| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/output/overlay_candidate.h" |
| |
| #include <algorithm> |
| #include <limits> |
| #include "base/logging.h" |
| #include "cc/base/math_util.h" |
| #include "ui/gfx/geometry/rect_conversions.h" |
| #include "ui/gfx/geometry/vector3d_f.h" |
| |
| namespace cc { |
| |
| namespace { |
| // Tolerance for considering axis vector elements to be zero. |
| const SkMScalar kEpsilon = std::numeric_limits<float>::epsilon(); |
| |
| enum Axis { NONE, AXIS_POS_X, AXIS_NEG_X, AXIS_POS_Y, AXIS_NEG_Y }; |
| |
| Axis VectorToAxis(const gfx::Vector3dF& vec) { |
| if (std::abs(vec.z()) > kEpsilon) |
| return NONE; |
| const bool x_zero = (std::abs(vec.x()) <= kEpsilon); |
| const bool y_zero = (std::abs(vec.y()) <= kEpsilon); |
| if (x_zero && !y_zero) |
| return (vec.y() > 0) ? AXIS_POS_Y : AXIS_NEG_Y; |
| else if (y_zero && !x_zero) |
| return (vec.x() > 0) ? AXIS_POS_X : AXIS_NEG_X; |
| else |
| return NONE; |
| } |
| |
| } // namespace |
| |
| OverlayCandidate::OverlayCandidate() |
| : transform(gfx::OVERLAY_TRANSFORM_NONE), |
| format(RGBA_8888), |
| uv_rect(0.f, 0.f, 1.f, 1.f), |
| resource_id(0), |
| plane_z_order(0), |
| overlay_handled(false) {} |
| |
| OverlayCandidate::~OverlayCandidate() {} |
| |
| // static |
| gfx::OverlayTransform OverlayCandidate::GetOverlayTransform( |
| const gfx::Transform& quad_transform, |
| bool y_flipped) { |
| if (!quad_transform.Preserves2dAxisAlignment()) { |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| |
| gfx::Vector3dF x_axis = MathUtil::GetXAxis(quad_transform); |
| gfx::Vector3dF y_axis = MathUtil::GetYAxis(quad_transform); |
| if (y_flipped) { |
| y_axis.Scale(-1); |
| } |
| |
| Axis x_to = VectorToAxis(x_axis); |
| Axis y_to = VectorToAxis(y_axis); |
| |
| if (x_to == AXIS_POS_X && y_to == AXIS_POS_Y) |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| else if (x_to == AXIS_NEG_X && y_to == AXIS_POS_Y) |
| return gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL; |
| else if (x_to == AXIS_POS_X && y_to == AXIS_NEG_Y) |
| return gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL; |
| else if (x_to == AXIS_NEG_Y && y_to == AXIS_POS_X) |
| return gfx::OVERLAY_TRANSFORM_ROTATE_270; |
| else if (x_to == AXIS_NEG_X && y_to == AXIS_NEG_Y) |
| return gfx::OVERLAY_TRANSFORM_ROTATE_180; |
| else if (x_to == AXIS_POS_Y && y_to == AXIS_NEG_X) |
| return gfx::OVERLAY_TRANSFORM_ROTATE_90; |
| else |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| |
| // static |
| gfx::OverlayTransform OverlayCandidate::ModifyTransform( |
| gfx::OverlayTransform in, |
| gfx::OverlayTransform delta) { |
| // There are 8 different possible transforms. We can characterize these |
| // by looking at where the origin moves and the direction the horizontal goes. |
| // (TL=top-left, BR=bottom-right, H=horizontal, V=vertical). |
| // NONE: TL, H |
| // FLIP_VERTICAL: BL, H |
| // FLIP_HORIZONTAL: TR, H |
| // ROTATE_90: TR, V |
| // ROTATE_180: BR, H |
| // ROTATE_270: BL, V |
| // Missing transforms: TL, V & BR, V |
| // Basic combinations: |
| // Flip X & Y -> Rotate 180 (TL,H -> TR,H -> BR,H or TL,H -> BL,H -> BR,H) |
| // Flip X or Y + Rotate 180 -> other flip (eg, TL,H -> TR,H -> BL,H) |
| // Rotate + Rotate simply adds values. |
| // Rotate 90/270 + flip is invalid because we can only have verticals with |
| // the origin in TR or BL. |
| if (delta == gfx::OVERLAY_TRANSFORM_NONE) |
| return in; |
| switch (in) { |
| case gfx::OVERLAY_TRANSFORM_NONE: |
| return delta; |
| case gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL: |
| switch (delta) { |
| case gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL: |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| case gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_180; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| return gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL; |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| break; |
| case gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL: |
| switch (delta) { |
| case gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL: |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| case gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_180; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_90: |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| return gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_270: |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| break; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_90: |
| switch (delta) { |
| case gfx::OVERLAY_TRANSFORM_ROTATE_90: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_180; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_270; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_270: |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| break; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| switch (delta) { |
| case gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL: |
| return gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL; |
| case gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL: |
| return gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_90: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_270; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_270: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_90; |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| break; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_270: |
| switch (delta) { |
| case gfx::OVERLAY_TRANSFORM_ROTATE_90: |
| return gfx::OVERLAY_TRANSFORM_NONE; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_180: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_90; |
| case gfx::OVERLAY_TRANSFORM_ROTATE_270: |
| return gfx::OVERLAY_TRANSFORM_ROTATE_180; |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| break; |
| default: |
| return gfx::OVERLAY_TRANSFORM_INVALID; |
| } |
| } |
| |
| // static |
| gfx::RectF OverlayCandidate::GetOverlayRect( |
| const gfx::Transform& quad_transform, |
| const gfx::Rect& rect) { |
| DCHECK(quad_transform.Preserves2dAxisAlignment()); |
| |
| gfx::RectF float_rect(rect); |
| quad_transform.TransformRect(&float_rect); |
| return float_rect; |
| } |
| |
| } // namespace cc |