Abstract: A method for sorting graphical objects having an assigned depth coordinate, wherein at least two sets of graphical objects are requested to be drawn, each set comprising at least two graphical objects having a different depth coordinate and a request to select at least one set to sort is received, wherein the request covers fewer than all sets whereby sorting of the graphical objects of each selected set, is executed within the set, according to depth coordinates of the graphical objects.

Abstract: In a method for color interpolation between two colors, each interpolated color between a first color having at least two color components and a second color having at least two color components, is defined by copying at least one color component from a corresponding color component of a neighboring color and calculating at least one other color component.

Abstract: In a method for rotating geometric shape having an assigned texture image, a two dimensional outline of a rotated source geometric shape is defined by performing its perspective projection onto a two dimensional plane. Then, according to the method, the two dimensional outline is split into intermediate rectangles in places where pixel of each line non-parallel to the rotation axis of the two dimensional outline changes coordinates and for each intermediate rectangle the steps of finding a corresponding part of the texture image taking perspective correction into account. One of the last steps executes copying with scaling a corresponding part of the texture image in order to fit it into the intermediate rectangle.

Abstract: A method for drawing geometric shapes comprises the steps of obtaining a request to draw at least two geometric shapes, each having assigned a depth coordinate and at least one having the depth coordinate variable across its surface, dividing the geometric shapes into rectangles such that each rectangle has a constant depth coordinate, sorting the rectangles according to the depth coordinate value and drawing the rectangles in the sorted order so as to form an output image.