michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifdef _MSC_VER
michael@0: #define _USE_MATH_DEFINES
michael@0: #endif
michael@0: #include <math.h>
michael@0: 
michael@0: #include "mozilla/Alignment.h"
michael@0: 
michael@0: #include "cairo.h"
michael@0: 
michael@0: #include "gfxContext.h"
michael@0: 
michael@0: #include "gfxColor.h"
michael@0: #include "gfxMatrix.h"
michael@0: #include "gfxASurface.h"
michael@0: #include "gfxPattern.h"
michael@0: #include "gfxPlatform.h"
michael@0: #include "gfxTeeSurface.h"
michael@0: #include "GeckoProfiler.h"
michael@0: #include "gfx2DGlue.h"
michael@0: #include "mozilla/gfx/PathHelpers.h"
michael@0: #include <algorithm>
michael@0: 
michael@0: #if CAIRO_HAS_DWRITE_FONT
michael@0: #include "gfxWindowsPlatform.h"
michael@0: #endif
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::gfx;
michael@0: 
michael@0: UserDataKey gfxContext::sDontUseAsSourceKey;
michael@0: 
michael@0: /* This class lives on the stack and allows gfxContext users to easily, and
michael@0:  * performantly get a gfx::Pattern to use for drawing in their current context.
michael@0:  */
michael@0: class GeneralPattern
michael@0: {
michael@0: public:    
michael@0:   GeneralPattern(gfxContext *aContext) : mContext(aContext), mPattern(nullptr) {}
michael@0:   ~GeneralPattern() { if (mPattern) { mPattern->~Pattern(); } }
michael@0: 
michael@0:   operator mozilla::gfx::Pattern&()
michael@0:   {
michael@0:     gfxContext::AzureState &state = mContext->CurrentState();
michael@0: 
michael@0:     if (state.pattern) {
michael@0:       return *state.pattern->GetPattern(mContext->mDT, state.patternTransformChanged ? &state.patternTransform : nullptr);
michael@0:     } else if (state.sourceSurface) {
michael@0:       Matrix transform = state.surfTransform;
michael@0: 
michael@0:       if (state.patternTransformChanged) {
michael@0:         Matrix mat = mContext->GetDTTransform();
michael@0:         mat.Invert();
michael@0: 
michael@0:         transform = transform * state.patternTransform * mat;
michael@0:       }
michael@0: 
michael@0:       mPattern = new (mSurfacePattern.addr())
michael@0:         SurfacePattern(state.sourceSurface, ExtendMode::CLAMP, transform);
michael@0:       return *mPattern;
michael@0:     } else {
michael@0:       mPattern = new (mColorPattern.addr())
michael@0:         ColorPattern(state.color);
michael@0:       return *mPattern;
michael@0:     }
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   union {
michael@0:     mozilla::AlignedStorage2<mozilla::gfx::ColorPattern> mColorPattern;
michael@0:     mozilla::AlignedStorage2<mozilla::gfx::SurfacePattern> mSurfacePattern;
michael@0:   };
michael@0: 
michael@0:   gfxContext *mContext;
michael@0:   Pattern *mPattern;
michael@0: };
michael@0: 
michael@0: gfxContext::gfxContext(gfxASurface *surface)
michael@0:   : mRefCairo(nullptr)
michael@0:   , mSurface(surface)
michael@0: {
michael@0:   MOZ_COUNT_CTOR(gfxContext);
michael@0: 
michael@0:   mCairo = cairo_create(surface->CairoSurface());
michael@0:   mFlags = surface->GetDefaultContextFlags();
michael@0:   if (mSurface->GetRotateForLandscape()) {
michael@0:     // Rotate page 90 degrees to draw landscape page on portrait paper
michael@0:     gfxIntSize size = mSurface->GetSize();
michael@0:     Translate(gfxPoint(0, size.width));
michael@0:     gfxMatrix matrix(0, -1,
michael@0:                       1,  0,
michael@0:                       0,  0);
michael@0:     Multiply(matrix);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::gfxContext(DrawTarget *aTarget, const Point& aDeviceOffset)
michael@0:   : mPathIsRect(false)
michael@0:   , mTransformChanged(false)
michael@0:   , mCairo(nullptr)
michael@0:   , mRefCairo(nullptr)
michael@0:   , mSurface(nullptr)
michael@0:   , mFlags(0)
michael@0:   , mDT(aTarget)
michael@0:   , mOriginalDT(aTarget)
michael@0: {
michael@0:   MOZ_COUNT_CTOR(gfxContext);
michael@0: 
michael@0:   mStateStack.SetLength(1);
michael@0:   CurrentState().drawTarget = mDT;
michael@0:   CurrentState().deviceOffset = aDeviceOffset;
michael@0:   mDT->SetTransform(Matrix());
michael@0: }
michael@0: 
michael@0: /* static */ already_AddRefed<gfxContext>
michael@0: gfxContext::ContextForDrawTarget(DrawTarget* aTarget)
michael@0: {
michael@0:   Matrix transform = aTarget->GetTransform();
michael@0:   nsRefPtr<gfxContext> result = new gfxContext(aTarget);
michael@0:   result->SetMatrix(ThebesMatrix(transform));
michael@0:   return result.forget();
michael@0: }
michael@0: 
michael@0: gfxContext::~gfxContext()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_destroy(mCairo);
michael@0:   }
michael@0:   if (mRefCairo) {
michael@0:     cairo_destroy(mRefCairo);
michael@0:   }
michael@0:   if (mDT) {
michael@0:     for (int i = mStateStack.Length() - 1; i >= 0; i--) {
michael@0:       for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
michael@0:         mDT->PopClip();
michael@0:       }
michael@0: 
michael@0:       if (mStateStack[i].clipWasReset) {
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0:     mDT->Flush();
michael@0:   }
michael@0:   MOZ_COUNT_DTOR(gfxContext);
michael@0: }
michael@0: 
michael@0: gfxASurface *
michael@0: gfxContext::OriginalSurface()
michael@0: {
michael@0:     if (mCairo || mSurface) {
michael@0:         return mSurface;
michael@0:     }
michael@0: 
michael@0:     if (mOriginalDT && mOriginalDT->GetType() == BackendType::CAIRO) {
michael@0:         cairo_surface_t *s =
michael@0:             (cairo_surface_t*)mOriginalDT->GetNativeSurface(NativeSurfaceType::CAIRO_SURFACE);
michael@0:         if (s) {
michael@0:             mSurface = gfxASurface::Wrap(s);
michael@0:             return mSurface;
michael@0:         }
michael@0:     }
michael@0:     return nullptr;
michael@0: }
michael@0: 
michael@0: already_AddRefed<gfxASurface>
michael@0: gfxContext::CurrentSurface(gfxFloat *dx, gfxFloat *dy)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_surface_t *s = cairo_get_group_target(mCairo);
michael@0:     if (s == mSurface->CairoSurface()) {
michael@0:         if (dx && dy)
michael@0:             cairo_surface_get_device_offset(s, dx, dy);
michael@0:         nsRefPtr<gfxASurface> ret = mSurface;
michael@0:         return ret.forget();
michael@0:     }
michael@0: 
michael@0:     if (dx && dy)
michael@0:         cairo_surface_get_device_offset(s, dx, dy);
michael@0:     return gfxASurface::Wrap(s);
michael@0:   } else {
michael@0:     if (mDT->GetType() == BackendType::CAIRO) {
michael@0:         cairo_surface_t *s =
michael@0:             (cairo_surface_t*)mDT->GetNativeSurface(NativeSurfaceType::CAIRO_SURFACE);
michael@0:         if (s) {
michael@0:             if (dx && dy) {
michael@0:                 *dx = -CurrentState().deviceOffset.x;
michael@0:                 *dy = -CurrentState().deviceOffset.y;
michael@0:             }
michael@0:             return gfxASurface::Wrap(s);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (dx && dy) {
michael@0:       *dx = *dy = 0;
michael@0:     }
michael@0:     // An Azure context doesn't have a surface backing it.
michael@0:     return nullptr;
michael@0:   }
michael@0: }
michael@0: 
michael@0: cairo_t *
michael@0: gfxContext::GetCairo()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return mCairo;
michael@0:   }
michael@0: 
michael@0:   if (mDT->GetType() == BackendType::CAIRO) {
michael@0:     cairo_t *ctx =
michael@0:       (cairo_t*)mDT->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT);
michael@0:     if (ctx) {
michael@0:       return ctx;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (mRefCairo) {
michael@0:     // Set transform!
michael@0:     return mRefCairo;
michael@0:   }
michael@0: 
michael@0:   mRefCairo = cairo_create(gfxPlatform::GetPlatform()->ScreenReferenceSurface()->CairoSurface()); 
michael@0: 
michael@0:   return mRefCairo;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Save()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_save(mCairo);
michael@0:   } else {
michael@0:     CurrentState().transform = mTransform;
michael@0:     mStateStack.AppendElement(AzureState(CurrentState()));
michael@0:     CurrentState().clipWasReset = false;
michael@0:     CurrentState().pushedClips.Clear();
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Restore()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_restore(mCairo);
michael@0:   } else {
michael@0:     for (unsigned int c = 0; c < CurrentState().pushedClips.Length(); c++) {
michael@0:       mDT->PopClip();
michael@0:     }
michael@0: 
michael@0:     if (CurrentState().clipWasReset &&
michael@0:         CurrentState().drawTarget == mStateStack[mStateStack.Length() - 2].drawTarget) {
michael@0:       PushClipsToDT(mDT);
michael@0:     }
michael@0: 
michael@0:     mStateStack.RemoveElementAt(mStateStack.Length() - 1);
michael@0: 
michael@0:     mDT = CurrentState().drawTarget;
michael@0: 
michael@0:     ChangeTransform(CurrentState().transform, false);
michael@0:   }
michael@0: }
michael@0: 
michael@0: // drawing
michael@0: void
michael@0: gfxContext::NewPath()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_new_path(mCairo);
michael@0:   } else {
michael@0:     mPath = nullptr;
michael@0:     mPathBuilder = nullptr;
michael@0:     mPathIsRect = false;
michael@0:     mTransformChanged = false;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::ClosePath()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_close_path(mCairo);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->Close();
michael@0:   }
michael@0: }
michael@0: 
michael@0: already_AddRefed<gfxPath> gfxContext::CopyPath()
michael@0: {
michael@0:   nsRefPtr<gfxPath> path;
michael@0:   if (mCairo) {
michael@0:     path = new gfxPath(cairo_copy_path(mCairo));
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     path = new gfxPath(mPath);
michael@0:   }
michael@0:   return path.forget();
michael@0: }
michael@0: 
michael@0: void gfxContext::SetPath(gfxPath* path)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_new_path(mCairo);
michael@0:     if (path->mPath->status == CAIRO_STATUS_SUCCESS && path->mPath->num_data != 0)
michael@0:         cairo_append_path(mCairo, path->mPath);
michael@0:   } else {
michael@0:     MOZ_ASSERT(path->mMoz2DPath, "Can't mix cairo and azure paths!");
michael@0:     MOZ_ASSERT(path->mMoz2DPath->GetBackendType() == mDT->GetType());
michael@0:     mPath = path->mMoz2DPath;
michael@0:     mPathBuilder = nullptr;
michael@0:     mPathIsRect = false;
michael@0:     mTransformChanged = false;
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxPoint
michael@0: gfxContext::CurrentPoint()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double x, y;
michael@0:     cairo_get_current_point(mCairo, &x, &y);
michael@0:     return gfxPoint(x, y);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     return ThebesPoint(mPathBuilder->CurrentPoint());
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Stroke()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_stroke_preserve(mCairo);
michael@0:   } else {
michael@0:     AzureState &state = CurrentState();
michael@0:     if (mPathIsRect) {
michael@0:       MOZ_ASSERT(!mTransformChanged);
michael@0: 
michael@0:       mDT->StrokeRect(mRect, GeneralPattern(this),
michael@0:                       state.strokeOptions,
michael@0:                       DrawOptions(1.0f, GetOp(), state.aaMode));
michael@0:     } else {
michael@0:       EnsurePath();
michael@0: 
michael@0:       mDT->Stroke(mPath, GeneralPattern(this), state.strokeOptions,
michael@0:                   DrawOptions(1.0f, GetOp(), state.aaMode));
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Fill()
michael@0: {
michael@0:   PROFILER_LABEL("gfxContext", "Fill");
michael@0:   if (mCairo) {
michael@0:     cairo_fill_preserve(mCairo);
michael@0:   } else {
michael@0:     FillAzure(1.0f);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::FillWithOpacity(gfxFloat aOpacity)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     // This method exists in the hope that one day cairo gets a direct
michael@0:     // API for this, and then we would change this method to use that
michael@0:     // API instead.
