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628 lines
13 KiB
C
628 lines
13 KiB
C
#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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static cairo_status_t
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write_png_data (void *closure,
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const unsigned char *data,
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unsigned int data_len)
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{
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GString *buf = closure;
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g_string_append_len (buf, (char *)data, data_len);
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return CAIRO_STATUS_SUCCESS;
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}
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static void
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to_png_rgb (GString *buf, int w, int h, int byte_stride, guint32 *data)
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{
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cairo_surface_t *surface;
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surface = cairo_image_surface_create_for_data ((guchar *)data,
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CAIRO_FORMAT_RGB24, w, h, byte_stride);
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cairo_surface_write_to_png_stream (surface, write_png_data, buf);
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cairo_surface_destroy (surface);
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}
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static void
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to_png_rgba (GString *buf, int w, int h, int byte_stride, guint32 *data)
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{
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cairo_surface_t *surface;
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surface = cairo_image_surface_create_for_data ((guchar *)data,
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CAIRO_FORMAT_ARGB32, w, h, byte_stride);
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cairo_surface_write_to_png_stream (surface, write_png_data, buf);
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cairo_surface_destroy (surface);
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}
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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_char (BroadwayOutput *output, char 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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overwrite_uint32 (BroadwayOutput *output, gsize pos, guint32 v)
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{
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guint8 *buf = (guint8 *)output->buf->str + pos;
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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_char (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_copy_rectangles (BroadwayOutput *output, int id,
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BroadwayRect *rects, int n_rects,
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int dx, int dy)
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{
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int i;
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write_header (output, BROADWAY_OP_COPY_RECTANGLES);
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append_uint16 (output, id);
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append_uint16 (output, n_rects);
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for (i = 0; i < n_rects; i++)
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{
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append_uint16 (output, rects[i].x);
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append_uint16 (output, rects[i].y);
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append_uint16 (output, rects[i].width);
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append_uint16 (output, rects[i].height);
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}
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append_uint16 (output, dx);
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append_uint16 (output, dy);
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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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gboolean is_temp)
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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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append_bool (output, is_temp);
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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_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_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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void
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broadway_output_put_rgb (BroadwayOutput *output, int id, int x, int y,
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int w, int h, int byte_stride, void *data)
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{
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gsize size_start, image_start, len;
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write_header (output, BROADWAY_OP_PUT_RGB);
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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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size_start = output->buf->len;
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append_uint32 (output, 0);
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image_start = output->buf->len;
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to_png_rgb (output->buf, w, h, byte_stride, (guint32*)data);
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len = output->buf->len - image_start;
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overwrite_uint32 (output, size_start, len);
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}
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typedef struct {
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int x1, y1;
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int x2, y2;
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} BroadwayBox;
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static int
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is_any_x_set (unsigned char *data,
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int box_x1, int box_x2,
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int x1, int x2, int y, int *x_set,
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int byte_stride)
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{
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int w ;
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guint32 *ptr;
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if (x1 < box_x1)
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x1 = box_x1;
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if (x2 > box_x2)
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x2 = box_x2;
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w = x2 - x1;
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if (w > 0)
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{
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ptr = (guint32 *)(data + y * byte_stride + x1 * 4);
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while (w-- > 0)
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{
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if (*ptr != 0)
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{
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if (x_set)
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*x_set = x1;
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return 1;
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}
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ptr++;
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x1++;
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}
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}
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return 0;
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}
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#define EXTEND_X_FUZZ 10
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#define EXTEND_Y_FUZZ 10
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static int
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extend_x_range (unsigned char *data,
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int box_x1, int box_y1,
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int box_x2, int box_y2,
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int *x1, int *x2, int y,
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int byte_stride)
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{
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int extended = 0;
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int new_x;
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while (is_any_x_set (data, box_x1, box_x2, *x1 - EXTEND_X_FUZZ, *x1, y, &new_x, byte_stride))
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{
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*x1 = new_x;
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extended = 1;
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}
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while (is_any_x_set (data, box_x1, box_x2, *x2, *x2 + EXTEND_X_FUZZ, y, &new_x, byte_stride))
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{
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*x2 = new_x + 1;
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extended = 1;
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}
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return extended;
