Telltales: Rendering Safety-Critical UI

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#include "qnxwindow.h" RasterWindow::RasterWindow(const QSafeSize &size) :AbstractWindow(size) ,m_buffer(size.width(), size.height(), SCREEN_FORMAT_RGBA8888, &m_screen_ctx) ,m_size(size) { int rect[4] = { 0, 0, (int)size.width(), (int)size.height() }; screen_create_window(&m_window, m_screen_ctx); int pipeline = 2; screen_set_window_property_iv(m_window, SCREEN_PROPERTY_PIPELINE, &pipeline); int usage = SCREEN_USAGE_OVERLAY; screen_set_window_property_iv(m_window, SCREEN_PROPERTY_USAGE, &usage); int format = SCREEN_FORMAT_RGBA8888; screen_set_window_property_iv(m_window, SCREEN_PROPERTY_FORMAT, &format); screen_create_window_buffers(m_window, 1); screen_get_window_property_iv(m_window, SCREEN_PROPERTY_BUFFER_SIZE, rect+2); } void RasterWindow::render(const Rect &dirtyArea) { screen_buffer_t screen_buf[2]; qint32 rect[4] = { static_cast<qint32>(dirtyArea.x), static_cast<qint32>(dirtyArea.y), static_cast<qint32>(dirtyArea.width), static_cast<qint32>(dirtyArea.height) }; screen_get_window_property_pv(m_window, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)screen_buf); int hg[] = { SCREEN_BLIT_SOURCE_WIDTH, (int)m_size.width(), SCREEN_BLIT_SOURCE_HEIGHT, (int)m_size.height(), SCREEN_BLIT_DESTINATION_X, 0, SCREEN_BLIT_DESTINATION_Y, 0, SCREEN_BLIT_DESTINATION_WIDTH, (int)m_size.width(), SCREEN_BLIT_DESTINATION_HEIGHT, (int)m_size.height(), SCREEN_BLIT_TRANSPARENCY, SCREEN_TRANSPARENCY_SOURCE, SCREEN_BLIT_END }; screen_blit(m_screen_ctx, screen_buf[0], m_buffer.buffer(), hg); screen_flush_blits(m_screen_ctx, SCREEN_WAIT_IDLE); screen_post_window(m_window, screen_buf[0], 1, rect, 0); }