michael@0:     if (aOpacity != 1.0) {
michael@0:       gfxContextAutoSaveRestore saveRestore(this);
michael@0:       Clip();
michael@0:       Paint(aOpacity);
michael@0:     } else {
michael@0:       Fill();
michael@0:     }
michael@0:   } else {
michael@0:     FillAzure(Float(aOpacity));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::MoveTo(const gfxPoint& pt)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_move_to(mCairo, pt.x, pt.y);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->MoveTo(ToPoint(pt));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::NewSubPath()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_new_sub_path(mCairo);
michael@0:   } else {
michael@0:     // XXX - This has no users, we should kill it, it should be equivelant to a
michael@0:     // MoveTo to the path's current point.
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::LineTo(const gfxPoint& pt)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_line_to(mCairo, pt.x, pt.y);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->LineTo(ToPoint(pt));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::CurveTo(const gfxPoint& pt1, const gfxPoint& pt2, const gfxPoint& pt3)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_curve_to(mCairo, pt1.x, pt1.y, pt2.x, pt2.y, pt3.x, pt3.y);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->BezierTo(ToPoint(pt1), ToPoint(pt2), ToPoint(pt3));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::QuadraticCurveTo(const gfxPoint& pt1, const gfxPoint& pt2)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double cx, cy;
michael@0:     cairo_get_current_point(mCairo, &cx, &cy);
michael@0:     cairo_curve_to(mCairo,
michael@0:                    (cx + pt1.x * 2.0) / 3.0,
michael@0:                    (cy + pt1.y * 2.0) / 3.0,
michael@0:                    (pt1.x * 2.0 + pt2.x) / 3.0,
michael@0:                    (pt1.y * 2.0 + pt2.y) / 3.0,
michael@0:                    pt2.x,
michael@0:                    pt2.y);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->QuadraticBezierTo(ToPoint(pt1), ToPoint(pt2));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Arc(const gfxPoint& center, gfxFloat radius,
michael@0:                 gfxFloat angle1, gfxFloat angle2)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_arc(mCairo, center.x, center.y, radius, angle1, angle2);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->Arc(ToPoint(center), Float(radius), Float(angle1), Float(angle2));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::NegativeArc(const gfxPoint& center, gfxFloat radius,
michael@0:                         gfxFloat angle1, gfxFloat angle2)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_arc_negative(mCairo, center.x, center.y, radius, angle1, angle2);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->Arc(ToPoint(center), Float(radius), Float(angle2), Float(angle1));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Line(const gfxPoint& start, const gfxPoint& end)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     MoveTo(start);
michael@0:     LineTo(end);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     mPathBuilder->MoveTo(ToPoint(start));
michael@0:     mPathBuilder->LineTo(ToPoint(end));
michael@0:   }
michael@0: }
michael@0: 
michael@0: // XXX snapToPixels is only valid when snapping for filled
michael@0: // rectangles and for even-width stroked rectangles.
michael@0: // For odd-width stroked rectangles, we need to offset x/y by
michael@0: // 0.5...
michael@0: void
michael@0: gfxContext::Rectangle(const gfxRect& rect, bool snapToPixels)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (snapToPixels) {
michael@0:         gfxRect snappedRect(rect);
michael@0: 
michael@0:         if (UserToDevicePixelSnapped(snappedRect, true))
michael@0:         {
michael@0:             cairo_matrix_t mat;
michael@0:             cairo_get_matrix(mCairo, &mat);
michael@0:             cairo_identity_matrix(mCairo);
michael@0:             Rectangle(snappedRect);
michael@0:             cairo_set_matrix(mCairo, &mat);
michael@0: 
michael@0:             return;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     cairo_rectangle(mCairo, rect.X(), rect.Y(), rect.Width(), rect.Height());
michael@0:   } else {
michael@0:     Rect rec = ToRect(rect);
michael@0: 
michael@0:     if (snapToPixels) {
michael@0:       gfxRect newRect(rect);
michael@0:       if (UserToDevicePixelSnapped(newRect, true)) {
michael@0:         gfxMatrix mat = ThebesMatrix(mTransform);
michael@0:         mat.Invert();
michael@0: 
michael@0:         // We need the user space rect.
michael@0:         rec = ToRect(mat.TransformBounds(newRect));
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (!mPathBuilder && !mPathIsRect) {
michael@0:       mPathIsRect = true;
michael@0:       mRect = rec;
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     EnsurePathBuilder();
michael@0: 
michael@0:     mPathBuilder->MoveTo(rec.TopLeft());
michael@0:     mPathBuilder->LineTo(rec.TopRight());
michael@0:     mPathBuilder->LineTo(rec.BottomRight());
michael@0:     mPathBuilder->LineTo(rec.BottomLeft());
michael@0:     mPathBuilder->Close();
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Ellipse(const gfxPoint& center, const gfxSize& dimensions)
michael@0: {
michael@0:   gfxSize halfDim = dimensions / 2.0;
michael@0:   gfxRect r(center - gfxPoint(halfDim.width, halfDim.height), dimensions);
michael@0:   gfxCornerSizes c(halfDim, halfDim, halfDim, halfDim);
michael@0: 
michael@0:   RoundedRectangle (r, c);
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Polygon(const gfxPoint *points, uint32_t numPoints)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (numPoints == 0)
michael@0:         return;
michael@0: 
michael@0:     cairo_move_to(mCairo, points[0].x, points[0].y);
michael@0:     for (uint32_t i = 1; i < numPoints; ++i) {
michael@0:         cairo_line_to(mCairo, points[i].x, points[i].y);
michael@0:     }
michael@0:   } else {
michael@0:     if (numPoints == 0) {
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     EnsurePathBuilder();
michael@0: 
michael@0:     mPathBuilder->MoveTo(ToPoint(points[0]));
michael@0:     for (uint32_t i = 1; i < numPoints; i++) {
michael@0:       mPathBuilder->LineTo(ToPoint(points[i]));
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::DrawSurface(gfxASurface *surface, const gfxSize& size)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_save(mCairo);
michael@0:     cairo_set_source_surface(mCairo, surface->CairoSurface(), 0, 0);
michael@0:     cairo_new_path(mCairo);
michael@0: 
michael@0:     // pixel-snap this
michael@0:     Rectangle(gfxRect(gfxPoint(0.0, 0.0), size), true);
michael@0: 
michael@0:     cairo_fill(mCairo);
michael@0:     cairo_restore(mCairo);
michael@0:   } else {
michael@0:     // Lifetime needs to be limited here since we may wrap surface's data.
michael@0:     RefPtr<SourceSurface> surf =
michael@0:       gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
michael@0: 
michael@0:     if (!surf) {
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     Rect rect(0, 0, Float(size.width), Float(size.height));
michael@0:     rect.Intersect(Rect(0, 0, Float(surf->GetSize().width), Float(surf->GetSize().height)));
michael@0: 
michael@0:     // XXX - Should fix pixel snapping.