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}
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static int
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extend_y_range (unsigned char *data,
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int box_x1, int box_y1,
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int box_x2, int box_y2,
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int x1, int x2, int *y,
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int byte_stride)
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{
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int extended = 0;
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int found_set;
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int yy, y2;
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while (*y < box_y2)
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{
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found_set = 0;
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y2 = *y + EXTEND_Y_FUZZ;
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if (y2 > box_y2)
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y2 = box_y2;
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for (yy = y2; yy > *y + 1; yy--)
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{
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if (is_any_x_set (data, box_x1, box_x2, x1, x2, yy - 1, NULL, byte_stride))
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{
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found_set = 1;
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break;
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}
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}
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if (!found_set)
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break;
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*y = yy;
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extended = 1;
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}
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return extended;
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}
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static void
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rgba_find_rects_extents (unsigned char *data,
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int box_x1, int box_y1,
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int box_x2, int box_y2,
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int x, int y,
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BroadwayBox *rect,
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int byte_stride)
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{
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int x1, x2, y1, y2, yy;
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int extended;
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x1 = x;
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x2 = x + 1;
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y1 = y;
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y2 = y + 1;
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do
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{
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/* Expand maximally for all known rows */
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do
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{
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extended = 0;
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for (yy = y1; yy < y2; yy++)
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extended |= extend_x_range (data,
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box_x1, box_y1,
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box_x2, box_y2,
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&x1, &x2, yy,
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byte_stride);
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}
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while (extended);
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}
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while (extend_y_range(data,
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box_x1, box_y1,
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box_x2, box_y2,
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x1, x2, &y2,
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byte_stride));
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rect->x1 = x1;
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rect->x2 = x2;
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rect->y1 = y1;
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rect->y2 = y2;
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}
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static void
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rgba_find_rects_sub (unsigned char *data,
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int box_x1, int box_y1,
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int box_x2, int box_y2,
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int byte_stride,
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BroadwayBox **rects,
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int *n_rects, int *alloc_rects)
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{
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guint32 *line;
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BroadwayBox rect;
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int x, y;
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if (box_x1 == box_x2 || box_y1 == box_y2)
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return;
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for (y = box_y1; y < box_y2; y++)
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{
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line = (guint32 *)(data + y * byte_stride + box_x1 * 4);
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for (x = box_x1; x < box_x2; x++)
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{
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if (*line != 0)
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{
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rgba_find_rects_extents (data,
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box_x1, box_y1, box_x2, box_y2,
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x, y, &rect, byte_stride);
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if (*n_rects == *alloc_rects)
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{
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(*alloc_rects) *= 2;
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*rects = g_renew (BroadwayBox, *rects, *alloc_rects);
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}
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(*rects)[*n_rects] = rect;
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(*n_rects)++;
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rgba_find_rects_sub (data,
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box_x1, rect.y1,
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rect.x1, rect.y2,
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byte_stride,
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rects, n_rects, alloc_rects);
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rgba_find_rects_sub (data,
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rect.x2, rect.y1,
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box_x2, rect.y2,
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byte_stride,
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rects, n_rects, alloc_rects);
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rgba_find_rects_sub (data,
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box_x1, rect.y2,
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box_x2, box_y2,
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byte_stride,
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rects, n_rects, alloc_rects);
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return;
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}
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line++;
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}
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}
|
|
}
|
|
|
|
static BroadwayBox *
|
|
rgba_find_rects (unsigned char *data,
|
|
int w, int h, int byte_stride,
|
|
int *n_rects)
|
|
{
|
|
BroadwayBox *rects;
|
|
int alloc_rects;
|
|
|
|
alloc_rects = 20;
|
|
rects = g_new (BroadwayBox, alloc_rects);
|
|
|
|
*n_rects = 0;
|
|
rgba_find_rects_sub (data,
|
|
0, 0, w, h, byte_stride,
|
|
&rects, n_rects, &alloc_rects);
|
|
|
|
return rects;
|
|
}
|
|
|
|
void
|
|
broadway_output_put_rgba (BroadwayOutput *output, int id, int x, int y,
|
|
int w, int h, int byte_stride, void *data)
|
|
{
|
|
BroadwayBox *rects;
|
|
int i, n_rects;
|
|
gsize size_start, image_start, len;
|
|
|
|
rects = rgba_find_rects (data, w, h, byte_stride, &n_rects);
|
|
|
|
for (i = 0; i < n_rects; i++)
|
|
{
|
|
guint8 *subdata;
|
|
|
|
write_header (output, BROADWAY_OP_PUT_RGB);
|
|
append_uint16 (output, id);
|
|
append_uint16 (output, x + rects[i].x1);
|
|
append_uint16 (output, y + rects[i].y1);
|
|
|
|
size_start = output->buf->len;
|
|
append_uint32 (output, 0);
|
|
|
|
image_start = output->buf->len;
|
|
|
|
subdata = (guint8 *)data + rects[i].x1 * 4 + rects[i].y1 * byte_stride;
|
|
to_png_rgba (output->buf, rects[i].x2 - rects[i].x1,
|
|
rects[i].y2 - rects[i].y1,
|
|
byte_stride, (guint32*)subdata);
|
|
|
|
len = output->buf->len - image_start;
|
|
|
|
overwrite_uint32 (output, size_start, len);
|
|
}
|
|
|
|
free (rects);
|
|
}
|
|
|
|
void
|
|
broadway_output_surface_flush (BroadwayOutput *output,
|
|
int id)
|
|
{
|
|
write_header (output, BROADWAY_OP_FLUSH);
|
|
append_uint16 (output, id);
|
|
}
|