| /* |
| * Copyright (C) 2011,2014 Igalia S.L. |
| * Copyright (C) 2011 Samsung Electronics |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "config.h" |
| #include "BackingStoreBackendCairoImpl.h" |
| |
| #if USE(CAIRO) |
| |
| #include "CairoUtilities.h" |
| |
| namespace WebCore { |
| |
| static const Seconds scrollHysteresisDuration { 300_ms }; |
| |
| static RefPtr<cairo_surface_t> createCairoImageSurfaceWithFastMalloc(const IntSize& size, double deviceScaleFactor) |
| { |
| static cairo_user_data_key_t s_surfaceDataKey; |
| int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, size.width()); |
| auto* surfaceData = fastZeroedMalloc(size.height() * stride); |
| RefPtr<cairo_surface_t> surface = adoptRef(cairo_image_surface_create_for_data(static_cast<unsigned char*>(surfaceData), CAIRO_FORMAT_ARGB32, size.width(), size.height(), stride)); |
| cairo_surface_set_user_data(surface.get(), &s_surfaceDataKey, surfaceData, [](void* data) { fastFree(data); }); |
| cairoSurfaceSetDeviceScale(surface.get(), deviceScaleFactor, deviceScaleFactor); |
| return surface; |
| } |
| |
| BackingStoreBackendCairoImpl::BackingStoreBackendCairoImpl(const IntSize& size, float deviceScaleFactor) |
| : BackingStoreBackendCairo(size) |
| , m_scrolledHysteresis([this](PAL::HysteresisState state) { if (state == PAL::HysteresisState::Stopped) m_scrollSurface = nullptr; }, scrollHysteresisDuration) |
| { |
| IntSize scaledSize = m_size; |
| scaledSize.scale(deviceScaleFactor); |
| m_surface = createCairoImageSurfaceWithFastMalloc(scaledSize, deviceScaleFactor); |
| } |
| |
| BackingStoreBackendCairoImpl::~BackingStoreBackendCairoImpl() = default; |
| |
| void BackingStoreBackendCairoImpl::scroll(const IntRect& scrollRect, const IntSize& scrollOffset) |
| { |
| IntRect targetRect = scrollRect; |
| targetRect.move(scrollOffset); |
| targetRect.intersect(scrollRect); |
| if (targetRect.isEmpty()) |
| return; |
| |
| if (!m_scrollSurface) { |
| IntSize size(cairo_image_surface_get_width(m_surface.get()), cairo_image_surface_get_height(m_surface.get())); |
| double xScale, yScale; |
| cairoSurfaceGetDeviceScale(m_surface.get(), xScale, yScale); |
| ASSERT(xScale == yScale); |
| m_scrollSurface = createCairoImageSurfaceWithFastMalloc(size, xScale); |
| } |
| copyRectFromOneSurfaceToAnother(m_surface.get(), m_scrollSurface.get(), scrollOffset, targetRect); |
| copyRectFromOneSurfaceToAnother(m_scrollSurface.get(), m_surface.get(), IntSize(), targetRect); |
| |
| m_scrolledHysteresis.impulse(); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // USE(CAIRO) |