michael@0:     mDT->DrawSurface(surf, rect, rect);
michael@0:   }
michael@0: }
michael@0: 
michael@0: // transform stuff
michael@0: void
michael@0: gfxContext::Translate(const gfxPoint& pt)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_translate(mCairo, pt.x, pt.y);
michael@0:   } else {
michael@0:     Matrix newMatrix = mTransform;
michael@0: 
michael@0:     ChangeTransform(newMatrix.Translate(Float(pt.x), Float(pt.y)));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Scale(gfxFloat x, gfxFloat y)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_scale(mCairo, x, y);
michael@0:   } else {
michael@0:     Matrix newMatrix = mTransform;
michael@0: 
michael@0:     ChangeTransform(newMatrix.Scale(Float(x), Float(y)));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Rotate(gfxFloat angle)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_rotate(mCairo, angle);
michael@0:   } else {
michael@0:     Matrix rotation = Matrix::Rotation(Float(angle));
michael@0:     ChangeTransform(rotation * mTransform);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Multiply(const gfxMatrix& matrix)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     const cairo_matrix_t& mat = reinterpret_cast<const cairo_matrix_t&>(matrix);
michael@0:     cairo_transform(mCairo, &mat);
michael@0:   } else {
michael@0:     ChangeTransform(ToMatrix(matrix) * mTransform);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::MultiplyAndNudgeToIntegers(const gfxMatrix& matrix)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     const cairo_matrix_t& mat = reinterpret_cast<const cairo_matrix_t&>(matrix);
michael@0:     cairo_transform(mCairo, &mat);
michael@0:     // XXX nudging to integers not currently supported for Thebes
michael@0:   } else {
michael@0:     Matrix transform = ToMatrix(matrix) * mTransform;
michael@0:     transform.NudgeToIntegers();
michael@0:     ChangeTransform(transform);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetMatrix(const gfxMatrix& matrix)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     const cairo_matrix_t& mat = reinterpret_cast<const cairo_matrix_t&>(matrix);
michael@0:     cairo_set_matrix(mCairo, &mat);
michael@0:   } else {
michael@0:     ChangeTransform(ToMatrix(matrix));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::IdentityMatrix()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_identity_matrix(mCairo);
michael@0:   } else {
michael@0:     ChangeTransform(Matrix());
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxMatrix
michael@0: gfxContext::CurrentMatrix() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_matrix_t mat;
michael@0:     cairo_get_matrix(mCairo, &mat);
michael@0:     return gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat));
michael@0:   } else {
michael@0:     return ThebesMatrix(mTransform);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::NudgeCurrentMatrixToIntegers()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_matrix_t mat;
michael@0:     cairo_get_matrix(mCairo, &mat);
michael@0:     gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat)).NudgeToIntegers();
michael@0:     cairo_set_matrix(mCairo, &mat);
michael@0:   } else {
michael@0:     gfxMatrix matrix = ThebesMatrix(mTransform);
michael@0:     matrix.NudgeToIntegers();
michael@0:     ChangeTransform(ToMatrix(matrix));
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxPoint
michael@0: gfxContext::DeviceToUser(const gfxPoint& point) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     gfxPoint ret = point;
michael@0:     cairo_device_to_user(mCairo, &ret.x, &ret.y);
michael@0:     return ret;
michael@0:   } else {
michael@0:     Matrix matrix = mTransform;
michael@0: 
michael@0:     matrix.Invert();
michael@0: 
michael@0:     return ThebesPoint(matrix * ToPoint(point));
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxSize
michael@0: gfxContext::DeviceToUser(const gfxSize& size) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     gfxSize ret = size;
michael@0:     cairo_device_to_user_distance(mCairo, &ret.width, &ret.height);
michael@0:     return ret;
michael@0:   } else {
michael@0:     Matrix matrix = mTransform;
michael@0: 
michael@0:     matrix.Invert();
michael@0: 
michael@0:     return ThebesSize(matrix * ToSize(size));
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::DeviceToUser(const gfxRect& rect) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     gfxRect ret = rect;
michael@0:     cairo_device_to_user(mCairo, &ret.x, &ret.y);
michael@0:     cairo_device_to_user_distance(mCairo, &ret.width, &ret.height);
michael@0:     return ret;
michael@0:   } else {
michael@0:     Matrix matrix = mTransform;
michael@0: 
michael@0:     matrix.Invert();
michael@0: 
michael@0:     return ThebesRect(matrix.TransformBounds(ToRect(rect)));
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxPoint
michael@0: gfxContext::UserToDevice(const gfxPoint& point) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     gfxPoint ret = point;
michael@0:     cairo_user_to_device(mCairo, &ret.x, &ret.y);
michael@0:     return ret;
michael@0:   } else {
michael@0:     return ThebesPoint(mTransform * ToPoint(point));
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxSize
michael@0: gfxContext::UserToDevice(const gfxSize& size) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     gfxSize ret = size;
michael@0:     cairo_user_to_device_distance(mCairo, &ret.width, &ret.height);
michael@0:     return ret;
michael@0:   } else {
michael@0:     const Matrix &matrix = mTransform;
michael@0: 
michael@0:     gfxSize newSize;
michael@0:     newSize.width = size.width * matrix._11 + size.height * matrix._12;
michael@0:     newSize.height = size.width * matrix._21 + size.height * matrix._22;
michael@0:     return newSize;
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::UserToDevice(const gfxRect& rect) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double xmin = rect.X(), ymin = rect.Y(), xmax = rect.XMost(), ymax = rect.YMost();
michael@0: 
michael@0:     double x[3], y[3];
michael@0:     x[0] = xmin;  y[0] = ymax;
michael@0:     x[1] = xmax;  y[1] = ymax;
michael@0:     x[2] = xmax;  y[2] = ymin;
michael@0: 
michael@0:     cairo_user_to_device(mCairo, &xmin, &ymin);
michael@0:     xmax = xmin;
michael@0:     ymax = ymin;
michael@0:     for (int i = 0; i < 3; i++) {
michael@0:         cairo_user_to_device(mCairo, &x[i], &y[i]);
michael@0:         xmin = std::min(xmin, x[i]);
michael@0:         xmax = std::max(xmax, x[i]);
michael@0:         ymin = std::min(ymin, y[i]);
michael@0:         ymax = std::max(ymax, y[i]);
michael@0:     }
michael@0: 
michael@0:     return gfxRect(xmin, ymin, xmax - xmin, ymax - ymin);
michael@0:   } else {
michael@0:     const Matrix &matrix = mTransform;
michael@0:     return ThebesRect(matrix.TransformBounds(ToRect(rect)));
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::UserToDevicePixelSnapped(gfxRect& rect, bool ignoreScale) const
michael@0: {
michael@0:   if (GetFlags() & FLAG_DISABLE_SNAPPING)
michael@0:       return false;
michael@0: 
michael@0:   // if we're not at 1.0 scale, don't snap, unless we're
michael@0:   // ignoring the scale.  If we're not -just- a scale,
michael@0:   // never snap.
michael@0:   const gfxFloat epsilon = 0.0000001;
michael@0: #define WITHIN_E(a,b) (fabs((a)-(b)) < epsilon)
michael@0:   if (mCairo) {
michael@0:     cairo_matrix_t mat;
michael@0:     cairo_get_matrix(mCairo, &mat);
michael@0:     if (!ignoreScale &&
michael@0:         (!WITHIN_E(mat.xx,1.0) || !WITHIN_E(mat.yy,1.0) ||
michael@0:           !WITHIN_E(mat.xy,0.0) || !WITHIN_E(mat.yx,0.0)))
michael@0:         return false;
michael@0:   } else {
michael@0:     Matrix mat = mTransform;
michael@0:     if (!ignoreScale &&
michael@0:         (!WITHIN_E(mat._11,1.0) || !WITHIN_E(mat._22,1.0) ||
michael@0:           !WITHIN_E(mat._12,0.0) || !WITHIN_E(mat._21,0.0)))
michael@0:         return false;
michael@0:   }
michael@0: #undef WITHIN_E
michael@0: 
michael@0:   gfxPoint p1 = UserToDevice(rect.TopLeft());
michael@0:   gfxPoint p2 = UserToDevice(rect.TopRight());
michael@0:   gfxPoint p3 = UserToDevice(rect.BottomRight());
michael@0: 
michael@0:   // Check that the rectangle is axis-aligned. For an axis-aligned rectangle,
michael@0:   // two opposite corners define the entire rectangle. So check if
michael@0:   // the axis-aligned rectangle with opposite corners p1 and p3
michael@0:   // define an axis-aligned rectangle whose other corners are p2 and p4.
michael@0:   // We actually only need to check one of p2 and p4, since an affine
michael@0:   // transform maps parallelograms to parallelograms.
michael@0:   if (p2 == gfxPoint(p1.x, p3.y) || p2 == gfxPoint(p3.x, p1.y)) {
michael@0:       p1.Round();
michael@0:       p3.Round();
michael@0: 
michael@0:       rect.MoveTo(gfxPoint(std::min(p1.x, p3.x), std::min(p1.y, p3.y)));
michael@0:       rect.SizeTo(gfxSize(std::max(p1.x, p3.x) - rect.X(),
michael@0:                           std::max(p1.y, p3.y) - rect.Y()));
michael@0:       return true;
michael@0:   }
michael@0: 
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::UserToDevicePixelSnapped(gfxPoint& pt, bool ignoreScale) const
michael@0: {
michael@0:   if (GetFlags() & FLAG_DISABLE_SNAPPING)
michael@0:       return false;
michael@0: 
michael@0:   // if we're not at 1.0 scale, don't snap, unless we're
michael@0:   // ignoring the scale.  If we're not -just- a scale,
michael@0:   // never snap.
michael@0:   const gfxFloat epsilon = 0.0000001;
michael@0: #define WITHIN_E(a,b) (fabs((a)-(b)) < epsilon)
michael@0:   if (mCairo) {
michael@0:     cairo_matrix_t mat;
michael@0:     cairo_get_matrix(mCairo, &mat);
michael@0:     if (!ignoreScale &&
michael@0:         (!WITHIN_E(mat.xx,1.0) || !WITHIN_E(mat.yy,1.0) ||
michael@0:           !WITHIN_E(mat.xy,0.0) || !WITHIN_E(mat.yx,0.0)))
michael@0:         return false;
michael@0:   } else {
michael@0:     Matrix mat = mTransform;
michael@0:     if (!ignoreScale &&
michael@0:         (!WITHIN_E(mat._11,1.0) || !WITHIN_E(mat._22,1.0) ||
michael@0:           !WITHIN_E(mat._12,0.0) || !WITHIN_E(mat._21,0.0)))
michael@0:         return false;
michael@0:   }
michael@0: #undef WITHIN_E
michael@0: 
michael@0:   pt = UserToDevice(pt);
michael@0:   pt.Round();
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::PixelSnappedRectangleAndSetPattern(const gfxRect& rect,
michael@0:                                                gfxPattern *pattern)
michael@0: {
michael@0:   gfxRect r(rect);
michael@0: 
michael@0:   // Bob attempts to pixel-snap the rectangle, and returns true if
michael@0:   // the snapping succeeds.  If it does, we need to set up an
michael@0:   // identity matrix, because the rectangle given back is in device
michael@0:   // coordinates.
michael@0:   //
michael@0:   // We then have to call a translate to dr.pos afterwards, to make
michael@0:   // sure the image lines up in the right place with our pixel
michael@0:   // snapped rectangle.
michael@0:   //
michael@0:   // If snapping wasn't successful, we just translate to where the
michael@0:   // pattern would normally start (in app coordinates) and do the
michael@0:   // same thing.
