/* * Copyright (C) 2011-2013 Paul Davis * Copyright (C) 2017 Tim Mayberry * Copyright (C) 2017-2019 Robin Gareus * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include "pbd/base_ui.h" #include "pbd/compose.h" #include "pbd/convert.h" #include "pbd/signals.h" #include "temporal/tempo.h" #include "ardour/types.h" #include "ardour/dB.h" #include "ardour/lmath.h" #include "ardour/audioregion.h" #include "ardour/audiosource.h" #include "ardour/session.h" #include "gtkmm2ext/colors.h" #include "gtkmm2ext/gui_thread.h" #include "gtkmm2ext/utils.h" #include "canvas/canvas.h" #include "canvas/debug.h" #include "waveview/wave_view.h" #include "waveview/wave_view_private.h" #ifdef __APPLE__ #define Rect ArdourCanvas::Rect #endif using namespace std; using namespace PBD; using namespace ARDOUR; using namespace Gtkmm2ext; using namespace ArdourCanvas; using namespace ArdourWaveView; double WaveView::_global_gradient_depth = 0.6; bool WaveView::_global_logscaled = false; WaveView::Shape WaveView::_global_shape = WaveView::Normal; bool WaveView::_global_show_waveform_clipping = true; double WaveView::_global_clip_level = 0.98853; PBD::Signal WaveView::VisualPropertiesChanged; PBD::Signal WaveView::ClipLevelChanged; /* NO_THREAD_WAVEVIEWS is defined by the top level wscript * if --no-threaded-waveviws is provided at the configure step. */ #ifndef NO_THREADED_WAVEVIEWS #define ENABLE_THREADED_WAVEFORM_RENDERING #endif WaveView::WaveView (Canvas* c, std::shared_ptr region) : Item (c) , _region (region) , _props (new WaveViewProperties (region)) , _shape_independent (false) , _logscaled_independent (false) , _gradient_depth_independent (false) , _draw_image_in_gui_thread (false) , _always_draw_image_in_gui_thread (false) { init (); } WaveView::WaveView (Item* parent, std::shared_ptr region) : Item (parent) , _region (region) , _props (new WaveViewProperties (region)) , _shape_independent (false) , _logscaled_independent (false) , _gradient_depth_independent (false) , _draw_image_in_gui_thread (false) , _always_draw_image_in_gui_thread (false) { init (); } void WaveView::init () { #ifdef ENABLE_THREADED_WAVEFORM_RENDERING WaveViewThreads::initialize (); #endif _props->fill_color = _fill_color; _props->outline_color = _outline_color; VisualPropertiesChanged.connect_same_thread ( invalidation_connection, std::bind (&WaveView::handle_visual_property_change, this)); ClipLevelChanged.connect_same_thread (invalidation_connection, std::bind (&WaveView::handle_clip_level_change, this)); } WaveView::~WaveView () { #ifdef ENABLE_THREADED_WAVEFORM_RENDERING WaveViewThreads::deinitialize (); #endif reset_cache_group (); } string WaveView::debug_name() const { return _region->name () + string (":") + PBD::to_string (_props->channel + 1); } void WaveView::set_always_get_image_in_thread (bool yn) { _always_draw_image_in_gui_thread = yn; } void WaveView::handle_visual_property_change () { bool changed = false; if (!_shape_independent && (_props->shape != global_shape())) { _props->shape = global_shape(); changed = true; } if (!_logscaled_independent && (_props->logscaled != global_logscaled())) { _props->logscaled = global_logscaled(); changed = true; } if (!_gradient_depth_independent && (_props->gradient_depth != global_gradient_depth())) { _props->gradient_depth = global_gradient_depth(); changed = true; } if (changed) { begin_visual_change (); end_visual_change (); } } void WaveView::handle_clip_level_change () { begin_visual_change (); end_visual_change (); } void WaveView::set_fill_color (Color c) { if (c != _fill_color) { begin_visual_change (); Fill::set_fill_color (c); _props->fill_color = _fill_color; // ugh end_visual_change (); } } void WaveView::set_outline_color (Color c) { if (c != _outline_color) { begin_visual_change (); Outline::set_outline_color (c); _props->outline_color = c; end_visual_change (); } } void WaveView::set_samples_per_pixel (double samples_per_pixel) { if (_props->samples_per_pixel != samples_per_pixel) { begin_change (); _props->samples_per_pixel = samples_per_pixel; set_bbox_dirty (); end_change (); } } static inline float _log_meter (float power, double lower_db, double upper_db, double non_linearity) { return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity)); } static inline float alt_log_meter (float power) { return _log_meter (power, -192.0, 0.0, 