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39
40 #include "qqnxglobal.h"
41
42 #include "qqnxrasterwindow.h"
43 #include "qqnxscreen.h"
44
45 #include <QDebug>
46
47 #include <errno.h>
48
49 #if defined(QQNXRASTERWINDOW_DEBUG)
50 #define qRasterWindowDebug qDebug
51 #else
52 #define qRasterWindowDebug QT_NO_QDEBUG_MACRO
53 #endif
54
55 QT_BEGIN_NAMESPACE
56
QQnxRasterWindow(QWindow * window,screen_context_t context,bool needRootWindow)57 QQnxRasterWindow::QQnxRasterWindow(QWindow *window, screen_context_t context, bool needRootWindow) :
58 QQnxWindow(window, context, needRootWindow),
59 m_currentBufferIndex(-1),
60 m_previousBufferIndex(-1)
61 {
62 initWindow();
63
64 // Set window usage
65 if (window->type() == Qt::Desktop)
66 return;
67
68 const int val = SCREEN_USAGE_NATIVE | SCREEN_USAGE_READ | SCREEN_USAGE_WRITE;
69 const int result = screen_set_window_property_iv(nativeHandle(), SCREEN_PROPERTY_USAGE, &val);
70 if (Q_UNLIKELY(result != 0))
71 qFatal("QQnxRasterWindow: failed to set window alpha usage, errno=%d", errno);
72 }
73
post(const QRegion & dirty)74 void QQnxRasterWindow::post(const QRegion &dirty)
75 {
76 // How double-buffering works
77 // --------------------------
78 //
79 // The are two buffers, the previous one and the current one.
80 // The previous buffer always contains the complete, full image of the whole window when it
81 // was last posted.
82 // The current buffer starts with the complete, full image of the second to last posting
83 // of the window.
84 //
85 // During painting, Qt paints on the current buffer. Thus, when Qt has finished painting, the
86 // current buffer contains the second to last image plus the newly painted regions.
87 // Since the second to last image is too old, we copy over the image from the previous buffer, but
88 // only for those regions that Qt didn't paint (because that would overwrite what Qt has just
89 // painted). This is the copyPreviousToCurrent() call below.
90 //
91 // After the call to copyPreviousToCurrent(), the current buffer contains the complete, full image of the
92 // whole window in its current state, and we call screen_post_window() to make the new buffer
93 // available to libscreen (called "posting"). There, only the regions that Qt painted on are
94 // posted, as nothing else has changed.
95 //
96 // After that, the previous and the current buffers are swapped, and the whole cycle starts anew.
97
98 // Check if render buffer exists and something was rendered
99 if (m_currentBufferIndex != -1 && !dirty.isEmpty()) {
100 qRasterWindowDebug() << "window =" << window();
101 QQnxBuffer ¤tBuffer = m_buffers[m_currentBufferIndex];
102
103 // Copy unmodified region from old render buffer to new render buffer;
104 // required to allow partial updates
105 QRegion preserve = m_previousDirty - dirty - m_scrolled;
106 blitPreviousToCurrent(preserve, 0, 0);
107
108 // Calculate region that changed
109 QRegion modified = preserve + dirty + m_scrolled;
110 QRect rect = modified.boundingRect();
111 int dirtyRect[4] = { rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height() };
112
113 // Update the display with contents of render buffer
114 Q_SCREEN_CHECKERROR(
115 screen_post_window(nativeHandle(), currentBuffer.nativeBuffer(), 1, dirtyRect, 0),
116 "Failed to post window");
117
118 // Advance to next nender buffer
119 m_previousBufferIndex = m_currentBufferIndex++;
120 if (m_currentBufferIndex >= MAX_BUFFER_COUNT)
121 m_currentBufferIndex = 0;
122
123 // Save modified region and clear scrolled region
124 m_previousDirty = dirty;
125 m_scrolled = QRegion();
126
127 windowPosted();
128 }
129 }
130
scroll(const QRegion & region,int dx,int dy,bool flush)131 void QQnxRasterWindow::scroll(const QRegion ®ion, int dx, int dy, bool flush)
132 {
133 qRasterWindowDebug() << "window =" << window();
134 blitPreviousToCurrent(region, dx, dy, flush);
135 m_scrolled += region;
136 }
137
renderBuffer()138 QQnxBuffer &QQnxRasterWindow::renderBuffer()
139 {
140 qRasterWindowDebug() << "window =" << window();
141