michael@0:   Rectangle(r, true);
michael@0:   SetPattern(pattern);
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetAntialiasMode(AntialiasMode mode)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (mode == MODE_ALIASED) {
michael@0:         cairo_set_antialias(mCairo, CAIRO_ANTIALIAS_NONE);
michael@0:     } else if (mode == MODE_COVERAGE) {
michael@0:         cairo_set_antialias(mCairo, CAIRO_ANTIALIAS_DEFAULT);
michael@0:     }
michael@0:   } else {
michael@0:     if (mode == MODE_ALIASED) {
michael@0:       CurrentState().aaMode = gfx::AntialiasMode::NONE;
michael@0:     } else if (mode == MODE_COVERAGE) {
michael@0:       CurrentState().aaMode = gfx::AntialiasMode::SUBPIXEL;
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::AntialiasMode
michael@0: gfxContext::CurrentAntialiasMode() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_antialias_t aa = cairo_get_antialias(mCairo);
michael@0:     if (aa == CAIRO_ANTIALIAS_NONE)
michael@0:         return MODE_ALIASED;
michael@0:     return MODE_COVERAGE;
michael@0:   } else {
michael@0:     if (CurrentState().aaMode == gfx::AntialiasMode::NONE) {
michael@0:       return MODE_ALIASED;
michael@0:     }
michael@0:     return MODE_COVERAGE;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetDash(gfxLineType ltype)
michael@0: {
michael@0:   static double dash[] = {5.0, 5.0};
michael@0:   static double dot[] = {1.0, 1.0};
michael@0: 
michael@0:   switch (ltype) {
michael@0:       case gfxLineDashed:
michael@0:           SetDash(dash, 2, 0.0);
michael@0:           break;
michael@0:       case gfxLineDotted:
michael@0:           SetDash(dot, 2, 0.0);
michael@0:           break;
michael@0:       case gfxLineSolid:
michael@0:       default:
michael@0:           SetDash(nullptr, 0, 0.0);
michael@0:           break;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetDash(gfxFloat *dashes, int ndash, gfxFloat offset)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_dash(mCairo, dashes, ndash, offset);
michael@0:   } else {
michael@0:     AzureState &state = CurrentState();
michael@0: 
michael@0:     state.dashPattern.SetLength(ndash);
michael@0:     for (int i = 0; i < ndash; i++) {
michael@0:       state.dashPattern[i] = Float(dashes[i]);
michael@0:     }
michael@0:     state.strokeOptions.mDashLength = ndash;
michael@0:     state.strokeOptions.mDashOffset = Float(offset);
michael@0:     state.strokeOptions.mDashPattern = ndash ? state.dashPattern.Elements()
michael@0:                                              : nullptr;
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::CurrentDash(FallibleTArray<gfxFloat>& dashes, gfxFloat* offset) const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     int count = cairo_get_dash_count(mCairo);
michael@0:     if (count <= 0 || !dashes.SetLength(count)) {
michael@0:         return false;
michael@0:     }
michael@0:     cairo_get_dash(mCairo, dashes.Elements(), offset);
michael@0:     return true;
michael@0:   } else {
michael@0:     const AzureState &state = CurrentState();
michael@0:     int count = state.strokeOptions.mDashLength;
michael@0: 
michael@0:     if (count <= 0 || !dashes.SetLength(count)) {
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     for (int i = 0; i < count; i++) {
michael@0:       dashes[i] = state.dashPattern[i];
michael@0:     }
michael@0: 
michael@0:     *offset = state.strokeOptions.mDashOffset;
michael@0: 
michael@0:     return true;
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxFloat
michael@0: gfxContext::CurrentDashOffset() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (cairo_get_dash_count(mCairo) <= 0) {
michael@0:         return 0.0;
michael@0:     }
michael@0:     gfxFloat offset;
michael@0:     cairo_get_dash(mCairo, nullptr, &offset);
michael@0:     return offset;
michael@0:   } else {
michael@0:     return CurrentState().strokeOptions.mDashOffset;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetLineWidth(gfxFloat width)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_line_width(mCairo, width);
michael@0:   } else {
michael@0:     CurrentState().strokeOptions.mLineWidth = Float(width);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxFloat
michael@0: gfxContext::CurrentLineWidth() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_get_line_width(mCairo);
michael@0:   } else {
michael@0:     return CurrentState().strokeOptions.mLineWidth;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetOperator(GraphicsOperator op)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (mFlags & FLAG_SIMPLIFY_OPERATORS) {
michael@0:         if (op != OPERATOR_SOURCE &&
michael@0:             op != OPERATOR_CLEAR &&
michael@0:             op != OPERATOR_OVER)
michael@0:             op = OPERATOR_OVER;
michael@0:     }
michael@0: 
michael@0:     cairo_set_operator(mCairo, (cairo_operator_t)op);
michael@0:   } else {
michael@0:     if (op == OPERATOR_CLEAR) {
michael@0:       CurrentState().opIsClear = true;
michael@0:       return;
michael@0:     }
michael@0:     CurrentState().opIsClear = false;
michael@0:     CurrentState().op = CompositionOpForOp(op);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::GraphicsOperator
michael@0: gfxContext::CurrentOperator() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return (GraphicsOperator)cairo_get_operator(mCairo);
michael@0:   } else {
michael@0:     return ThebesOp(CurrentState().op);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetLineCap(GraphicsLineCap cap)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_line_cap(mCairo, (cairo_line_cap_t)cap);
michael@0:   } else {
michael@0:     CurrentState().strokeOptions.mLineCap = ToCapStyle(cap);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::GraphicsLineCap
michael@0: gfxContext::CurrentLineCap() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return (GraphicsLineCap)cairo_get_line_cap(mCairo);
michael@0:   } else {
michael@0:     return ThebesLineCap(CurrentState().strokeOptions.mLineCap);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetLineJoin(GraphicsLineJoin join)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_line_join(mCairo, (cairo_line_join_t)join);
michael@0:   } else {
michael@0:     CurrentState().strokeOptions.mLineJoin = ToJoinStyle(join);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::GraphicsLineJoin
michael@0: gfxContext::CurrentLineJoin() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return (GraphicsLineJoin)cairo_get_line_join(mCairo);
michael@0:   } else {
michael@0:     return ThebesLineJoin(CurrentState().strokeOptions.mLineJoin);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetMiterLimit(gfxFloat limit)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_miter_limit(mCairo, limit);
michael@0:   } else {
michael@0:     CurrentState().strokeOptions.mMiterLimit = Float(limit);
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxFloat
michael@0: gfxContext::CurrentMiterLimit() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_get_miter_limit(mCairo);
michael@0:   } else {
michael@0:     return CurrentState().strokeOptions.mMiterLimit;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetFillRule(FillRule rule)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_fill_rule(mCairo, (cairo_fill_rule_t)rule);
michael@0:   } else {
michael@0:     CurrentState().fillRule = rule == FILL_RULE_WINDING ? gfx::FillRule::FILL_WINDING : gfx::FillRule::FILL_EVEN_ODD;
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxContext::FillRule
michael@0: gfxContext::CurrentFillRule() const
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return (FillRule)cairo_get_fill_rule(mCairo);
michael@0:   } else {
michael@0:     return FILL_RULE_WINDING;
michael@0:   }
michael@0: }
michael@0: 
michael@0: // clipping
michael@0: void
michael@0: gfxContext::Clip(const gfxRect& rect)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_new_path(mCairo);
michael@0:     cairo_rectangle(mCairo, rect.X(), rect.Y(), rect.Width(), rect.Height());
michael@0:     cairo_clip(mCairo);
michael@0:   } else {
michael@0:     AzureState::PushedClip clip = { nullptr, ToRect(rect), mTransform };
michael@0:     CurrentState().pushedClips.AppendElement(clip);
michael@0:     mDT->PushClipRect(ToRect(rect));
michael@0:     NewPath();
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Clip()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_clip_preserve(mCairo);
michael@0:   } else {
michael@0:     if (mPathIsRect) {
michael@0:       MOZ_ASSERT(!mTransformChanged);
michael@0: 
michael@0:       AzureState::PushedClip clip = { nullptr, mRect, mTransform };
michael@0:       CurrentState().pushedClips.AppendElement(clip);
michael@0:       mDT->PushClipRect(mRect);
michael@0:     } else {
michael@0:       EnsurePath();
michael@0:       mDT->PushClip(mPath);
michael@0:       AzureState::PushedClip clip = { mPath, Rect(), mTransform };
michael@0:       CurrentState().pushedClips.AppendElement(clip);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::ResetClip()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_reset_clip(mCairo);
michael@0:   } else {
michael@0:     for (int i = mStateStack.Length() - 1; i >= 0; i--) {
michael@0:       for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
michael@0:         mDT->PopClip();
michael@0:       }
michael@0: 
michael@0:       if (mStateStack[i].clipWasReset) {
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0:     CurrentState().pushedClips.Clear();
michael@0:     CurrentState().clipWasReset = true;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::UpdateSurfaceClip()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     NewPath();
michael@0:     // we paint an empty rectangle to ensure the clip is propagated to
michael@0:     // the destination surface
michael@0:     SetDeviceColor(gfxRGBA(0,0,0,0));
michael@0:     Rectangle(gfxRect(0,1,1,0));
michael@0:     Fill();
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::GetClipExtents()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double xmin, ymin, xmax, ymax;
michael@0:     cairo_clip_extents(mCairo, &xmin, &ymin, &xmax, &ymax);
michael@0:     return gfxRect(xmin, ymin, xmax - xmin, ymax - ymin);
michael@0:   } else {
michael@0:     Rect rect = GetAzureDeviceSpaceClipBounds();
michael@0: 
michael@0:     if (rect.width == 0 || rect.height == 0) {
michael@0:       return gfxRect(0, 0, 0, 0);
michael@0:     }
michael@0: 
michael@0:     Matrix mat = mTransform;
michael@0:     mat.Invert();
michael@0:     rect = mat.TransformBounds(rect);
michael@0: 
michael@0:     return ThebesRect(rect);
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::ClipContainsRect(const gfxRect& aRect)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_rectangle_list_t *clip =
michael@0:         cairo_copy_clip_rectangle_list(mCairo);
michael@0: 
michael@0:     bool result = false;
michael@0: 
michael@0:     if (clip->status == CAIRO_STATUS_SUCCESS) {
michael@0:         for (int i = 0; i < clip->num_rectangles; i++) {
michael@0:             gfxRect rect(clip->rectangles[i].x, clip->rectangles[i].y,
michael@0:                          clip->rectangles[i].width, clip->rectangles[i].height);
michael@0:             if (rect.Contains(aRect)) {
michael@0:                 result = true;
michael@0:                 break;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     cairo_rectangle_list_destroy(clip);
michael@0:     return result;
michael@0:   } else {
michael@0:     unsigned int lastReset = 0;
michael@0:     for (int i = mStateStack.Length() - 2; i > 0; i--) {
michael@0:       if (mStateStack[i].clipWasReset) {
michael@0:         lastReset = i;
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     // Since we always return false when the clip list contains a
michael@0:     // non-rectangular clip or a non-rectilinear transform, our 'total' clip
michael@0:     // is always a rectangle if we hit the end of this function.
michael@0:     Rect clipBounds(0, 0, Float(mDT->GetSize().width), Float(mDT->GetSize().height));
michael@0: 
michael@0:     for (unsigned int i = lastReset; i < mStateStack.Length(); i++) {
michael@0:       for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
michael@0:         AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
michael@0:         if (clip.path || !clip.transform.IsRectilinear()) {
michael@0:           // Cairo behavior is we return false if the clip contains a non-
michael@0:           // rectangle.