8.0); } void WaveView::set_clip_level (double dB) { const double clip_level = dB_to_coefficient (dB); if (_global_clip_level != clip_level) { _global_clip_level = clip_level; ClipLevelChanged (); } } std::shared_ptr WaveView::create_draw_request (WaveViewProperties const& props) const { assert (props.is_valid()); std::shared_ptr request (new WaveViewDrawRequest); request->image = std::shared_ptr (new WaveViewImage (_region, props)); return request; } void WaveView::prepare_for_render (Rect const& area) const { if (draw_image_in_gui_thread()) { // Drawing image in GUI thread in WaveView::render return; } Rect draw_rect; Rect self_rect; // all in window coordinate space if (!get_item_and_draw_rect_in_window_coords (area, self_rect, draw_rect)) { return; } double const image_start_pixel_offset = draw_rect.x0 - self_rect.x0; double const image_end_pixel_offset = draw_rect.x1 - self_rect.x0; WaveViewProperties required_props = *_props; required_props.set_sample_positions_from_pixel_offsets (image_start_pixel_offset, image_end_pixel_offset); if (!required_props.is_valid ()) { return; } if (_image) { if (_image->props.is_equivalent (required_props)) { return; } else { // Image does not contain sample area required } } std::shared_ptr request = create_draw_request (required_props); queue_draw_request (request); } bool WaveView::get_item_and_draw_rect_in_window_coords (Rect const& canvas_rect, Rect& item_rect, Rect& draw_rect) const { /* a WaveView is intimately connected to an AudioRegion. It will * display the waveform within the region, anywhere from the start of * the region to its end. * * the area we've been asked to render may overlap with area covered * by the region in any of the normal ways: * * - it may begin and end within the area covered by the region * - it may start before and end after the area covered by region * - it may start before and end within the area covered by the region * - it may start within and end after the area covered by the region * - it may be precisely coincident with the area covered by region. * * So let's start by determining the area covered by the region, in * window coordinates. It begins at zero (in item coordinates for this * waveview, and extends to region_length() / _samples_per_pixel. */ double const width = region_length() / _props->samples_per_pixel; item_rect = item_to_window (Rect (0.0, 0.0, width, _props->height), false); item_rect.x0 = floor (item_rect.x0); item_rect.x1 = ceil (item_rect.x1); item_rect.y0 = round (item_rect.y0); item_rect.y1 = round (item_rect.y1); /* Now lets get the intersection with the area we've been asked to draw */ draw_rect = item_rect.intersection (canvas_rect); if (!draw_rect) { // No intersection with drawing area return false; } /* draw_rect now defines the rectangle we need to update/render the waveview * into, in window coordinate space. * * We round down in case we were asked to draw "between" pixels at the start * and/or end. */ draw_rect.x0 = floor (draw_rect.x0); draw_rect.x1 = ceil (draw_rect.x1); return true; } void WaveView::queue_draw_request (std::shared_ptr const& request) const { // Don't enqueue any requests without a thread to dequeue them. assert (WaveViewThreads::enabled()); if (!request || !request->is_valid()) { return; } if (current_request) { current_request->cancel (); } std::shared_ptr cached_image = get_cache_group ()->lookup_image (request->image->props); if (cached_image) { // The image may not be finished at this point but that is fine, great in // fact as it means it should only need to be drawn once. request->image = cached_image; current_request = request; } else { // now we can finally set an optimal image now that we are not using the // properties for comparisons. request->image->props.set_width_samples (optimal_image_width_samples ()); current_request = request; // Add it to the cache so that other WaveViews can refer to the same image get_cache_group()->add_image (current_request->image); WaveViewThreads::enqueue_draw_request (current_request); } } void WaveView::compute_tips (ARDOUR::PeakData const& peak, WaveView::LineTips& tips, double const effective_height) { /* remember: canvas (and cairo) coordinate space puts the origin at the upper left. * * So, a sample value of 1.0 (0dbFS) will be computed as: * (1.0 - 1.0) * 0.5 * effective_height * which evaluates to 