Method and apparatus for transforming images to accommodate screen orientation

Abstract

A method and apparatus for transforming a display image on a display from a first orientation to a second orientation, the method having the steps of: breaking up the display image into multiple sub-images; and transforming each of the multiple sub-images individually, the transforming step including selecting a pixel, determining a transformed location for the pixel, and writing the pixel to a display buffer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present application will be better understood with reference to the drawings, in which:

FIG. 1 is a schematic view of an exemplary mobile device;

FIG. 2 is a schematic view of a display showing a first row of cache lines oriented for a landscape format addressing;

FIG. 3 is an exemplary display showing a first row of cache lines in which the pixels are configured to be oriented in a portrait format;

FIG. 4 is an exemplary display showing a first row of cache lines in which the pixels are configured to be oriented in a landscape format, with the display broken down into multiple images;

FIG. 5 is an exemplary display showing a first row of cache lines in which the pixels are configured to be oriented in a portrait format, with the display broken down into multiple images;

FIG. 6 is an exemplary display showing a first row of cache lines in which the pixels are configured to be oriented in a landscape format, with the display broken down into multiple images;

FIG. 7 is an exemplary display showing a first row of cache lines in which the pixels are configured to be oriented in a portrait format, with the display broken down into multiple images;

FIG. 8 is a flow chart of a method of the present application;

FIG. 9 is an alternative method where the number of images a display is to be broken into is determined prior to a transformation;

FIG. 10 is a schematic view of an exemplary client/host architecture of a mobile device that can be used in accordance with a preferred embodiment; and

FIG. 11 is a schematic view of the mobile device of FIG. 10.

Claims

1. A method for transforming a display image from a first orientation to a second orientation, the method comprising the steps of: a) breaking up the display image into multiple sub-images; andb) transforming each of said multiple sub-images individually, said transforming step including selecting a pixel, determining a transformed location for said pixel, and writing the pixel to a display buffer.

2. The method of claim 1, wherein the display image is on a mobile device.

3. The method of claim 2, wherein the mobile device includes a predetermined cache size.

4. The method of claim 3, wherein the breaking up step includes finding a sub-image size that fits into said cache without causing cache misses.

5. The method of claim 4, wherein said sub-image size is determined based on a number of bits for each pixel and the number of pixels in a row of the sub-image.

6. The method of claim 1, wherein the breaking up step breaks the display image into two sub-images.

7. The method of claim 1, wherein said breaking up step creates multiple sub-images, each sub-image having the same size.

8. The method of claim 1, wherein said breaking up step creates multiple sub-images having differing sizes.

9. The method of claim 1, wherein the first orientation is one of portrait or landscape, and the second orientation is the other of portrait or landscape.

10. The method of claim 9, wherein said transforming step uses a top left corner as a landscape reference and a top right corner as a portrait reference.

11. A mobile device adapted to transform a display image from a first orientation to a second orientation, the mobile device having a radio subsystem including a radio adapted to communicate with a network; a radio processor having a digital signal processor and adapted to interact with said radio subsystem; memory; a user interface; a processor adapted to run user applications and interact with the memory, the radio and the user interface and adapted to run applications, the mobile device characterized by having means for: a) breaking up the display image into multiple sub-images; andb) transforming each of said multiple sub-images individually, said transforming step including selecting a pixel, determining a transformed location for said pixel, and writing the pixel to a display buffer.

12. The mobile device of claim 11, wherein the mobile device includes a cache with a predetermined cache size.

13. The mobile device of claim 12, wherein the means for breaking up includes means for finding a sub-image size that fits into said cache without causing cache misses.

14. The mobile device of claim 13, wherein said sub-image size is determined based on a number of bits for each pixel and the number of pixels in a row of the image.

15. The mobile device of claim 11, wherein the means for breaking up is adapted to break the display image into two sub-images.

16. The mobile device of claim 11, wherein the means for breaking up is adapted to create multiple sub-images, each sub-image having the same size.

17. The mobile device of claim 11, wherein the means for breaking up is adapted to create multiple sub-images having differing sizes.

18. The mobile device of claim 11, wherein the first orientation is one of portrait or landscape, and the second orientation is the other of portrait or landscape.

19. The mobile device of claim 18, wherein said means for transforming is adapted to use a top left corner as a landscape reference and a top right corner as a portrait reference.