> 24) & 0xff;
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}
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static void
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patch_uint32 (BroadwayOutput *output, guint32 v, gsize offset)
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{
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guint8 *buf;
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buf = (guint8 *)output->buf->str + offset;
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buf[0] = (v >> 0) & 0xff;
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buf[1] = (v >> 8) & 0xff;
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buf[2] = (v >> 16) & 0xff;
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buf[3] = (v >> 24) & 0xff;
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}
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static void
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write_header(BroadwayOutput *output, char op)
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{
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append_uint8 (output, op);
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append_uint32 (output, output->serial++);
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}
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void
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broadway_output_grab_pointer (BroadwayOutput *output,
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int id,
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gboolean owner_event)
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{
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write_header (output, BROADWAY_OP_GRAB_POINTER);
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append_uint16 (output, id);
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append_bool (output, owner_event);
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}
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guint32
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broadway_output_ungrab_pointer (BroadwayOutput *output)
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{
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guint32 serial;
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serial = output->serial;
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write_header (output, BROADWAY_OP_UNGRAB_POINTER);
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return serial;
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}
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void
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broadway_output_new_surface(BroadwayOutput *output,
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int id, int x, int y, int w, int h)
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{
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write_header (output, BROADWAY_OP_NEW_SURFACE);
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append_uint16 (output, id);
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append_uint16 (output, x);
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append_uint16 (output, y);
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append_uint16 (output, w);
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append_uint16 (output, h);
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}
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void
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broadway_output_disconnected (BroadwayOutput *output)
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{
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write_header (output, BROADWAY_OP_DISCONNECTED);
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}
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void
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broadway_output_show_surface(BroadwayOutput *output, int id)
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{
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write_header (output, BROADWAY_OP_SHOW_SURFACE);
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append_uint16 (output, id);
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}
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void
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broadway_output_hide_surface(BroadwayOutput *output, int id)
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{
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write_header (output, BROADWAY_OP_HIDE_SURFACE);
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append_uint16 (output, id);
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}
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void
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broadway_output_raise_surface(BroadwayOutput *output, int id)
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{
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write_header (output, BROADWAY_OP_RAISE_SURFACE);
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append_uint16 (output, id);
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}
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void
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broadway_output_lower_surface(BroadwayOutput *output, int id)
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{
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write_header (output, BROADWAY_OP_LOWER_SURFACE);
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append_uint16 (output, id);
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}
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void
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broadway_output_destroy_surface(BroadwayOutput *output, int id)
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{
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write_header (output, BROADWAY_OP_DESTROY_SURFACE);
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append_uint16 (output, id);
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}
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void
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broadway_output_roundtrip (BroadwayOutput *output,
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int id,
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guint32 tag)
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{
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write_header (output, BROADWAY_OP_ROUNDTRIP);
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append_uint16 (output, id);
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append_uint32 (output, tag);
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}
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void
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broadway_output_set_show_keyboard (BroadwayOutput *output,
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gboolean show)
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{
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write_header (output, BROADWAY_OP_SET_SHOW_KEYBOARD);
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append_uint16 (output, show);
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}
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void
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broadway_output_move_resize_surface (BroadwayOutput *output,
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int id,
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gboolean has_pos,
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int x,
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int y,
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gboolean has_size,
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int w,
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int h)
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{
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int val;
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if (!has_pos && !has_size)
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return;
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write_header (output, BROADWAY_OP_MOVE_RESIZE);
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val = (!!has_pos) | ((!!has_size) << 1);
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append_uint16 (output, id);
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append_flags (output, val);
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if (has_pos)
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{
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append_uint16 (output, x);
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append_uint16 (output, y);
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}
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if (has_size)
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{
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append_uint16 (output, w);
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append_uint16 (output, h);
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}
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}
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void
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broadway_output_set_transient_for (BroadwayOutput *output,
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int id,
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int parent_id)
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{
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write_header (output, BROADWAY_OP_SET_TRANSIENT_FOR);
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append_uint16 (output, id);
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append_uint16 (output, parent_id);
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}
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static int append_node_depth = -1;
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static void
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append_type (BroadwayOutput *output, guint32 type, BroadwayNode *node)
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{
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#ifdef DEBUG_NODE_SENDING
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g_print ("%*s%s(%d/%d)", append_node_depth*2, "", broadway_node_type_names[type], node->id, node->output_id);
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if (type == BROADWAY_NODE_TEXTURE)
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g_print (" tx=%u", node->data[4]);
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g_print ("\n");
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#endif
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append_uint32 (output, type);
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}
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static BroadwayNode *
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lookup_old_node (GHashTable *old_node_lookup,
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guint32 id)
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{
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if (old_node_lookup)
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return g_hash_table_lookup (old_node_lookup, GINT_TO_POINTER (id));
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return NULL;
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}
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/***********************************
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* This outputs the tree to the client, while at the same time diffing
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* against the old tree. This allows us to avoid sending certain
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* parts.