0, or the top of the image. * * A sample value of -1.0 will be computed as * (1.0 + 1.0) * 0.5 * effective height * which evaluates to effective height, or the bottom of the image. */ const double pmax = (1.0 - peak.max) * floor (0.5 * effective_height); const double pmin = (1.0 - peak.min) * floor (0.5 * effective_height); if (pmax * pmin < 0) { /* signal crosses zero, round away from 0 */ tips.top = ceil (pmax); tips.bot = floor (pmin); } else { tips.top = rint (pmax); tips.bot = rint (pmin); } if (tips.top > tips.bot) { tips.top = tips.bot = rint (0.5 * (tips.top + tips.bot)); } } Coord WaveView::y_extent (double s, Shape const shape, double const height) { assert (shape == Rectified); return floor ((1.0 - s) * height); } void WaveView::draw_absent_image (Cairo::RefPtr& image, PeakData* peaks, int n_peaks) { const double height = image->get_height(); Cairo::RefPtr stripe = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height); Cairo::RefPtr stripe_context = Cairo::Context::create (stripe); stripe_context->set_antialias (Cairo::ANTIALIAS_NONE); uint32_t stripe_separation = 150; double start = - floor (height / stripe_separation) * stripe_separation; int stripe_x = 0; while (start < n_peaks) { stripe_context->move_to (start, 0); stripe_x = start + height; stripe_context->line_to (stripe_x, height); start += stripe_separation; } stripe_context->set_source_rgba (1.0, 1.0, 1.0, 1.0); stripe_context->set_line_cap (Cairo::LINE_CAP_SQUARE); stripe_context->set_line_width(50); stripe_context->stroke(); Cairo::RefPtr context = Cairo::Context::create (image); context->set_source_rgba (1.0, 1.0, 0.0, 0.3); context->mask (stripe, 0, 0); context->fill (); } struct ImageSet { Cairo::RefPtr wave; Cairo::RefPtr outline; Cairo::RefPtr clip; Cairo::RefPtr zero; ImageSet() : wave (0), outline (0), clip (0), zero (0) {} }; void WaveView::draw_image (Cairo::RefPtr& image, PeakData* peaks, int n_peaks, std::shared_ptr req) { const double height = image->get_height(); ImageSet images; images.wave = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height); images.outline = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height); images.clip = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height); images.zero = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height); Cairo::RefPtr wave_context = Cairo::Context::create (images.wave); Cairo::RefPtr outline_context = Cairo::Context::create (images.outline); Cairo::RefPtr clip_context = Cairo::Context::create (images.clip); Cairo::RefPtr zero_context = Cairo::Context::create (images.zero); outline_context->set_antialias (Cairo::ANTIALIAS_NONE); clip_context->set_antialias (Cairo::ANTIALIAS_NONE); zero_context->set_antialias (Cairo::ANTIALIAS_NONE); std::unique_ptr tips (new LineTips[n_peaks]); /* Clip level nominally set to -0.9dBFS to account for inter-sample interpolation possibly clipping (value may be too low). We adjust by the region's own gain (but note: not by any gain automation or its gain envelope) so that clip indicators are closer to providing data about on-disk data. This multiplication is needed because the data we get from AudioRegion::read_peaks() has been scaled by scale_amplitude() already. */ const double clip_level = _global_clip_level * fabs (req->image->props.amplitude); const Shape shape = req->image->props.shape; const bool logscaled = req->image->props.logscaled; if (req->image->props.shape == WaveView::Rectified) { /* each peak is a line from the bottom of the waveview * to a point determined by max (peaks[i].max, * peaks[i].min) */ if (logscaled) { for (int i = 0; i < n_peaks; ++i) { tips[i].bot = height - 1.0; const double p = alt_log_meter (fast_coefficient_to_dB (max (fabs (peaks[i].max), fabs (peaks[i].min)))); tips[i].top = y_extent (p, shape, height); tips[i].spread = p * height; if (peaks[i].max >= clip_level) { tips[i].clip_max = true; } if (-(peaks[i].min) >= clip_level) { tips[i].clip_min = true; } } } else { for (int i = 0; i < n_peaks; ++i) { tips[i].bot = height - 1.0; const double p = max(fabs (peaks[i].max), fabs (peaks[i].min)); tips[i].top = y_extent (p, shape, height); tips[i].spread = p * height; if (p >= clip_level) { tips[i].clip_max = true; } } } } else { const int y_span = 2 * floor ((height - 1) * .5); if (logscaled) { for (int i = 0; i < n_peaks; ++i) { PeakData p; p.max = peaks[i].max; p.min = peaks[i].min; if (peaks[i].max >= clip_level) { tips[i].clip_max = true; } if (-(peaks[i].min) >= clip_level) { tips[i].clip_min = true; } if (p.max > 0.0) { p.max = alt_log_meter (fast_coefficient_to_dB (p.max)); } else if (p.max < 0.0) { p.max =-alt_log_meter (fast_coefficient_to_dB (-p.max)); } else { p.max = 0.0; } if (p.min > 0.0) { p.min = alt_log_meter (fast_coefficient_to_dB (p.min)); } else if (p.min < 0.0) { p.min = -alt_log_meter (fast_coefficient_to_dB (-p.min)); } else { p.min = 0.0; } compute_tips (p, tips[i], y_span); tips[i].spread = tips[i].bot - tips[i].top; } } else { for (int i = 0; i < n_peaks; ++i) { if (peaks[i].max >= clip_level) { tips[i].clip_max = true; } if (-(peaks[i].min) >= clip_level) { tips[i].clip_min = true; } compute_tips (peaks[i], tips[i], y_span); tips[i].spread = tips[i].bot - tips[i].top; } } } if (req->stopped()) { return; } Color alpha_one = rgba_to_color (0, 0, 0, 1.0); set_source_rgba (wave_context, alpha_one); set_source_rgba (outline_context, alpha_one); set_source_rgba (clip_context, alpha_one); set_source_rgba (zero_context, alpha_one); /* ensure single-pixel lines */ wave_context->set_line_width (1.0); wave_context->set_line_cap (Cairo::LINE_CAP_BUTT); wave_context->set_line_join (Cairo::LINE_JOIN_ROUND); wave_context->translate (0.5, 0.5); outline_context->set_line_width (1.0); outline_context->set_line_cap (Cairo::LINE_CAP_ROUND); outline_context->translate (0.5, 0.5); clip_context->set_line_width (1.0); clip_context->translate (0.5, 0.5); zero_context->set_line_width (1.0); zero_context->translate (0.5, 0.5); /* the height of the clip-indicator should be at most 7 pixels, * or 5% of the height of the waveview item. */ const double clip_height = min (7.0, ceil (height * 0.05)); /* There are 3 possible components to draw at each x-axis position: the waveform "line", the zero line and an outline/clip indicator. We have to decide which of the 3 to draw at each position, pixel by pixel. This makes the rendering less efficient but it is the only way I can see to do this correctly. To avoid constant source swapping and stroking, we draw the components separately onto four alpha only image surfaces for use as a mask. With only 1 pixel of spread between the top and bottom of the line, we just draw the upper outline/clip indicator. With 2 pixels of spread, we draw the upper and lower outline clip indicators. With 3 pixels of spread we draw the upper and lower outline/clip indicators and at least 1 pixel of the waveform line. With 5 pixels of spread, we draw all components. We can do rectified as two separate passes because we have a much easier decision regarding whether to draw the waveform line. We always draw the clip/outline indicators. */ if (shape == WaveView::Rectified) { for (int i = 0; i < n_peaks; ++i) { /* waveform line */ if (tips[i].spread >= 1.0) { wave_context->move_to (i, tips[i].top); wave_context->line_to (i, tips[i].bot); } /* clip indicator */ if (_global_show_waveform_clipping && (tips[i].clip_max || tips[i].clip_min)) { clip_context->move_to (i, tips[i].top); /* clip-indicating upper terminal line */ clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + .5))); } else { outline_context->move_to (i, tips[i].top); outline_context->line_to (i, tips[i].top); } } wave_context->stroke (); clip_context->stroke (); outline_context->stroke (); } else { const int height_zero = floor ((height - 1) * .5); for (int i = 0; i < n_peaks; ++i) { bool connected_segment = false; /* https://lac.linuxaudio.org/2013/papers/36.pdf Fig3 */ if (i + 1 == n_peaks) { wave_context->move_to (i, tips[i].top); wave_context->line_to (i, tips[i].bot); } else if (tips[i].top >= tips[i + 1].bot) { connected_segment = true; wave_context->move_to (i - .5, tips[i].bot); wave_context->line_to (i + .5, tips[i + 1].bot); } else if (tips[i].bot <= tips[i + 1].top) { connected_segment = true; wave_context->move_to (i - .5, tips[i].top); wave_context->line_to (i + .5, tips[i + 1].top); } else { wave_context->move_to (i, tips[i].top); wave_context->line_to (i, tips[i].bot); } /* zero line, show only if there is enough spread or the waveform line does not cross zero line */ bool const show_zero_line = req->image->props.show_zero; if (show_zero_line && ((tips[i].spread >= 5.0) || (tips[i].top > height_zero ) || (tips[i].bot < height_zero)) ) { zero_context->move_to (i, height_zero); zero_context->rel_line_to (1.0, 0); } bool clipped = false; /* outline/clip indicators */ if (_global_show_waveform_clipping && tips[i].clip_max) { clip_context->move_to (i, tips[i].top); /* clip-indicating upper terminal line */ clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + 0.5))); clipped = true; } if (_global_show_waveform_clipping && tips[i].clip_min) { clip_context->move_to (i, tips[i].bot + 1); /* clip-indicating lower terminal line */ clip_context->rel_line_to (0, - min (clip_height, ceil(tips[i].spread + 0.5))); clipped = true; } if (!connected_segment && !clipped && tips[i].spread > 2.0) { /* only draw the outline if the spread * implies 3 or more pixels (so that we see 1 * white pixel in the middle). */ outline_context->move_to (i, tips[i].bot); outline_context->line_to (i, tips[i].bot); outline_context->move_to (i, tips[i].top); outline_context->line_to (i, tips[i].top); } } wave_context->stroke (); outline_context->stroke (); clip_context->stroke (); zero_context->stroke (); } if (req->stopped()) { return; } Cairo::RefPtr context = Cairo::Context::create (image); /* Here we set a source colour and use the various components as a mask. */ const Color fill_color = req->image->props.fill_color; const double gradient_depth = req->image->props.gradient_depth; if (gradient_depth != 0.0) { Cairo::RefPtr gradient (Cairo::LinearGradient::create (0, 0, 0, height)); double stops[3]; double r, g, b, a; if (shape == Rectified) { stops[0] = 0.1; stops[1] = 0.3; stops[2] = 0.9; } else { stops[0] = 0.1; stops[1] = 0.5; stops[2] = 0.9; } color_to_rgba (fill_color, r, g, b, a); gradient->add_color_stop_rgba (stops[1], r, g, b, a); /* generate a new color for the middle of the gradient */ double h, s, v; color_to_hsv (fill_color, h, s, v); /* change v towards white */ v *= 1.0 - gradient_depth; Color center = hsva_to_color (h, s, v, a); color_to_rgba (center, r, g, b, a); gradient->add_color_stop_rgba (stops[0], r, g, b, a); gradient->add_color_stop_rgba (stops[2], r, g, b, a); context->set_source (gradient); } else { set_source_rgba (context, fill_color); } if (req->stopped()) { return; } context->mask (images.wave, 0, 0); context->fill (); set_source_rgba (context, req->image->props.outline_color); context->mask (images.outline, 0, 0); context->fill (); set_source_rgba (context, req->image->props.clip_color); context->mask (images.clip, 0, 0); context->fill (); set_source_rgba (context, req->image->props.zero_color); context->mask (images.zero, 0, 0); context->fill (); } samplecnt_t WaveView::optimal_image_width_samples () const { /* Compute how wide the image should be in samples. * * The resulting image should be wider than the canvas width so that the * image does not have to be redrawn each time the canvas offset changes, but * drawing too much unnecessarily, for instance when zooming into the canvas * the part of the image that is outside of the visible canvas area may never * be displayed and will just increase apparent render time and reduce * responsiveness in non-threaded rendering and cause "flashing" waveforms in * threaded rendering mode. * * Another thing to consider is that if there are a number of waveforms on * the canvas that are the width of the canvas then we don't want to have to * draw the images for them all at once as it will cause a spike in render * time, or in threaded rendering mode it will mean all the draw requests will * the queued during the same sample/expose event. This issue can be * alleviated by using an element of randomness in selecting the image width. * * If the value of samples per pixel is less than 1/10th of a second, use * 1/10th of a second instead. */ samplecnt_t canvas_width_samples = _canvas->visible_area().width() * _props->samples_per_pixel; const samplecnt_t one_tenth_of_second = _region->session().sample_rate() / 10; /* If zoomed in where a canvas item interects with the canvas area but * stretches for many pages either side, to avoid having draw all images when * the canvas scrolls by a page width the multiplier would have to be a * randomized amount centered around 3 times the visible canvas width, but * for other operations like zooming or even with a stationary playhead it is * a lot of extra drawing that can affect performance. * * So without