Screen blit types

Types of blit attributes.

Synopsis:

#include <screen/screen.h>
 
enum {
      SCREEN_BLIT_END = 0   
      SCREEN_BLIT_SOURCE_X = 1   
      SCREEN_BLIT_SOURCE_Y = 2   
      SCREEN_BLIT_SOURCE_WIDTH = 3   
      SCREEN_BLIT_SOURCE_HEIGHT = 4   
      SCREEN_BLIT_DESTINATION_X = 5   
      SCREEN_BLIT_DESTINATION_Y = 6   
      SCREEN_BLIT_DESTINATION_WIDTH = 7   
      SCREEN_BLIT_DESTINATION_HEIGHT = 8   
      SCREEN_BLIT_GLOBAL_ALPHA = 9   
      SCREEN_BLIT_TRANSPARENCY = 10   
      SCREEN_BLIT_SCALE_QUALITY = 11   
      SCREEN_BLIT_COLOR = 12   
};

Since:

BlackBerry 10.0.0

Data:

SCREEN_BLIT_END
Used to terminate the token-value pairs in an attribute list.
SCREEN_BLIT_SOURCE_X
The horizontal position of the rectangle in the source buffer.

The offset is the distance, in pixels, from the left edge of the source buffer. If this attribute is not specified, then a default of 0 will be used.

SCREEN_BLIT_SOURCE_Y
The vertical position of the rectangle in the source buffer.

The offset is the distance, in pixels, from the top edge of the source buffer. If this attribute is not specified, then a default of 0 will be used.

SCREEN_BLIT_SOURCE_WIDTH
The width, in pixels, of the rectangle in the source buffer.

If this attribute is not specified, then the source buffer width will be used. The horizontal and vertical scale factors don't have to be equal. It is acceptable to specify a source width that is larger than the destination width while the source height is smaller than the destination height, and vice versa.

SCREEN_BLIT_SOURCE_HEIGHT
The height, in pixels, of the rectangle in the source buffer.

If this attribute is not specified, then the source buffer height will be used. The horizontal and vertical scale factors don't have to be equal. It is acceptable to specify a source width that is larger than the destination width while the source height is smaller than the destination height, and vice versa.

SCREEN_BLIT_DESTINATION_X
The horizontal position of the rectangle in the destination buffer.

The offset is the distance, in pixels, from the left edge of the destination buffer. If this attribute is not specified, then a default of 0 will be used.

SCREEN_BLIT_DESTINATION_Y
The vertical position of the rectangle in the destination buffer.

The offset is the distance, in pixels, from the top edge of the destination buffer. If this attribute is not specified, then a default of 0 will be used.

SCREEN_BLIT_DESTINATION_WIDTH
The width, in pixels, of the rectangle in the destination buffer.

The width does not have to match the source width. If the destination width is larger, the source rectangle will be stretched. If the destination width is smaller than the source width, the source rectangle will be compressed. If this attribute is not specified, then the destination buffer width will be used.

SCREEN_BLIT_DESTINATION_HEIGHT
The height, in pixels, of the rectangle in the destination buffer.

The height does not have to match the source height. If the destination height is larger, the source rectangle will be stretched. If the destination height is smaller than the source height, the source rectangle will be compressed. If this attribute is not specified, then the destination buffer height will be used.

SCREEN_BLIT_GLOBAL_ALPHA
A global transparency value that is used to blend the source onto the destination.

If this attribute is not specified, then a default of 255 will be used; this default indicates that no global transparency will be applied to the source.

SCREEN_BLIT_TRANSPARENCY
A transparency operation.

The transparency setting defines how the alpha channel, if present, is used to combine the source and destination pixels. The transparency values must be of type Screen transparency types. If this attribute is not specified, then a default of SCREEN_TRANSPARENCY_NONE will be used.

SCREEN_BLIT_SCALE_QUALITY
A scale quality value.

The scale quality setting defines the type and amount of filtering applied when scaling is required. If the source and destination rectangles are identical in size, the scale quality setting is not used. The scale quality value must be of type Screen scale quality types. If this attribute is not specified, then a default of SCREEN_QUALITY_NORMAL will be used.

SCREEN_BLIT_COLOR
The color used by the blit operation.

The color format is red bits 16 to 23, green in bits 8 to 15 and blue in bits 0 to 7. If this attribute is not specified, then a default of #ffffff (white) will be used.

Library:

libscreen (For the qcc command, use the -l screen option to link against this library)

Description:

Last modified: 2014-05-14



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