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disp_vid_channel_caps_t

General capabilities of a video scaler

Synopsis:

#include <vid.h>

typedef struct {
    unsigned short size;
    unsigned short reserved0;
    unsigned       flags;
    unsigned       format;
    int            src_max_x;
    int            src_max_y;
    int            max_mag_factor_x;
    int            max_mag_factor_y;
    int            max_shrink_factor_x;
    int            max_shrink_factor_y;
    unsigned       reserved [8];
} disp_vid_channel_caps_t;

Description:

The disp_vid_channel_caps_t structure describes the general capabilities of a video scaler for a given format. The members include:

size

The size of this structure.

reserved0, reserved

Reserved, don't examine or modify.

flags

Flags that indicate the capabilities:

• DISP_VID_CAP_SRC_CHROMA_KEY -- the video viewport supports chroma-keying on frame data.
• DISP_VID_CAP_DST_CHROMA_KEY -- the video viewport supports chroma-keying on desktop data.
• DISP_VID_CAP_BUSMASTER -- the scaler device can bus-master the data from system RAM.
• DISP_VID_CAP_DOUBLE_BUFFER -- the scaler channel can be double-buffered.
• DISP_VID_CAP_BRIGHTNESS_ADJUST -- the brightness of the video viewport can be adjusted.
• DISP_VID_CAP_CONTRAST_ADJUST -- the contrast of the video viewport can be adjusted.

format

The pixel format; see "Pixel formats" in the Writing a Graphics Driver chapter.

src_max_x, src_max_y

The maximum width and height of source frames.

max_mag_factor_x, max_mag_factor_y

The magnification -- -1 means cannot scale upwards.

max_shrink_factor_x, max_shrink_factor_y

1 means cannot scale downwards.

Classification:

Photon

See also:

disp_vidfuncs_t