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*
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* Reusing existing dom nodes are problematic because doing so
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* automatically inherits all their children. There are two cases
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* where we do this:
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*
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* If the entire sub tree is identical we emit a KEEP_ALL node which
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* just reuses the entire old dom subtree.
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*
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* If a the node is unchanged (but some descendant may have changed),
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* and all parents are also unchanged, then we can just avoid
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* changing the dom node at all, and we emit a KEEP_THIS node.
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*
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***********************************/
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static void
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append_node (BroadwayOutput *output,
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BroadwayNode *node,
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GHashTable *old_node_lookup)
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{
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guint32 i;
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BroadwayNode *reused_node;
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append_node_depth++;
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reused_node = lookup_old_node (old_node_lookup, node->id);
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if (reused_node)
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{
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broadway_node_mark_deep_consumed (reused_node, TRUE);
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append_type (output, BROADWAY_NODE_REUSE, node);
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append_uint32 (output, node->output_id);
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}
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else
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{
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append_type (output, node->type, node);
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append_uint32 (output, node->output_id);
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for (i = 0; i < node->n_data; i++)
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append_uint32 (output, node->data[i]);
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for (i = 0; i < node->n_children; i++)
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append_node (output,
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node->children[i],
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old_node_lookup);
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}
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||
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append_node_depth--;
|
||
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}
|
||
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||
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static gboolean
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||
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should_reuse_node (BroadwayOutput *output,
|
||
|
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BroadwayNode *node,
|
||
|
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BroadwayNode *old_node)
|
||
|
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{
|
||
|
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int i;
|
||
|
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guint32 new_texture;
|
||
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|