michael@0:           return false;
michael@0:         } else {
michael@0:           Rect clipRect = mTransform.TransformBounds(clip.rect);
michael@0: 
michael@0:           clipBounds.IntersectRect(clipBounds, clipRect);
michael@0:         }
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     return clipBounds.Contains(ToRect(aRect));
michael@0:   }
michael@0: }
michael@0: 
michael@0: // rendering sources
michael@0: 
michael@0: void
michael@0: gfxContext::SetColor(const gfxRGBA& c)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
michael@0: 
michael@0:         gfxRGBA cms;
michael@0:         qcms_transform *transform = gfxPlatform::GetCMSRGBTransform();
michael@0:         if (transform)
michael@0:           gfxPlatform::TransformPixel(c, cms, transform);
michael@0: 
michael@0:         // Use the original alpha to avoid unnecessary float->byte->float
michael@0:         // conversion errors
michael@0:         cairo_set_source_rgba(mCairo, cms.r, cms.g, cms.b, c.a);
michael@0:     }
michael@0:     else
michael@0:         cairo_set_source_rgba(mCairo, c.r, c.g, c.b, c.a);
michael@0:   } else {
michael@0:     CurrentState().pattern = nullptr;
michael@0:     CurrentState().sourceSurfCairo = nullptr;
michael@0:     CurrentState().sourceSurface = nullptr;
michael@0: 
michael@0:     if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
michael@0: 
michael@0:         gfxRGBA cms;
michael@0:         qcms_transform *transform = gfxPlatform::GetCMSRGBTransform();
michael@0:         if (transform)
michael@0:           gfxPlatform::TransformPixel(c, cms, transform);
michael@0: 
michael@0:         // Use the original alpha to avoid unnecessary float->byte->float
michael@0:         // conversion errors
michael@0:         CurrentState().color = ToColor(cms);
michael@0:     }
michael@0:     else
michael@0:         CurrentState().color = ToColor(c);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetDeviceColor(const gfxRGBA& c)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_set_source_rgba(mCairo, c.r, c.g, c.b, c.a);
michael@0:   } else {
michael@0:     CurrentState().pattern = nullptr;
michael@0:     CurrentState().sourceSurfCairo = nullptr;
michael@0:     CurrentState().sourceSurface = nullptr;
michael@0:     CurrentState().color = ToColor(c);
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::GetDeviceColor(gfxRGBA& c)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_pattern_get_rgba(cairo_get_source(mCairo),
michael@0:                                   &c.r,
michael@0:                                   &c.g,
michael@0:                                   &c.b,
michael@0:                                   &c.a) == CAIRO_STATUS_SUCCESS;
michael@0:   } else {
michael@0:     if (CurrentState().sourceSurface) {
michael@0:       return false;
michael@0:     }
michael@0:     if (CurrentState().pattern) {
michael@0:       gfxRGBA color;
michael@0:       return CurrentState().pattern->GetSolidColor(c);
michael@0:     }
michael@0: 
michael@0:     c = ThebesRGBA(CurrentState().color);
michael@0:     return true;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetSource(gfxASurface *surface, const gfxPoint& offset)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     NS_ASSERTION(surface->GetAllowUseAsSource(), "Surface not allowed to be used as source!");
michael@0:     cairo_set_source_surface(mCairo, surface->CairoSurface(), offset.x, offset.y);
michael@0:   } else {
michael@0:     CurrentState().surfTransform = Matrix(1.0f, 0, 0, 1.0f, Float(offset.x), Float(offset.y));
michael@0:     CurrentState().pattern = nullptr;
michael@0:     CurrentState().patternTransformChanged = false;
michael@0:     // Keep the underlying cairo surface around while we keep the
michael@0:     // sourceSurface.
michael@0:     CurrentState().sourceSurfCairo = surface;
michael@0:     CurrentState().sourceSurface =
michael@0:       gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
michael@0:     CurrentState().color = Color(0, 0, 0, 0);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::SetPattern(gfxPattern *pattern)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     MOZ_ASSERT(!pattern->IsAzure());
michael@0:     cairo_set_source(mCairo, pattern->CairoPattern());
michael@0:   } else {
michael@0:     CurrentState().sourceSurfCairo = nullptr;
michael@0:     CurrentState().sourceSurface = nullptr;
michael@0:     CurrentState().patternTransformChanged = false;
michael@0:     CurrentState().pattern = pattern;
michael@0:   }
michael@0: }
michael@0: 
michael@0: already_AddRefed<gfxPattern>
michael@0: gfxContext::GetPattern()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_pattern_t *pat = cairo_get_source(mCairo);
michael@0:     NS_ASSERTION(pat, "I was told this couldn't be null");
michael@0: 
michael@0:     nsRefPtr<gfxPattern> wrapper;
michael@0:     if (pat)
michael@0:         wrapper = new gfxPattern(pat);
michael@0:     else
michael@0:         wrapper = new gfxPattern(gfxRGBA(0,0,0,0));
michael@0: 
michael@0:     return wrapper.forget();
michael@0:   } else {
michael@0:     nsRefPtr<gfxPattern> pat;
michael@0:     
michael@0:     AzureState &state = CurrentState();
michael@0:     if (state.pattern) {
michael@0:       pat = state.pattern;
michael@0:     } else if (state.sourceSurface) {
michael@0:       NS_ASSERTION(false, "Ugh, this isn't good.");
michael@0:     } else {
michael@0:       pat = new gfxPattern(ThebesRGBA(state.color));
michael@0:     }
michael@0:     return pat.forget();
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: // masking
michael@0: void
michael@0: gfxContext::Mask(gfxPattern *pattern)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     MOZ_ASSERT(!pattern->IsAzure());
michael@0:     cairo_mask(mCairo, pattern->CairoPattern());
michael@0:   } else {
michael@0:     if (pattern->Extend() == gfxPattern::EXTEND_NONE) {
michael@0:       // In this situation the mask will be fully transparent (i.e. nothing
michael@0:       // will be drawn) outside of the bounds of the surface. We can support
michael@0:       // that by clipping out drawing to that area.
michael@0:       Point offset;
michael@0:       if (pattern->IsAzure()) {
michael@0:         // This is an Azure pattern. i.e. this was the result of a PopGroup and
michael@0:         // then the extend mode was changed to EXTEND_NONE.
michael@0:         // XXX - We may need some additional magic here in theory to support
michael@0:         // device offsets in these patterns, but no problems have been observed
michael@0:         // yet because of this. And it would complicate things a little further.
michael@0:         offset = Point(0.f, 0.f);
michael@0:       } else if (pattern->GetType() == gfxPattern::PATTERN_SURFACE) {
michael@0:         nsRefPtr<gfxASurface> asurf = pattern->GetSurface();
michael@0:         gfxPoint deviceOffset = asurf->GetDeviceOffset();
michael@0:         offset = Point(-deviceOffset.x, -deviceOffset.y);
michael@0: 
michael@0:         // this lets GetAzureSurface work
michael@0:         pattern->GetPattern(mDT);
michael@0:       }
michael@0: 
michael@0:       if (pattern->IsAzure() || pattern->GetType() == gfxPattern::PATTERN_SURFACE) {
michael@0:         RefPtr<SourceSurface> mask = pattern->GetAzureSurface();
michael@0:         Matrix mat = ToMatrix(pattern->GetInverseMatrix());
michael@0:         Matrix old = mTransform;
michael@0:         // add in the inverse of the pattern transform so that when we
michael@0:         // MaskSurface we are transformed to the place matching the pattern transform
michael@0:         mat = mat * mTransform;
michael@0: 
michael@0:         ChangeTransform(mat);
michael@0:         mDT->MaskSurface(GeneralPattern(this), mask, offset, DrawOptions(1.0f, CurrentState().op, CurrentState().aaMode));
michael@0:         ChangeTransform(old);
michael@0:         return;
michael@0:       }
michael@0:     }
michael@0:     mDT->Mask(GeneralPattern(this), *pattern->GetPattern(mDT), DrawOptions(1.0f, CurrentState().op, CurrentState().aaMode));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Mask(gfxASurface *surface, const gfxPoint& offset)
michael@0: {
michael@0:   PROFILER_LABEL("gfxContext", "Mask");
michael@0:   if (mCairo) {
michael@0:     cairo_mask_surface(mCairo, surface->CairoSurface(), offset.x, offset.y);
michael@0:   } else {
michael@0:     // Lifetime needs to be limited here as we may simply wrap surface's data.
michael@0:     RefPtr<SourceSurface> sourceSurf =
michael@0:       gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
michael@0: 
michael@0:     if (!sourceSurf) {
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     gfxPoint pt = surface->GetDeviceOffset();
michael@0: 
michael@0:     Mask(sourceSurf, Point(offset.x - pt.x, offset.y - pt.y));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Mask(SourceSurface *surface, const Point& offset)
michael@0: {
michael@0:   MOZ_ASSERT(mDT);
michael@0: 
michael@0: 
michael@0:   // We clip here to bind to the mask surface bounds, see above.
michael@0:   mDT->MaskSurface(GeneralPattern(this),
michael@0:             surface,
michael@0:             offset,
michael@0:             DrawOptions(1.0f, CurrentState().op, CurrentState().aaMode));
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::Paint(gfxFloat alpha)
michael@0: {
michael@0:   PROFILER_LABEL("gfxContext", "Paint");
michael@0:   if (mCairo) {
michael@0:     cairo_paint_with_alpha(mCairo, alpha);
michael@0:   } else {
michael@0:     AzureState &state = CurrentState();
michael@0: 
michael@0:     if (state.sourceSurface && !state.sourceSurfCairo &&
michael@0:         !state.patternTransformChanged && !state.opIsClear)
michael@0:     {
michael@0:       // This is the case where a PopGroupToSource has been done and this
michael@0:       // paint is executed without changing the transform or the source.
michael@0:       Matrix oldMat = mDT->GetTransform();
michael@0: 
michael@0:       IntSize surfSize = state.sourceSurface->GetSize();
michael@0: 
michael@0:       Matrix mat;
michael@0:       mat.Translate(-state.deviceOffset.x, -state.deviceOffset.y);
michael@0:       mDT->SetTransform(mat);
michael@0: 
michael@0:       mDT->DrawSurface(state.sourceSurface,
michael@0:                        Rect(state.sourceSurfaceDeviceOffset, Size(surfSize.width, surfSize.height)),
michael@0:                        Rect(Point(), Size(surfSize.width, surfSize.height)),
michael@0:                        DrawSurfaceOptions(), DrawOptions(alpha, GetOp()));
michael@0:       mDT->SetTransform(oldMat);
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     Matrix mat = mDT->GetTransform();
michael@0:     mat.Invert();
michael@0:     Rect paintRect = mat.TransformBounds(Rect(Point(0, 0), Size(mDT->GetSize())));
michael@0: 
michael@0:     if (state.opIsClear) {
michael@0:       mDT->ClearRect(paintRect);
michael@0:     } else {
michael@0:       mDT->FillRect(paintRect, GeneralPattern(this),
michael@0:                     DrawOptions(Float(alpha), GetOp()));
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: // groups
michael@0: 
michael@0: void
michael@0: gfxContext::PushGroup(gfxContentType content)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_push_group_with_content(mCairo, (cairo_content_t)(int) content);
michael@0:   } else {
michael@0:     PushNewDT(content);
michael@0: 
michael@0:     PushClipsToDT(mDT);
michael@0:     mDT->SetTransform(GetDTTransform());
michael@0:   }
michael@0: }
michael@0: 
michael@0: static gfxRect
michael@0: GetRoundOutDeviceClipExtents(gfxContext* aCtx)
michael@0: {
michael@0:   gfxContextMatrixAutoSaveRestore save(aCtx);
michael@0:   aCtx->IdentityMatrix();
michael@0:   gfxRect r = aCtx->GetClipExtents();
michael@0:   r.RoundOut();
michael@0:   return r;
michael@0: }
michael@0: 
michael@0: /**
michael@0:  * Copy the contents of aSrc to aDest, translated by aTranslation.