142 // Check if render buffer is invalid
143 if (m_currentBufferIndex == -1) {
144 auto platformScreen = static_cast<QQnxScreen *>(screen());
145 // Get all buffers available for rendering
146 screen_buffer_t buffers[MAX_BUFFER_COUNT];
147 const int result = screen_get_window_property_pv(nativeHandle(), SCREEN_PROPERTY_RENDER_BUFFERS,
148 (void **)buffers);
149 Q_SCREEN_CRITICALERROR(result, "Failed to query window buffers");
150
151 // Wrap each buffer and clear
152 for (int i = 0; i < MAX_BUFFER_COUNT; ++i) {
153 m_buffers[i] = QQnxBuffer(buffers[i]);
154
155 // Clear Buffer
156 int bg[] = { SCREEN_BLIT_COLOR, 0x00000000, SCREEN_BLIT_END };
157 Q_SCREEN_CHECKERROR(screen_fill(platformScreen->nativeContext(), buffers[i], bg),
158 "Failed to clear window buffer");
159 }
160
161 Q_SCREEN_CHECKERROR(screen_flush_blits(platformScreen->nativeContext(), SCREEN_WAIT_IDLE),
162 "Failed to flush blits");
163
164 // Use the first available render buffer
165 m_currentBufferIndex = 0;
166 m_previousBufferIndex = -1;
167 }
168
169 return m_buffers[m_currentBufferIndex];
170 }
171
setParent(const QPlatformWindow * wnd)172 void QQnxRasterWindow::setParent(const QPlatformWindow *wnd)
173 {
174 QQnxWindow::setParent(wnd);
175 adjustBufferSize();
176 }
177
adjustBufferSize()178 void QQnxRasterWindow::adjustBufferSize()
179 {
180 // When having a raster window we don't need any buffers, since
181 // Qt will draw to the parent TLW backing store.
182 const QSize windowSize = window()->parent() ? QSize(0,0) : window()->size();
183 if (windowSize != bufferSize())
184 setBufferSize(windowSize);
185 }
186
pixelFormat() const187 int QQnxRasterWindow::pixelFormat() const
188 {
189 return static_cast<QQnxScreen *>(screen())->nativeFormat();
190 }
191
resetBuffers()192 void QQnxRasterWindow::resetBuffers()
193 {
194 // Buffers were destroyed; reacquire them
195 m_currentBufferIndex = -1;
196 m_previousDirty = QRegion();
197 m_scrolled = QRegion();
198 if (window()->parent() && bufferSize() == QSize(1,1)) {
199 // If we have a parent then we're not really rendering. But if we don't render we'll
200 // be invisible and any children won't show up. This should be harmless since we're
201 // rendering into a 1x1 window that has transparency set to discard.
202 renderBuffer();
203 post(QRegion(0,0,1,1));
204 }
205 }
206
blitPreviousToCurrent(const QRegion & region,int dx,int dy,bool flush)207 void QQnxRasterWindow::blitPreviousToCurrent(const QRegion ®ion, int dx, int dy, bool flush)
208 {
209 qRasterWindowDebug() << "window =" << window();
210
211 // Abort if previous buffer is invalid or if nothing to copy
212 if (m_previousBufferIndex == -1 || region.isEmpty())
213 return;
214
215 QQnxBuffer ¤tBuffer = m_buffers[m_currentBufferIndex];
216 QQnxBuffer &previousBuffer = m_buffers[m_previousBufferIndex];
217
218 // Break down region into non-overlapping rectangles
219 for (auto rit = region.rbegin(), rend = region.rend(); rit != rend; ++rit) {
220 // Clip rectangle to bounds of target
221 const QRect rect = rit->intersected(currentBuffer.rect());
222
223 if (rect.isEmpty())
224 continue;
225
226 // Setup blit operation
227 int attribs[] = { SCREEN_BLIT_SOURCE_X, rect.x(),
228 SCREEN_BLIT_SOURCE_Y, rect.y(),
229 SCREEN_BLIT_SOURCE_WIDTH, rect.width(),
230 SCREEN_BLIT_SOURCE_HEIGHT, rect.height(),
231 SCREEN_BLIT_DESTINATION_X, rect.x() + dx,
232 SCREEN_BLIT_DESTINATION_Y, rect.y() + dy,
233 SCREEN_BLIT_DESTINATION_WIDTH, rect.width(),
234 SCREEN_BLIT_DESTINATION_HEIGHT, rect.height(),
235 SCREEN_BLIT_END };
236
237 // Queue blit operation
238 Q_SCREEN_CHECKERROR(screen_blit(m_screenContext, currentBuffer.nativeBuffer(),
239 previousBuffer.nativeBuffer(), attribs),
240 "Failed to blit buffers");
241 }
242
243 // Check if flush requested
244 if (flush) {
245 // Wait for all blits to complete
246 Q_SCREEN_CHECKERROR(screen_flush_blits(m_screenContext, SCREEN_WAIT_IDLE),
247 "Failed to flush blits");
248
249 // Buffer was modified outside the CPU
250 currentBuffer.invalidateInCache();
251 }
252 }
253
254 QT_END_NAMESPACE
255