||
|
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if (old_node->reused)
|
||
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return FALSE;
|
||
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|
||
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if (node->type != old_node->type)
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
if (broadway_node_equal (node, old_node))
|
||
|
|
return TRUE;
|
||
|
|
|
||
|
|
switch (node->type) {
|
||
|
|
case BROADWAY_NODE_TRANSFORM:
|
||
|
|
#ifdef DEBUG_NODE_SENDING
|
||
|
|
g_print ("Patching transform node %d/%d\n",
|
||
|
|
old_node->id, old_node->output_id);
|
||
|
|
#endif
|
||
|
|
append_uint32 (output, BROADWAY_NODE_OP_PATCH_TRANSFORM);
|
||
|
|
append_uint32 (output, old_node->output_id);
|
||
|
|
for (i = 0; i < node->n_data; i++)
|
||
|
|
append_uint32 (output, node->data[i]);
|
||
|
|
return TRUE;
|
||
|
|
|
||
|
|
case BROADWAY_NODE_TEXTURE:
|
||
|
|
/* Check that the size, etc is the same */
|
||
|
|
for (i = 0; i < 4; i++)
|
||
|
|
if (node->data[i] != old_node->data[i])
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
new_texture = node->data[4];
|
||
|
|
|
||
|
|
#ifdef DEBUG_NODE_SENDING
|
||
|
|
g_print ("Patching texture node %d/%d to tx=%d\n",
|
||
|
|
old_node->id, old_node->output_id,
|
||
|
|
new_texture);
|
||
|
|
#endif
|
||
|
|
append_uint32 (output, BROADWAY_NODE_OP_PATCH_TEXTURE);
|
||
|
|
append_uint32 (output, old_node->output_id);
|
||
|
|
append_uint32 (output, new_texture);
|
||
|
|
return TRUE;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static BroadwayNode *
|
||
|
|
append_node_ops (BroadwayOutput *output,
|
||
|
|
BroadwayNode *node,
|
||
|
|
BroadwayNode *parent,
|
||
|
|
BroadwayNode *previous_sibling,
|
||
|
|
BroadwayNode *old_node,
|
||
|
|
GHashTable *old_node_lookup)
|
||
|
|
{
|
||
|
|
BroadwayNode *reused_node;
|
||
|
|
guint32 i;
|
||
|
|
|
||
|
|
/* Maybe can be reused from the last tree. */
|
||
|
|
reused_node = lookup_old_node (old_node_lookup, node->id);
|
||
|
|
if (reused_node)
|
||
|
|
{
|
||
|
|
g_assert (node == reused_node);
|
||
|
|
g_assert (reused_node->reused);
|
||
|
|
g_assert (!reused_node->consumed); /* Should only be once in the tree, and not consumed otherwise */
|
||
|
|
|
||
|
|
broadway_node_mark_deep_consumed (reused_node, TRUE);
|
||
|
|
|
||
|
|
if (node == old_node)
|
||
|
|
{
|
||
|
|
/* The node in the old tree at the current position is the same, so
|
||
|
|
we need to do nothing, just don't delete it (which we won't since
|
||
|
|
its marked used) */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* We can reuse it, bu it comes from a different place or
|
||
|
|
order, if so we need to move it in place */
|
||
|
|
#ifdef DEBUG_NODE_SENDING
|
||
|
|
g_print ("Move old node %d/%d to parent %d/%d after %d/%d\n",
|
||
|
|
reused_node->id, reused_node->output_id,
|
||
|
|
parent ? parent->id : 0,
|
||
|
|
parent ? parent->output_id : 0,
|
||
|
|
previous_sibling ? previous_sibling->id : 0,
|
||
|
|
previous_sibling ? previous_sibling->output_id : 0);
|
||
|
|
#endif
|
||
|
|
append_uint32 (output, BROADWAY_NODE_OP_MOVE_AFTER_CHILD);
|
||
|
|
append_uint32 (output, parent ? parent->output_id : 0);
|
||
|
|
append_uint32 (output, previous_sibling ? previous_sibling->output_id : 0);
|
||
|
|
append_uint32 (output, reused_node->output_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
return reused_node;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If the next node in place is shallowly equal (but not necessarily
|
||
|
|
* deep equal) we reuse it and tweak its children as needed.
|
||
|
|
* Except we avoid this for reused node as those make more sense to reuse deeply.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (old_node && should_reuse_node (output, node, old_node))
|
||
|
|
{
|
||
|
|
int old_i = 0;
|
||
|
|
BroadwayNode *last_child = NULL;
|
||
|
|
|
||
|
|
old_node->consumed = TRUE; // Don't reuse again
|
||
|
|
|
||
|
|
// We rewrite this new node as it now represents the old node in the browser
|
||
|
|
node->output_id = old_node->output_id;