michael@0:  */
michael@0: static void
michael@0: CopySurface(gfxASurface* aSrc, gfxASurface* aDest, const gfxPoint& aTranslation)
michael@0: {
michael@0:   cairo_t *cr = cairo_create(aDest->CairoSurface());
michael@0:   cairo_set_source_surface(cr, aSrc->CairoSurface(), aTranslation.x, aTranslation.y);
michael@0:   cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
michael@0:   cairo_paint(cr);
michael@0:   cairo_destroy(cr);
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::PushGroupAndCopyBackground(gfxContentType content)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     if (content == gfxContentType::COLOR_ALPHA &&
michael@0:       !(GetFlags() & FLAG_DISABLE_COPY_BACKGROUND)) {
michael@0:       nsRefPtr<gfxASurface> s = CurrentSurface();
michael@0:       if ((s->GetAllowUseAsSource() || s->GetType() == gfxSurfaceType::Tee) &&
michael@0:           (s->GetContentType() == gfxContentType::COLOR ||
michael@0:               s->GetOpaqueRect().Contains(GetRoundOutDeviceClipExtents(this)))) {
michael@0:         cairo_push_group_with_content(mCairo, CAIRO_CONTENT_COLOR);
michael@0:         nsRefPtr<gfxASurface> d = CurrentSurface();
michael@0: 
michael@0:         if (d->GetType() == gfxSurfaceType::Tee) {
michael@0:           NS_ASSERTION(s->GetType() == gfxSurfaceType::Tee, "Mismatched types");
michael@0:           nsAutoTArray<nsRefPtr<gfxASurface>,2> ss;
michael@0:           nsAutoTArray<nsRefPtr<gfxASurface>,2> ds;
michael@0:           static_cast<gfxTeeSurface*>(s.get())->GetSurfaces(&ss);
michael@0:           static_cast<gfxTeeSurface*>(d.get())->GetSurfaces(&ds);
michael@0:           NS_ASSERTION(ss.Length() == ds.Length(), "Mismatched lengths");
michael@0:           gfxPoint translation = d->GetDeviceOffset() - s->GetDeviceOffset();
michael@0:           for (uint32_t i = 0; i < ss.Length(); ++i) {
michael@0:               CopySurface(ss[i], ds[i], translation);
michael@0:           }
michael@0:         } else {
michael@0:           CopySurface(s, d, gfxPoint(0, 0));
michael@0:         }
michael@0:         d->SetOpaqueRect(s->GetOpaqueRect());
michael@0:         return;
michael@0:       }
michael@0:     }
michael@0:   } else {
michael@0:     IntRect clipExtents;
michael@0:     if (mDT->GetFormat() != SurfaceFormat::B8G8R8X8) {
michael@0:       gfxRect clipRect = GetRoundOutDeviceClipExtents(this);
michael@0:       clipExtents = IntRect(clipRect.x, clipRect.y, clipRect.width, clipRect.height);
michael@0:     }
michael@0:     if ((mDT->GetFormat() == SurfaceFormat::B8G8R8X8 ||
michael@0:          mDT->GetOpaqueRect().Contains(clipExtents)) &&
michael@0:         !mDT->GetUserData(&sDontUseAsSourceKey)) {
michael@0:       DrawTarget *oldDT = mDT;
michael@0:       RefPtr<SourceSurface> source = mDT->Snapshot();
michael@0:       Point oldDeviceOffset = CurrentState().deviceOffset;
michael@0: 
michael@0:       PushNewDT(gfxContentType::COLOR);
michael@0: 
michael@0:       Point offset = CurrentState().deviceOffset - oldDeviceOffset;
michael@0:       Rect surfRect(0, 0, Float(mDT->GetSize().width), Float(mDT->GetSize().height));
michael@0:       Rect sourceRect = surfRect;
michael@0:       sourceRect.x += offset.x;
michael@0:       sourceRect.y += offset.y;
michael@0: 
michael@0:       mDT->SetTransform(Matrix());
michael@0:       mDT->DrawSurface(source, surfRect, sourceRect);
michael@0:       mDT->SetOpaqueRect(oldDT->GetOpaqueRect());
michael@0: 
michael@0:       PushClipsToDT(mDT);
michael@0:       mDT->SetTransform(GetDTTransform());
michael@0:       return;
michael@0:     }
michael@0:   }
michael@0:   PushGroup(content);
michael@0: }
michael@0: 
michael@0: already_AddRefed<gfxPattern>
michael@0: gfxContext::PopGroup()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_pattern_t *pat = cairo_pop_group(mCairo);
michael@0:     nsRefPtr<gfxPattern> wrapper = new gfxPattern(pat);
michael@0:     cairo_pattern_destroy(pat);
michael@0:     return wrapper.forget();
michael@0:   } else {
michael@0:     RefPtr<SourceSurface> src = mDT->Snapshot();
michael@0:     Point deviceOffset = CurrentState().deviceOffset;
michael@0: 
michael@0:     Restore();
michael@0: 
michael@0:     Matrix mat = mTransform;
michael@0:     mat.Invert();
michael@0: 
michael@0:     Matrix deviceOffsetTranslation;
michael@0:     deviceOffsetTranslation.Translate(deviceOffset.x, deviceOffset.y);
michael@0: 
michael@0:     nsRefPtr<gfxPattern> pat = new gfxPattern(src, deviceOffsetTranslation * mat);
michael@0: 
michael@0:     return pat.forget();
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::PopGroupToSource()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     cairo_pop_group_to_source(mCairo);
michael@0:   } else {
michael@0:     RefPtr<SourceSurface> src = mDT->Snapshot();
michael@0:     Point deviceOffset = CurrentState().deviceOffset;
michael@0:     Restore();
michael@0:     CurrentState().sourceSurfCairo = nullptr;
michael@0:     CurrentState().sourceSurface = src;
michael@0:     CurrentState().sourceSurfaceDeviceOffset = deviceOffset;
michael@0:     CurrentState().pattern = nullptr;
michael@0:     CurrentState().patternTransformChanged = false;
michael@0: 
michael@0:     Matrix mat = mTransform;
michael@0:     mat.Invert();
michael@0: 
michael@0:     Matrix deviceOffsetTranslation;
michael@0:     deviceOffsetTranslation.Translate(deviceOffset.x, deviceOffset.y);
michael@0:     CurrentState().surfTransform = deviceOffsetTranslation * mat;
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::PointInFill(const gfxPoint& pt)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_in_fill(mCairo, pt.x, pt.y);
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     return mPath->ContainsPoint(ToPoint(pt), Matrix());
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::PointInStroke(const gfxPoint& pt)
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_in_stroke(mCairo, pt.x, pt.y);
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     return mPath->StrokeContainsPoint(CurrentState().strokeOptions,
michael@0:                                       ToPoint(pt),
michael@0:                                       Matrix());
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::GetUserPathExtent()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double xmin, ymin, xmax, ymax;
michael@0:     cairo_path_extents(mCairo, &xmin, &ymin, &xmax, &ymax);
michael@0:     return gfxRect(xmin, ymin, xmax - xmin, ymax - ymin);
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     return ThebesRect(mPath->GetBounds());
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::GetUserFillExtent()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double xmin, ymin, xmax, ymax;
michael@0:     cairo_fill_extents(mCairo, &xmin, &ymin, &xmax, &ymax);
michael@0:     return gfxRect(xmin, ymin, xmax - xmin, ymax - ymin);
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     return ThebesRect(mPath->GetBounds());
michael@0:   }
michael@0: }
michael@0: 
michael@0: gfxRect
michael@0: gfxContext::GetUserStrokeExtent()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     double xmin, ymin, xmax, ymax;
michael@0:     cairo_stroke_extents(mCairo, &xmin, &ymin, &xmax, &ymax);
michael@0:     return gfxRect(xmin, ymin, xmax - xmin, ymax - ymin);
michael@0:   } else {
michael@0:     EnsurePath();
michael@0:     return ThebesRect(mPath->GetStrokedBounds(CurrentState().strokeOptions, mTransform));
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: gfxContext::HasError()
michael@0: {
michael@0:   if (mCairo) {
michael@0:     return cairo_status(mCairo) != CAIRO_STATUS_SUCCESS;
michael@0:   } else {
michael@0:     // As far as this is concerned, an Azure context is never in error.
michael@0:     return false;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::RoundedRectangle(const gfxRect& rect,
michael@0:                              const gfxCornerSizes& corners,
michael@0:                              bool draw_clockwise)
michael@0: {
michael@0:     //
michael@0:     // For CW drawing, this looks like:
michael@0:     //
michael@0:     //  ...******0**      1    C
michael@0:     //              ****
michael@0:     //                  ***    2
michael@0:     //                     **
michael@0:     //                       *
michael@0:     //                        *
michael@0:     //                         3
michael@0:     //                         *
michael@0:     //                         *
michael@0:     //
michael@0:     // Where 0, 1, 2, 3 are the control points of the Bezier curve for
michael@0:     // the corner, and C is the actual corner point.
michael@0:     //
michael@0:     // At the start of the loop, the current point is assumed to be
michael@0:     // the point adjacent to the top left corner on the top
michael@0:     // horizontal.  Note that corner indices start at the top left and
michael@0:     // continue clockwise, whereas in our loop i = 0 refers to the top
michael@0:     // right corner.
michael@0:     //
michael@0:     // When going CCW, the control points are swapped, and the first
michael@0:     // corner that's drawn is the top left (along with the top segment).
michael@0:     //
michael@0:     // There is considerable latitude in how one chooses the four
michael@0:     // control points for a Bezier curve approximation to an ellipse.
michael@0:     // For the overall path to be continuous and show no corner at the
michael@0:     // endpoints of the arc, points 0 and 3 must be at the ends of the
michael@0:     // straight segments of the rectangle; points 0, 1, and C must be
michael@0:     // collinear; and points 3, 2, and C must also be collinear.  This
michael@0:     // leaves only two free parameters: the ratio of the line segments
michael@0:     // 01 and 0C, and the ratio of the line segments 32 and 3C.  See
michael@0:     // the following papers for extensive discussion of how to choose
michael@0:     // these ratios:
michael@0:     //
michael@0:     //   Dokken, Tor, et al. "Good approximation of circles by
michael@0:     //      curvature-continuous Bezier curves."  Computer-Aided
michael@0:     //      Geometric Design 7(1990) 33--41.
michael@0:     //   Goldapp, Michael. "Approximation of circular arcs by cubic
michael@0:     //      polynomials." Computer-Aided Geometric Design 8(1991) 227--238.
michael@0:     //   Maisonobe, Luc. "Drawing an elliptical arc using polylines,
michael@0:     //      quadratic, or cubic Bezier curves."
michael@0:     //      http://www.spaceroots.org/documents/ellipse/elliptical-arc.pdf
michael@0:     //
michael@0:     // We follow the approach in section 2 of Goldapp (least-error,
michael@0:     // Hermite-type approximation) and make both ratios equal to
michael@0:     //
michael@0:     //          2   2 + n - sqrt(2n + 28)
michael@0:     //  alpha = - * ---------------------
michael@0:     //          3           n - 4
michael@0:     //
michael@0:     // where n = 3( cbrt(sqrt(2)+1) - cbrt(sqrt(2)-1) ).
michael@0:     //
michael@0:     // This is the result of Goldapp's equation (10b) when the angle
michael@0:     // swept out by the arc is pi/2, and the parameter "a-bar" is the
michael@0:     // expression given immediately below equation (21).
michael@0:     //
michael@0:     // Using this value, the maximum radial error for a circle, as a
michael@0:     // fraction of the radius, is on the order of 0.2 x 10^-3.