making things too complicated with different widths for * different operations, try to use a width that is a balance and will work * well for scrolling(non-page width) so all the images aren't redrawn at the * same time but also faster for sequential zooming operations. * * Canvas items that don't intersect with the edges of the visible canvas * will of course only draw images that are the pixel width of the item. * * It is a perhaps a coincidence that these values are centered roughly * around the golden ratio but they did work well in my testing. */ const double min_multiplier = 1.4; const double max_multiplier = 1.8; /** * A combination of high resolution screens, high samplerates and high * zoom levels(1 sample per pixel) can cause 1/10 of a second(in * pixels) to exceed the cairo image size limit. */ const double cairo_image_limit = 32767.0; const double max_image_width = cairo_image_limit / max_multiplier; samplecnt_t max_width_samples = floor (max_image_width / _props->samples_per_pixel); const samplecnt_t one_tenth_of_second_limited = std::min (one_tenth_of_second, max_width_samples); samplecnt_t new_sample_count = std::max (canvas_width_samples, one_tenth_of_second_limited); const double multiplier = g_random_double_range (min_multiplier, max_multiplier); return new_sample_count * multiplier; } void WaveView::set_image (std::shared_ptr img) const { get_cache_group ()->add_image (img); _image = img; } void WaveView::process_draw_request (std::shared_ptr req) { std::shared_ptr region = req->image->region.lock(); if (!region) { return; } if (req->stopped()) { return; } (void) Temporal::TempoMap::fetch(); WaveViewProperties const& props = req->image->props; const int n_peaks = props.get_width_pixels (); assert (n_peaks > 0 && n_peaks < 32767); std::unique_ptr peaks (new PeakData[n_peaks]); /* Note that Region::read_peaks() takes a start position based on an offset into the Region's **SOURCE**, rather than an offset into the Region itself. */ samplecnt_t peaks_read = region->read_peaks (peaks.get (), n_peaks, props.get_sample_start (), props.get_length_samples (), props.channel, props.samples_per_pixel); if (req->stopped()) { return; } Cairo::RefPtr cairo_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, req->image->props.height); // https://cairographics.org/manual/cairo-Image-Surfaces.html#cairo-image-surface-create // This function always returns a valid pointer, but it will return a pointer to a "nil" surface.. // but there's some evidence that req->image can be NULL. // https://tracker.ardour.org/view.php?id=6478 assert (cairo_image); if (peaks_read > 0) { /* region amplitude will have been used to generate the * peak values already, but not the visual-only * amplitude_above_axis. So apply that here before * rendering. */ const double amplitude_above_axis = props.amplitude_above_axis; if (amplitude_above_axis != 1.0) { for (samplecnt_t i = 0; i < n_peaks; ++i) { peaks[i].max *= amplitude_above_axis; peaks[i].min *= amplitude_above_axis; } } draw_image (cairo_image, peaks.get(), n_peaks, req); } else { draw_absent_image (cairo_image, peaks.get(), n_peaks); } if (req->stopped ()) { return; } // Assign now that we are sure all drawing is complete as that is what // determines whether a request was finished. req->image->cairo_image = cairo_image; } bool WaveView::draw_image_in_gui_thread () const { return _draw_image_in_gui_thread || _always_draw_image_in_gui_thread || !rendered () || !WaveViewThreads::enabled (); } void WaveView::render (Rect const & area, Cairo::RefPtr context) const { assert (_props->samples_per_pixel != 0); if (!_region) { // assert? return; } Rect draw; Rect self; if (!get_item_and_draw_rect_in_window_coords (area, self, draw)) { assert(false); return; } if (_props->height < 1) { if (_props->channel % 2) { return; } context->rectangle (draw.x0, draw.y0, draw.width (), draw.height ()); if (1 == (_props->channel % 3)) { set_source_rgba (context, _props->zero_color); } else { set_source_rgba (context, _props->fill_color); } context->fill (); return; } double const image_start_pixel_offset = draw.x0 - self.x0; double const image_end_pixel_offset = draw.x1 - self.x0; if (image_start_pixel_offset == image_end_pixel_offset) { // this may happen if zoomed very far out with a small region return; } WaveViewProperties required_props = *_props; required_props.set_sample_positions_from_pixel_offsets (image_start_pixel_offset, image_end_pixel_offset); assert (required_props.is_valid()); std::shared_ptr image_to_draw; if (current_request) { if (!current_request->image->props.is_equivalent (required_props)) { // The WaveView properties may have been updated during recording between // prepare_for_render and render calls and the new required props have // different end sample value. current_request->cancel (); current_request.reset (); } else if (current_request->finished ()) { image_to_draw = current_request->image; current_request.reset (); } } else { // No current Request } if (!image_to_draw && _image) { if (_image->props.is_equivalent (required_props)) { // Image contains required properties image_to_draw = _image; } else { // Image does not contain properties required } } if (!image_to_draw) { image_to_draw = get_cache_group ()->lookup_image (required_props); if (image_to_draw && !image_to_draw->finished ()) { // Found equivalent but unfinished Image in cache image_to_draw.reset (); } } if (!image_to_draw) { // No existing image to draw std::shared_ptr const request = create_draw_request (required_props); if (draw_image_in_gui_thread ()) { // now that we have to draw something, draw more than required. request->image->props.set_width_samples (optimal_image_width_samples ()); process_draw_request (request); image_to_draw = request->image; } else if (current_request) { if (current_request->finished ()) { // There is a chance the request is now finished since checking above image_to_draw = current_request->image; current_request.reset (); } else if (_canvas->get_microseconds_since_render_start () < 15000) { current_request->cancel (); current_request.reset (); // Drawing image in GUI thread as we have time // now that we have to draw something, draw more than required. request->image->props.set_width_samples (optimal_image_width_samples ()); process_draw_request (request); image_to_draw = request->image; } else { // Waiting for current request to finish redraw (); return; } } else { // Defer the rendering to another thread or perhaps render pass if // a thread cannot generate it in time. queue_draw_request (request); redraw (); return; } } /* reset this so that future missing images can be generated in a worker thread. */ _draw_image_in_gui_thread = false; assert (image_to_draw); /* Calculate the sample that corresponds to the region-rectangle's left edge * in the editor at current zoom (see TimeAxisViewItem::set_position). */ double const samples_per_pixel = _props->samples_per_pixel; samplepos_t const region_position = _region->position().samples(); samplepos_t const region_view_x = round (round (region_position / samples_per_pixel) * samples_per_pixel); ARDOUR::sampleoffset_t region_view_dx = region_position - region_view_x; /* compute the first pixel of the image that should be used when we * render the specified range. */ double image_origin_in_self_coordinates = (image_to_draw->props.get_sample_start () - _props->region_start + region_view_dx) / samples_per_pixel; /* the image may only be a best-effort ... it may not span the entire * range requested, though it is guaranteed to cover the start. So * determine how many pixels we can actually draw. */ const double draw_start_pixel = draw.x0; const double draw_end_pixel = draw.x1; double draw_width_pixels = draw_end_pixel - draw_start_pixel; if (image_to_draw != _image) { /* the image is guaranteed to start at or before * draw_start. But if it starts before draw_start, that reduces * the maximum available width we can render with. * * so .. clamp the draw width to the smaller of what we need to * draw or the available width of the image. */ draw_width_pixels = min ((double)image_to_draw->cairo_image->get_width (), draw_width_pixels); set_image (image_to_draw); } context->rectangle (draw_start_pixel, draw.y0, draw_width_pixels, draw.height()); /* round image origin position to an exact pixel in device space to * avoid blurring */ double x = self.x0 + image_origin_in_self_coordinates; double y = self.y0; context->user_to_device (x, y); x = floor (x); y = floor (y); context->device_to_user (x, y); /* the coordinates specify where in "user coordinates" (i.e. what we * generally call "canvas coordinates" in this code) the image origin * will appear. So specifying (10,10) will put the upper left corner of * the image at (10,10) in user space. */ context->set_source (image_to_draw->cairo_image, x, y); context->fill (); } void WaveView::compute_bounding_box () const { if (_region) { _bounding_box = Rect (0.0, 0.0, region_length() / _props->samples_per_pixel, _props->height); } else { _bounding_box = Rect (); } set_bbox_clean (); } void WaveView::set_height (Distance height) { if (_props->height != height) { begin_change (); _props->height = height; _draw_image_in_gui_thread = true; set_bbox_dirty (); end_change (); } } void WaveView::set_channel (int channel) { if (_props->channel != channel) { begin_change (); _props->channel = channel; reset_cache_group (); set_bbox_dirty (); end_change (); } } void WaveView::set_logscaled (bool yn) { if (_props->logscaled != yn) { begin_visual_change (); _props->logscaled = yn; end_visual_change (); } } void WaveView::set_gradient_depth (double) { // TODO ?? } double WaveView::gradient_depth () const { return _props->gradient_depth; } void WaveView::gain_changed () { begin_visual_change (); _props->amplitude = _region->scale_amplitude (); _draw_image_in_gui_thread = true; end_visual_change (); } void WaveView::set_zero_color (Color c) { if (_props->zero_color != c) { begin_visual_change (); _props->zero_color = c; end_visual_change (); } } void WaveView::set_clip_color (Color c) { if (_props->clip_color != c) { begin_visual_change (); _props->clip_color = c; end_visual_change (); } } void WaveView::set_show_zero_line (bool yn) { if (_props->show_zero != yn) { begin_visual_change (); _props->show_zero = yn; end_visual_change (); } } bool WaveView::show_zero_line () const { return _props->show_zero; } void WaveView::set_shape (Shape s) { if (_props->shape != s) { begin_visual_change (); _props->shape = s; end_visual_change (); } } void WaveView::set_amplitude_above_axis (double a) { if (fabs (_props->amplitude_above_axis - a) > 0.01) { begin_visual_change (); _props->amplitude_above_axis = a; _draw_image_in_gui_thread = true; end_visual_change (); } } double WaveView::amplitude_above_axis () const { return _props->amplitude_above_axis; } void WaveView::set_global_shape (Shape s) { if (_global_shape != s) { _global_shape = s; WaveViewCache::get_instance()->clear_cache (); VisualPropertiesChanged (); /* EMIT SIGNAL */ } } void WaveView::set_global_logscaled (bool yn) { if (_global_logscaled != yn) { _global_logscaled = yn; WaveViewCache::get_instance()->clear_cache (); VisualPropertiesChanged (); /* EMIT SIGNAL */ } } void WaveView::clear_cache () { WaveViewCache::get_instance()->clear_cache (); } samplecnt_t WaveView::region_length() const { return _region->length_samples() - (_props->region_start - _region->start_sample()); } samplepos_t WaveView::region_end() const { return _props->region_start + region_length(); } void WaveView::set_region_start (sampleoffset_t start) { if (!_region) { return; } if (_props->region_start == start) { return; } begin_change (); _props->region_start = start; set_bbox_dirty (); end_change (); } void WaveView::region_resized () { /* Called when the region start or end (thus length) has changed. */ if (!_region) { return; } begin_change (); _props->region_start = _region->start_sample(); _props->region_end = _region->start_sample() + _region->length_samples(); set_bbox_dirty (); end_change (); } void WaveView::set_global_gradient_depth (double depth) { if (_global_gradient_depth != depth) { _global_gradient_depth = depth; VisualPropertiesChanged (); /* EMIT SIGNAL */ } } void WaveView::set_global_show_waveform_clipping (bool yn) { if (_global_show_waveform_clipping != yn) { _global_show_waveform_clipping = yn; ClipLevelChanged (); } } void WaveView::set_start_shift (double pixels) { if (pixels < 0) { return; } begin_visual_change (); //_start_shift = pixels; end_visual_change (); } void WaveView::set_image_cache_size (uint64_t sz) { WaveViewCache::get_instance()->set_image_cache_threshold (sz); } std::shared_ptr WaveView::get_cache_group () const { if (_cache_group) { return _cache_group; } std::shared_ptr source = _region->audio_source (_props->channel); assert (source); _cache_group = WaveViewCache::get_instance ()->get_cache_group (source); return _cache_group; } void WaveView::reset_cache_group () { WaveViewCache::get_instance()->reset_cache_group (_cache_group); }