2 Copyright (C) 2016 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <cairomm/region.h>
21 #include <cairomm/surface.h>
22 #include <cairomm/context.h>
24 #include "pbd/compose.h"
26 #include "ardour/debug.h"
32 using namespace ArdourCanvas;
33 using namespace ArdourSurface;
36 const int Push2Canvas::pixels_per_row = 1024;
38 Push2Canvas::Push2Canvas (Push2& pr, int c, int r)
42 , frame_buffer (Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _cols, _rows))
44 context = Cairo::Context::create (frame_buffer);
45 expose_region = Cairo::Region::create ();
47 device_frame_buffer = new uint16_t[pixel_area()];
48 memset (device_frame_buffer, 0, sizeof (uint16_t) * pixel_area());
50 frame_header[0] = 0xef;
51 frame_header[1] = 0xcd;
52 frame_header[2] = 0xab;
53 frame_header[3] = 0x89;
55 memset (&frame_header[4], 0, 12);
58 Push2Canvas::~Push2Canvas ()
60 delete [] device_frame_buffer;
61 device_frame_buffer = 0;
65 Push2Canvas::vblank ()
67 /* re-render dirty areas, if any */
70 DEBUG_TRACE (DEBUG::Push2, "re-blit to device frame buffer\n");
71 /* something rendered, update device_frame_buffer */
72 blit_to_device_frame_buffer ();
76 const int timeout_msecs = 1000;
79 /* transfer to device */
81 if ((err = libusb_bulk_transfer (p2.usb_handle(), 0x01, frame_header, sizeof (frame_header), &transferred, timeout_msecs))) {
85 if ((err = libusb_bulk_transfer (p2.usb_handle(), 0x01, (uint8_t*) device_frame_buffer, 2 * pixel_area (), &transferred, timeout_msecs))) {
93 Push2Canvas::request_redraw ()
95 request_redraw (Rect (0, 0, _cols, _rows));
99 Push2Canvas::request_redraw (Rect const & r)
101 Cairo::RectangleInt cr;
105 cr.width = r.width();
106 cr.height = r.height();
108 DEBUG_TRACE (DEBUG::Push2, string_compose ("invalidate rect %1\n", r));
110 expose_region->do_union (cr);
112 /* next vblank will redraw */
116 Push2Canvas::expose ()
118 if (expose_region->empty()) {
119 return false; /* nothing drawn */
122 /* set up clipping */
124 const int nrects = expose_region->get_num_rectangles ();
126 DEBUG_TRACE (DEBUG::Push2, string_compose ("expose with %1 rects\n", nrects));
128 for (int n = 0; n < nrects; ++n) {
129 Cairo::RectangleInt r = expose_region->get_rectangle (n);
130 context->rectangle (r.x, r.y, r.width, r.height);
135 Push2Layout* layout = p2.current_layout();
138 Cairo::RectangleInt r = expose_region->get_extents();
139 Rect rr (r.x, r.y, r.x + r.width, r.y + r.height);
140 DEBUG_TRACE (DEBUG::Push2, string_compose ("render layout with %1\n", rr));
141 layout->render (Rect (r.x, r.y, r.x + r.width, r.y + r.height), context);
144 context->reset_clip ();
146 /* why is there no "reset()" method for Cairo::Region? */
148 expose_region = Cairo::Region::create ();
153 /** render host-side frame buffer (a Cairo ImageSurface) to the current
154 * device-side frame buffer. The device frame buffer will be pushed to the
155 * device on the next call to vblank()
159 Push2Canvas::blit_to_device_frame_buffer ()
161 /* ensure that all drawing has been done before we fetch pixel data */
163 frame_buffer->flush ();
165 const int stride = 3840; /* bytes per row for Cairo::FORMAT_ARGB32 */
166 const uint8_t* data = frame_buffer->get_data ();
168 /* fill frame buffer (320kB) */
170 uint16_t* fb = (uint16_t*) device_frame_buffer;
172 for (int row = 0; row < _rows; ++row) {
174 const uint8_t* dp = data + row * stride;
176 for (int col = 0; col < _cols; ++col) {
178 /* fetch r, g, b (range 0..255). Ignore alpha */
180 const int r = (*((const uint32_t*)dp) >> 16) & 0xff;
181 const int g = (*((const uint32_t*)dp) >> 8) & 0xff;
182 const int b = *((const uint32_t*)dp) & 0xff;
184 /* convert to 5 bits, 6 bits, 5 bits, respectively */
185 /* generate 16 bit BGB565 value */
187 *fb++ = (r >> 3) | ((g & 0xfc) << 3) | ((b & 0xf8) << 8);
189 /* the push2 docs state that we should xor the pixel
190 * data. Doing so doesn't work correctly, and not doing
191 * so seems to work fine (colors roughly match intended
198 /* skip 128 bytes to next line. This is filler, used to avoid line borders occuring in the middle of 512
202 fb += 64; /* 128 bytes = 64 int16_t */
209 Push2Canvas::request_size (Duple)
211 /* fixed size canvas */
215 Push2Canvas::visible_area () const
217 /* may need to get more sophisticated once we do scrolling */
218 return Rect (0, 0, 960, 160);