|
||
|
|
|
||
|
|
/* However, we might need to rewrite then children of old_node */
|
||
|
|
for (i = 0; i < node->n_children; i++)
|
||
|
|
{
|
||
|
|
BroadwayNode *child = node->children[i];
|
||
|
|
|
||
|
|
/* Find the next (or first) non-consumed old child, if any */
|
||
|
|
while (old_i < old_node->n_children &&
|
||
|
|
old_node->children[old_i]->consumed)
|
||
|
|
old_i++;
|
||
|
|
|
||
|
|
last_child =
|
||
|
|
append_node_ops (output,
|
||
|
|
child,
|
||
|
|
node, /* parent */
|
||
|
|
last_child,
|
||
|
|
(old_i < old_node->n_children) ? old_node->children[old_i] : NULL,
|
||
|
|
old_node_lookup);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Remaining old nodes are either reused elsewhere, or end up marked not consumed so are deleted at the end */
|
||
|
|
return old_node;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Fallback to create a new tree */
|
||
|
|
#ifdef DEBUG_NODE_SENDING
|
||
|
|
g_print ("Insert nodes in parent %d/%d, after sibling %d/%d\n",
|
||
|
|
parent ? parent->id : 0,
|
||
|
|
parent ? parent->output_id : 0,
|
||
|
|
previous_sibling ? previous_sibling->id : 0,
|
||
|
|
previous_sibling ? previous_sibling->output_id : 0);
|
||
|
|
#endif
|
||
|
|
append_uint32 (output, BROADWAY_NODE_OP_INSERT_NODE);
|
||
|
|
append_uint32 (output, parent ? parent->output_id : 0);
|
||
|
|
append_uint32 (output, previous_sibling ? previous_sibling->output_id : 0);
|
||
|
|
|
||
|
|
append_node(output, node, old_node_lookup);
|
||
|
|
|
||
|
|
return node;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Remove non-consumed nodes */
|
||
|
|
static void
|
||
|
|
append_node_removes (BroadwayOutput *output,
|
||
|
|
BroadwayNode *node)
|
||
|
|
{
|
||
|
|
// TODO: Use an array of nodes instead
|
||
|
|
if (!node->consumed)
|
||
|
|
{
|
||
|
|
#ifdef DEBUG_NODE_SENDING_REMOVE
|
||
|
|
g_print ("Remove old node non-consumed node %d/%d\n",
|
||
|
|
node->id, node->output_id);
|
||
|
|
#endif
|
||
|
|
append_uint32 (output, BROADWAY_NODE_OP_REMOVE_NODE);
|
||
|
|
append_uint32 (output, node->output_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = 0; i < node->n_children; i++)
|
||
|
|
append_node_removes (output, node->children[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
void
|
||
|
|
broadway_output_surface_set_nodes (BroadwayOutput *output,
|
||
|
|
int id,
|
||
|
|
BroadwayNode *root,
|
||
|
|
BroadwayNode *old_root,
|
||
|
|
GHashTable *old_node_lookup)
|
||
|
|
{
|
||
|
|
gsize size_pos, start, end;
|
||
|
|
|
||
|
|
|
||
|
|
if (old_root)
|
||
|
|
{
|
||
|
|
broadway_node_mark_deep_consumed (old_root, FALSE);
|
||
|
|
broadway_node_mark_deep_reused (old_root, FALSE);
|
||
|
|
/* This will modify children of old_root if any are shared */
|
||
|
|
broadway_node_mark_deep_reused (root, TRUE);
|
||
|
|
}
|
||
|
|
|
||
|
|
write_header (output, BROADWAY_OP_SET_NODES);
|
||
|
|
|
||
|
|
append_uint16 (output, id);
|
||
|
|
|
||
|
|
size_pos = output->buf->len;
|
||
|
|
append_uint32 (output, 0);
|
||
|
|
|
||
|
|
start = output->buf->len;
|
||
|
|
#ifdef DEBUG_NODE_SENDING
|
||
|
|
g_print ("====== node ops for surface %d =======\n", id);
|
||
|
|
#endif
|
||
|
|
append_node_ops (output, root, NULL, NULL, old_root, old_node_lookup);
|
||
|
|
if (old_root)
|
||
|
|
append_node_removes (output, old_root);
|
||
|
|
end = output->buf->len;
|
||
|
|
patch_uint32 (output, (end - start) / 4, size_pos);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
broadway_output_upload_texture (BroadwayOutput *output,
|
||
|
|
guint32 id,
|
||
|
|
GBytes *texture)
|
||
|
|
{
|
||
|
|
gsize len = g_bytes_get_size (texture);
|
||
|
|
write_header (output, BROADWAY_OP_UPLOAD_TEXTURE);
|
||
|
|
append_uint32 (output, id);
|
||
|
|
append_uint32 (output, (guint32)len);
|
||
|
|
g_string_append_len (output->buf, g_bytes_get_data (texture, NULL), len);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
broadway_output_release_texture (BroadwayOutput *output,
|
||
|
|
guint32 id)
|
||
|
|
{
|
||
|
|
write_header (output, BROADWAY_OP_RELEASE_TEXTURE);
|
||
|
|
append_uint32 (output, id);
|
||
|
|
}
|