michael@0:     // Neither Dokken nor Goldapp discusses error for a general
michael@0:     // ellipse; Maisonobe does, but his choice of control points
michael@0:     // follows different constraints, and Goldapp's expression for
michael@0:     // 'alpha' gives much smaller radial error, even for very flat
michael@0:     // ellipses, than Maisonobe's equivalent.
michael@0:     //
michael@0:     // For the various corners and for each axis, the sign of this
michael@0:     // constant changes, or it might be 0 -- it's multiplied by the
michael@0:     // appropriate multiplier from the list before using.
michael@0: 
michael@0:   if (mCairo) {
michael@0:     const gfxFloat alpha = 0.55191497064665766025;
michael@0: 
michael@0:     typedef struct { gfxFloat a, b; } twoFloats;
michael@0: 
michael@0:     twoFloats cwCornerMults[4] = { { -1,  0 },
michael@0:                                    {  0, -1 },
michael@0:                                    { +1,  0 },
michael@0:                                    {  0, +1 } };
michael@0:     twoFloats ccwCornerMults[4] = { { +1,  0 },
michael@0:                                     {  0, -1 },
michael@0:                                     { -1,  0 },
michael@0:                                     {  0, +1 } };
michael@0: 
michael@0:     twoFloats *cornerMults = draw_clockwise ? cwCornerMults : ccwCornerMults;
michael@0: 
michael@0:     gfxPoint pc, p0, p1, p2, p3;
michael@0: 
michael@0:     if (draw_clockwise)
michael@0:         cairo_move_to(mCairo, rect.X() + corners[NS_CORNER_TOP_LEFT].width, rect.Y());
michael@0:     else
michael@0:         cairo_move_to(mCairo, rect.X() + rect.Width() - corners[NS_CORNER_TOP_RIGHT].width, rect.Y());
michael@0: 
michael@0:     NS_FOR_CSS_CORNERS(i) {
michael@0:         // the corner index -- either 1 2 3 0 (cw) or 0 3 2 1 (ccw)
michael@0:         mozilla::css::Corner c = mozilla::css::Corner(draw_clockwise ? ((i+1) % 4) : ((4-i) % 4));
michael@0: 
michael@0:         // i+2 and i+3 respectively.  These are used to index into the corner
michael@0:         // multiplier table, and were deduced by calculating out the long form
michael@0:         // of each corner and finding a pattern in the signs and values.
michael@0:         int i2 = (i+2) % 4;
michael@0:         int i3 = (i+3) % 4;
michael@0: 
michael@0:         pc = rect.AtCorner(c);
michael@0: 
michael@0:         if (corners[c].width > 0.0 && corners[c].height > 0.0) {
michael@0:             p0.x = pc.x + cornerMults[i].a * corners[c].width;
michael@0:             p0.y = pc.y + cornerMults[i].b * corners[c].height;
michael@0: 
michael@0:             p3.x = pc.x + cornerMults[i3].a * corners[c].width;
michael@0:             p3.y = pc.y + cornerMults[i3].b * corners[c].height;
michael@0: 
michael@0:             p1.x = p0.x + alpha * cornerMults[i2].a * corners[c].width;
michael@0:             p1.y = p0.y + alpha * cornerMults[i2].b * corners[c].height;
michael@0: 
michael@0:             p2.x = p3.x - alpha * cornerMults[i3].a * corners[c].width;
michael@0:             p2.y = p3.y - alpha * cornerMults[i3].b * corners[c].height;
michael@0: 
michael@0:             cairo_line_to (mCairo, p0.x, p0.y);
michael@0:             cairo_curve_to (mCairo,
michael@0:                             p1.x, p1.y,
michael@0:                             p2.x, p2.y,
michael@0:                             p3.x, p3.y);
michael@0:         } else {
michael@0:             cairo_line_to (mCairo, pc.x, pc.y);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     cairo_close_path (mCairo);
michael@0:   } else {
michael@0:     EnsurePathBuilder();
michael@0:     Size radii[] = { ToSize(corners[NS_CORNER_TOP_LEFT]),
michael@0:                      ToSize(corners[NS_CORNER_TOP_RIGHT]),
michael@0:                      ToSize(corners[NS_CORNER_BOTTOM_RIGHT]),
michael@0:                      ToSize(corners[NS_CORNER_BOTTOM_LEFT]) };
michael@0:     AppendRoundedRectToPath(mPathBuilder, ToRect(rect), radii, draw_clockwise);
michael@0:   }
michael@0: }
michael@0: 
michael@0: #ifdef MOZ_DUMP_PAINTING
michael@0: void
michael@0: gfxContext::WriteAsPNG(const char* aFile)
michael@0: { 
michael@0:   nsRefPtr<gfxASurface> surf = CurrentSurface();
michael@0:   if (surf) {
michael@0:     surf->WriteAsPNG(aFile);
michael@0:   } else {
michael@0:     NS_WARNING("No surface found!");
michael@0:   }
michael@0: }
michael@0: 
michael@0: void 
michael@0: gfxContext::DumpAsDataURL()
michael@0: { 
michael@0:   nsRefPtr<gfxASurface> surf = CurrentSurface();
michael@0:   if (surf) {
michael@0:     surf->DumpAsDataURL();
michael@0:   } else {
michael@0:     NS_WARNING("No surface found!");
michael@0:   }
michael@0: }
michael@0: 
michael@0: void 
michael@0: gfxContext::CopyAsDataURL()
michael@0: { 
michael@0:   nsRefPtr<gfxASurface> surf = CurrentSurface();
michael@0:   if (surf) {
michael@0:     surf->CopyAsDataURL();
michael@0:   } else {
michael@0:     NS_WARNING("No surface found!");
michael@0:   }
michael@0: }
michael@0: #endif
michael@0: 
michael@0: void
michael@0: gfxContext::EnsurePath()
michael@0: {
michael@0:   if (mPathBuilder) {
michael@0:     mPath = mPathBuilder->Finish();
michael@0:     mPathBuilder = nullptr;
michael@0:   }
michael@0: 
michael@0:   if (mPath) {
michael@0:     if (mTransformChanged) {
michael@0:       Matrix mat = mTransform;
michael@0:       mat.Invert();
michael@0:       mat = mPathTransform * mat;
michael@0:       mPathBuilder = mPath->TransformedCopyToBuilder(mat, CurrentState().fillRule);
michael@0:       mPath = mPathBuilder->Finish();
michael@0:       mPathBuilder = nullptr;
michael@0: 
michael@0:       mTransformChanged = false;
michael@0:     }
michael@0: 
michael@0:     if (CurrentState().fillRule == mPath->GetFillRule()) {
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     mPathBuilder = mPath->CopyToBuilder(CurrentState().fillRule);
michael@0: 
michael@0:     mPath = mPathBuilder->Finish();
michael@0:     mPathBuilder = nullptr;
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   EnsurePathBuilder();
michael@0:   mPath = mPathBuilder->Finish();
michael@0:   mPathBuilder = nullptr;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::EnsurePathBuilder()
michael@0: {
michael@0:   if (mPathBuilder && !mTransformChanged) {
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   if (mPath) {
michael@0:     if (!mTransformChanged) {
michael@0:       mPathBuilder = mPath->CopyToBuilder(CurrentState().fillRule);
michael@0:       mPath = nullptr;
michael@0:     } else {
michael@0:       Matrix invTransform = mTransform;
michael@0:       invTransform.Invert();
michael@0:       Matrix toNewUS = mPathTransform * invTransform;
michael@0:       mPathBuilder = mPath->TransformedCopyToBuilder(toNewUS, CurrentState().fillRule);
michael@0:     }
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   DebugOnly<PathBuilder*> oldPath = mPathBuilder.get();
michael@0: 
michael@0:   if (!mPathBuilder) {
michael@0:     mPathBuilder = mDT->CreatePathBuilder(CurrentState().fillRule);
michael@0: 
michael@0:     if (mPathIsRect) {
michael@0:       mPathBuilder->MoveTo(mRect.TopLeft());
michael@0:       mPathBuilder->LineTo(mRect.TopRight());
michael@0:       mPathBuilder->LineTo(mRect.BottomRight());
michael@0:       mPathBuilder->LineTo(mRect.BottomLeft());
michael@0:       mPathBuilder->Close();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (mTransformChanged) {
michael@0:     // This could be an else if since this should never happen when
michael@0:     // mPathBuilder is nullptr and mPath is nullptr. But this way we can
michael@0:     // assert if all the state is as expected.
michael@0:     MOZ_ASSERT(oldPath);
michael@0:     MOZ_ASSERT(!mPathIsRect);
michael@0: 
michael@0:     Matrix invTransform = mTransform;
michael@0:     invTransform.Invert();
michael@0:     Matrix toNewUS = mPathTransform * invTransform;
michael@0: 
michael@0:     RefPtr<Path> path = mPathBuilder->Finish();
michael@0:     mPathBuilder = path->TransformedCopyToBuilder(toNewUS, CurrentState().fillRule);
michael@0:   }
michael@0: 
michael@0:   mPathIsRect = false;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::FillAzure(Float aOpacity)
michael@0: {
michael@0:   AzureState &state = CurrentState();
michael@0: 
michael@0:   CompositionOp op = GetOp();
michael@0: 
michael@0:   if (mPathIsRect) {
michael@0:     MOZ_ASSERT(!mTransformChanged);
michael@0: 
michael@0:     if (state.opIsClear) {
michael@0:       mDT->ClearRect(mRect);
michael@0:     } else if (op == CompositionOp::OP_SOURCE) {
michael@0:       // Emulate cairo operator source which is bound by mask!
michael@0:       mDT->ClearRect(mRect);
michael@0:       mDT->FillRect(mRect, GeneralPattern(this), DrawOptions(aOpacity));
michael@0:     } else {
michael@0:       mDT->FillRect(mRect, GeneralPattern(this), DrawOptions(aOpacity, op, state.aaMode));
michael@0:     }
michael@0:   } else {
michael@0:     EnsurePath();
michael@0: 
michael@0:     NS_ASSERTION(!state.opIsClear, "We shouldn't be clearing complex paths!");
michael@0: 
michael@0:     mDT->Fill(mPath, GeneralPattern(this), DrawOptions(aOpacity, op, state.aaMode));
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::PushClipsToDT(DrawTarget *aDT)
michael@0: {
michael@0:   // Tricky, we have to restore all clips -since the last time- the clip
michael@0:   // was reset. If we didn't reset the clip, just popping the clips we
michael@0:   // added was fine.
michael@0:   unsigned int lastReset = 0;
michael@0:   for (int i = mStateStack.Length() - 2; i > 0; i--) {
michael@0:     if (mStateStack[i].clipWasReset) {
michael@0:       lastReset = i;
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Don't need to save the old transform, we'll be setting a new one soon!
michael@0: 
michael@0:   // Push all clips from the last state on the stack where the clip was
michael@0:   // reset to the clip before ours.
