| // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MONITOR_RECONFIGURE_RESOLUTION_SELECTOR_H_ |
| #define MONITOR_RECONFIGURE_RESOLUTION_SELECTOR_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| |
| namespace monitor_reconfig { |
| |
| // ResolutionSelector takes the sets of resolutions supported by the |
| // built-in and external displays as input and attempts to choose a shared |
| // resolution that will work well on both devices. |
| class ResolutionSelector { |
| public: |
| // A single mode supported by a device, equivalent to the XRRModeInfo |
| // struct. |
| struct Mode { |
| Mode(int width, int height, std::string name, int id) |
| : width(width), |
| height(height), |
| name(name), |
| id(id) { |
| } |
| |
| Mode() |
| : width(0), |
| height(0), |
| name(""), |
| id(0) { |
| } |
| // Mode's dimensions. |
| int width; |
| int height; |
| |
| // Mode's name from XRandR. This uniquely describes the mode and can |
| // be used to set the devices's resolution later. |
| std::string name; |
| |
| // The mode id, used for setting this mode. |
| unsigned id; |
| }; |
| |
| // Maximum screen size for the external output at which we assume that |
| // it's a projector (as opposed to a monitor) and try to find a size that |
| // will also fit on the LCD display. Above this, we just use the |
| // external output's maximum resolution, even if it doesn't fit on the |
| // LCD. |
| static const int kMaxProjectorPixels; |
| |
| ResolutionSelector() {} |
| ~ResolutionSelector() {} |
| |
| // Comparator used to sort Mode objects. |
| // Returns true if |mode_a| has more pixels than |mode_b| and false otherwise. |
| class ModeResolutionComparator { |
| public: |
| bool operator()(const Mode& mode_a, const Mode& mode_b) const { |
| return mode_a.width * mode_a.height > mode_b.width * mode_b.height; |
| } |
| }; |
| |
| // Find the "best" resolutions for various outputs. |
| // Returns the modes for both screens and the total screen resolution. |
| bool FindBestResolutions( |
| const std::vector<Mode>& lcd_modes, |
| const std::vector<Mode>& external_modes, |
| Mode* lcd_resolution, |
| Mode* external_resolution, |
| Mode* screen_resolution); |
| |
| private: |
| // Find resolutions to use that are reasonably close together. |
| // |larger_device_modes| and |smaller_device_modes| should be sorted by |
| // descending resolution. We choose the highest resolution from |
| // |smaller_device_modes| and the lowest resolution from |larger_device_modes| |
| // that's at least as high as the resolution from the smaller device. |
| // |screen_resolution| gets set to |smaller_resolution| to avoid clipping. |
| bool FindNearestResolutions( |
| const std::vector<Mode>& larger_device_modes, |
| const std::vector<Mode>& smaller_device_modes, |
| Mode* larger_resolution, |
| Mode* smaller_resolution, |
| Mode* screen_resolution); |
| |
| DISALLOW_COPY_AND_ASSIGN(ResolutionSelector); |
| }; |
| |
| } // namespace monitor_reconfig |
| |
| #endif // MONITOR_RECONFIGURE_RESOLUTION_SELECTOR_H_ |