| /* |
| * Copyright (C) 2011 Igalia S.L. |
| * Copyright (c) 2008, Google Inc. All rights reserved. |
| * Copyright (c) 2012, Intel Corporation |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "PlatformContextCairo.h" |
| |
| #if USE(CAIRO) |
| |
| #include <cairo.h> |
| |
| namespace WebCore { |
| |
| // Encapsulates the additional painting state information we store for each |
| // pushed graphics state. |
| class PlatformContextCairo::State { |
| public: |
| State() = default; |
| |
| struct { |
| RefPtr<cairo_pattern_t> pattern; |
| cairo_matrix_t matrix; |
| } m_mask; |
| }; |
| |
| PlatformContextCairo::PlatformContextCairo(cairo_t* cr) |
| : m_cr(cr) |
| { |
| m_stateStack.append(State()); |
| m_state = &m_stateStack.last(); |
| } |
| |
| void PlatformContextCairo::restore() |
| { |
| if (m_state->m_mask.pattern) { |
| cairo_pop_group_to_source(m_cr.get()); |
| |
| cairo_matrix_t matrix; |
| cairo_get_matrix(m_cr.get(), &matrix); |
| cairo_set_matrix(m_cr.get(), &m_state->m_mask.matrix); |
| cairo_mask(m_cr.get(), m_state->m_mask.pattern.get()); |
| cairo_set_matrix(m_cr.get(), &matrix); |
| } |
| |
| m_stateStack.removeLast(); |
| ASSERT(!m_stateStack.isEmpty()); |
| m_state = &m_stateStack.last(); |
| |
| cairo_restore(m_cr.get()); |
| } |
| |
| PlatformContextCairo::~PlatformContextCairo() = default; |
| |
| void PlatformContextCairo::save() |
| { |
| m_stateStack.append(State()); |
| m_state = &m_stateStack.last(); |
| |
| cairo_save(m_cr.get()); |
| } |
| |
| void PlatformContextCairo::pushImageMask(cairo_surface_t* surface, const FloatRect& rect) |
| { |
| // We must call savePlatformState at least once before we can use image masking, |
| // since we actually apply the mask in restorePlatformState. |
| ASSERT(!m_stateStack.isEmpty()); |
| m_state->m_mask.pattern = adoptRef(cairo_pattern_create_for_surface(surface)); |
| cairo_get_matrix(m_cr.get(), &m_state->m_mask.matrix); |
| |
| cairo_matrix_t matrix; |
| cairo_matrix_init_translate(&matrix, -rect.x(), -rect.y()); |
| cairo_pattern_set_matrix(m_state->m_mask.pattern.get(), &matrix); |
| |
| cairo_push_group(m_cr.get()); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // USE(CAIRO) |