michael@0:   for (unsigned int i = lastReset; i < mStateStack.Length() - 1; i++) {
michael@0:     for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
michael@0:       aDT->SetTransform(mStateStack[i].pushedClips[c].transform * GetDeviceTransform());
michael@0:       if (mStateStack[i].pushedClips[c].path) {
michael@0:         aDT->PushClip(mStateStack[i].pushedClips[c].path);
michael@0:       } else {
michael@0:         aDT->PushClipRect(mStateStack[i].pushedClips[c].rect);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: CompositionOp
michael@0: gfxContext::GetOp()
michael@0: {
michael@0:   if (CurrentState().op != CompositionOp::OP_SOURCE) {
michael@0:     return CurrentState().op;
michael@0:   }
michael@0: 
michael@0:   AzureState &state = CurrentState();
michael@0:   if (state.pattern) {
michael@0:     if (state.pattern->IsOpaque()) {
michael@0:       return CompositionOp::OP_OVER;
michael@0:     } else {
michael@0:       return CompositionOp::OP_SOURCE;
michael@0:     }
michael@0:   } else if (state.sourceSurface) {
michael@0:     if (state.sourceSurface->GetFormat() == SurfaceFormat::B8G8R8X8) {
michael@0:       return CompositionOp::OP_OVER;
michael@0:     } else {
michael@0:       return CompositionOp::OP_SOURCE;
michael@0:     }
michael@0:   } else {
michael@0:     if (state.color.a > 0.999) {
michael@0:       return CompositionOp::OP_OVER;
michael@0:     } else {
michael@0:       return CompositionOp::OP_SOURCE;
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: /* SVG font code can change the transform after having set the pattern on the
michael@0:  * context. When the pattern is set it is in user space, if the transform is
michael@0:  * changed after doing so the pattern needs to be converted back into userspace.
michael@0:  * We just store the old pattern transform here so that we only do the work
michael@0:  * needed here if the pattern is actually used.
michael@0:  * We need to avoid doing this when this ChangeTransform comes from a restore,
michael@0:  * since the current pattern and the current transform are both part of the
michael@0:  * state we know the new CurrentState()'s values are valid. But if we assume
michael@0:  * a change they might become invalid since patternTransformChanged is part of
michael@0:  * the state and might be false for the restored AzureState.
michael@0:  */
michael@0: void
michael@0: gfxContext::ChangeTransform(const Matrix &aNewMatrix, bool aUpdatePatternTransform)
michael@0: {
michael@0:   AzureState &state = CurrentState();
michael@0: 
michael@0:   if (aUpdatePatternTransform && (state.pattern || state.sourceSurface)
michael@0:       && !state.patternTransformChanged) {
michael@0:     state.patternTransform = GetDTTransform();
michael@0:     state.patternTransformChanged = true;
michael@0:   }
michael@0: 
michael@0:   if (mPathIsRect) {
michael@0:     Matrix invMatrix = aNewMatrix;
michael@0:     
michael@0:     invMatrix.Invert();
michael@0: 
michael@0:     Matrix toNewUS = mTransform * invMatrix;
michael@0: 
michael@0:     if (toNewUS.IsRectilinear()) {
michael@0:       mRect = toNewUS.TransformBounds(mRect);
michael@0:       mRect.NudgeToIntegers();
michael@0:     } else {
michael@0:       mPathBuilder = mDT->CreatePathBuilder(CurrentState().fillRule);
michael@0:       
michael@0:       mPathBuilder->MoveTo(toNewUS * mRect.TopLeft());
michael@0:       mPathBuilder->LineTo(toNewUS * mRect.TopRight());
michael@0:       mPathBuilder->LineTo(toNewUS * mRect.BottomRight());
michael@0:       mPathBuilder->LineTo(toNewUS * mRect.BottomLeft());
michael@0:       mPathBuilder->Close();
michael@0: 
michael@0:       mPathIsRect = false;
michael@0:     }
michael@0: 
michael@0:     // No need to consider the transform changed now!
michael@0:     mTransformChanged = false;
michael@0:   } else if ((mPath || mPathBuilder) && !mTransformChanged) {
michael@0:     mTransformChanged = true;
michael@0:     mPathTransform = mTransform;
michael@0:   }
michael@0: 
michael@0:   mTransform = aNewMatrix;
michael@0: 
michael@0:   mDT->SetTransform(GetDTTransform());
michael@0: }
michael@0: 
michael@0: Rect
michael@0: gfxContext::GetAzureDeviceSpaceClipBounds()
michael@0: {
michael@0:   unsigned int lastReset = 0;
michael@0:   for (int i = mStateStack.Length() - 1; i > 0; i--) {
michael@0:     if (mStateStack[i].clipWasReset) {
michael@0:       lastReset = i;
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   Rect rect(CurrentState().deviceOffset.x, CurrentState().deviceOffset.y,
michael@0:             Float(mDT->GetSize().width), Float(mDT->GetSize().height));
michael@0:   for (unsigned int i = lastReset; i < mStateStack.Length(); i++) {
michael@0:     for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
michael@0:       AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
michael@0:       if (clip.path) {
michael@0:         Rect bounds = clip.path->GetBounds(clip.transform);
michael@0:         rect.IntersectRect(rect, bounds);
michael@0:       } else {
michael@0:         rect.IntersectRect(rect, clip.transform.TransformBounds(clip.rect));
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return rect;
michael@0: }
michael@0: 
michael@0: Point
michael@0: gfxContext::GetDeviceOffset() const
michael@0: {
michael@0:   return CurrentState().deviceOffset;
michael@0: }
michael@0: 
michael@0: Matrix
michael@0: gfxContext::GetDeviceTransform() const
michael@0: {
michael@0:   Matrix mat;
michael@0:   mat.Translate(-CurrentState().deviceOffset.x, -CurrentState().deviceOffset.y);
michael@0:   return mat;
michael@0: }
michael@0: 
michael@0: Matrix
michael@0: gfxContext::GetDTTransform() const
michael@0: {
michael@0:   Matrix mat = mTransform;
michael@0:   mat._31 -= CurrentState().deviceOffset.x;
michael@0:   mat._32 -= CurrentState().deviceOffset.y;
michael@0:   return mat;
michael@0: }
michael@0: 
michael@0: void
michael@0: gfxContext::PushNewDT(gfxContentType content)
michael@0: {
michael@0:   Rect clipBounds = GetAzureDeviceSpaceClipBounds();
michael@0:   clipBounds.RoundOut();
michael@0: 
michael@0:   clipBounds.width = std::max(1.0f, clipBounds.width);
michael@0:   clipBounds.height = std::max(1.0f, clipBounds.height);
michael@0: 
michael@0:   SurfaceFormat format = gfxPlatform::GetPlatform()->Optimal2DFormatForContent(content);
michael@0: 
michael@0:   RefPtr<DrawTarget> newDT =
michael@0:     mDT->CreateSimilarDrawTarget(IntSize(int32_t(clipBounds.width), int32_t(clipBounds.height)),
michael@0:                                  format);
michael@0: 
michael@0:   if (!newDT) {
michael@0:     NS_WARNING("Failed to create DrawTarget of sufficient size.");
michael@0:     newDT = mDT->CreateSimilarDrawTarget(IntSize(64, 64), format);
michael@0: 
michael@0:     if (!newDT) {
michael@0:       // If even this fails.. we're most likely just out of memory!
michael@0:       NS_ABORT_OOM(BytesPerPixel(format) * 64 * 64);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   Save();
michael@0: 
michael@0:   CurrentState().drawTarget = newDT;
michael@0:   CurrentState().deviceOffset = clipBounds.TopLeft();
michael@0: 
michael@0:   mDT = newDT;
michael@0: }
michael@0: 
michael@0: /**
michael@0:  * Work out whether cairo will snap inter-glyph spacing to pixels.
michael@0:  *
michael@0:  * Layout does not align text to pixel boundaries, so, with font drawing
michael@0:  * backends that snap glyph positions to pixels, it is important that
michael@0:  * inter-glyph spacing within words is always an integer number of pixels.
michael@0:  * This ensures that the drawing backend snaps all of the word's glyphs in the
michael@0:  * same direction and so inter-glyph spacing remains the same.
michael@0:  */
michael@0: void
michael@0: gfxContext::GetRoundOffsetsToPixels(bool *aRoundX, bool *aRoundY)
michael@0: {
michael@0:     *aRoundX = false;
michael@0:     // Could do something fancy here for ScaleFactors of
michael@0:     // AxisAlignedTransforms, but we leave things simple.
michael@0:     // Not much point rounding if a matrix will mess things up anyway.
michael@0:     // Also return false for non-cairo contexts.
michael@0:     if (CurrentMatrix().HasNonTranslation() || mDT) {
michael@0:         *aRoundY = false;
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     // All raster backends snap glyphs to pixels vertically.
michael@0:     // Print backends set CAIRO_HINT_METRICS_OFF.
michael@0:     *aRoundY = true;
michael@0: 
michael@0:     cairo_t *cr = GetCairo();
michael@0:     cairo_scaled_font_t *scaled_font = cairo_get_scaled_font(cr);
michael@0:     // Sometimes hint metrics gets set for us, most notably for printing.
michael@0:     cairo_font_options_t *font_options = cairo_font_options_create();
michael@0:     cairo_scaled_font_get_font_options(scaled_font, font_options);
michael@0:     cairo_hint_metrics_t hint_metrics =
michael@0:         cairo_font_options_get_hint_metrics(font_options);
michael@0:     cairo_font_options_destroy(font_options);
michael@0: 
michael@0:     switch (hint_metrics) {
michael@0:     case CAIRO_HINT_METRICS_OFF:
michael@0:         *aRoundY = false;
michael@0:         return;
michael@0:     case CAIRO_HINT_METRICS_DEFAULT:
michael@0:         // Here we mimic what cairo surface/font backends do.  Printing
michael@0:         // surfaces have already been handled by hint_metrics.  The
michael@0:         // fallback show_glyphs implementation composites pixel-aligned
michael@0:         // glyph surfaces, so we just pick surface/font combinations that
michael@0:         // override this.
michael@0:         switch (cairo_scaled_font_get_type(scaled_font)) {
michael@0: #if CAIRO_HAS_DWRITE_FONT // dwrite backend is not in std cairo releases yet
michael@0:         case CAIRO_FONT_TYPE_DWRITE:
michael@0:             // show_glyphs is implemented on the font and so is used for
michael@0:             // all surface types; however, it may pixel-snap depending on
michael@0:             // the dwrite rendering mode
michael@0:             if (!cairo_dwrite_scaled_font_get_force_GDI_classic(scaled_font) &&
michael@0:                 gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode() ==
michael@0:                     DWRITE_MEASURING_MODE_NATURAL) {
michael@0:                 return;
michael@0:             }
michael@0: #endif
michael@0:         case CAIRO_FONT_TYPE_QUARTZ:
michael@0:             // Quartz surfaces implement show_glyphs for Quartz fonts
michael@0:             if (cairo_surface_get_type(cairo_get_target(cr)) ==
michael@0:                 CAIRO_SURFACE_TYPE_QUARTZ) {
michael@0:                 return;
michael@0:             }
michael@0:         default:
michael@0:             break;
michael@0:         }
michael@0:         // fall through:
michael@0:     case CAIRO_HINT_METRICS_ON:
michael@0:         break;
michael@0:     }
michael@0:     *aRoundX = true;
michael@0:     return;
michael@0: }