Window Transparency Off-Screen Buffer Segmentation

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Solution Overview

Problem

Existing window transparency features in operating systems consume high memory bandwidth due to the need for global layered modes, degrading system response with multiple transparent windows.

Innovation Solution

Implementing a system that allows window transparency on a window-by-window basis, using off-screen memory for transparent windows, and enabling transparency only when needed, with user-controlled settings and message hook programs to manage transparency without relying on the operating system's layered mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If global layered mode is used for window transparency, then transparency functionality is provided, but memory bandwidth is heavily consumed and system response degrades

Engineering Contradiction:

Improvetransparency functionalityVSAvoidsystem response

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent divides the transparency functionality into individual window-based implementations rather than global layered mode. Each transparent window is handled independently with its own off-screen buffer, allowing selective transparency on a per-window basis without requiring system-wide layered mode, thus reducing overall memory bandwidth consumption while maintaining transparency capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies transparency locally to specific windows rather than globally across all windows. By using off-screen buffers only for windows that need transparency and blending them selectively with the desktop background, the system provides transparency where needed without the performance penalty of global layered mode.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If multiple windows are made transparent simultaneously, then transparency versatility is improved, but memory bandwidth consumption increases

Engineering Contradiction:

Improvetransparency versatilityVSAvoidmemory bandwidth

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

Each transparent window is processed independently with its own off-screen buffer, allowing multiple windows to be transparent simultaneously without requiring all windows to be processed through the expensive global layered mode path. This segmentation enables selective transparency that scales better with the number of transparent windows.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies transparency partially to only those windows that require it, rather than applying global layered mode to all windows. This partial action approach reduces memory bandwidth consumption by avoiding unnecessary blending operations for opaque windows while still providing transparency versatility for windows that need it.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8659615B2System and method for providing transparent windows of a display

Publication Date: 2014.02.25 NVIDIA CORP

AI summary

Systems and methods for managing window transparency for a computer display, making windows wholly transparent or semi-transparent, on a window-by-window basis. Window transparency is triggered by monitoring messages exchanged between a program and an operating system, or by a user action. Upon detection of a first message indicating that a window of the display should be transparent, a layered display mode for the window is initiated. Upon detection of a second message indicating that the window should no longer be transparent, the layered display mode for the window is terminated. The layered mode can be controlled by the operating system or by a graphics processor.