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Get surface parameters
#include <gf/gf.h>
gf_surface_info_t *gf_surface_get_info(
gf_surface_t surface,
gf_surface_info_t *info);
- surface
- The handle for the surface.
- info
- The address of a structure that the function can fill with surface information (see below). Do not pass NULL.
gf
This function retrieves surface parameters.
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If the surface ID (SID) is reported as GF_SID_INVALID by this function, then the surface isn't being managed by io-display and therefore can't be shared across process boundaries. |
The info parameter contains information about the surface:
typedef struct {
gf_sid_t sid;
int w;
int h;
gf_format_t format;
unsigned stride;
_uint64 paddr;
_uint8* vaddr;
gf_palette_t palette;
unsigned flags;
} gf_surface_info_t;
It contains at least these parameters:
- sid
- If this surface was allocated by io-display, this field specifies the numerical identifier that is assigned to this surface, which is guaranteed to be unique across the entire device. If the surface was not allocated by io-display (as in the case of gf_surface_attach(), this field is set to a value of GF_SID_INVALID.
- w, h
- The width and height of the surface, in pixels.
- format
- The pixel format of the surface. See gf_format_t for a list of possible pixel formats.
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The format filled in by gf_surface_get_info() will be endian-specific.
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- stride
- The number of bytes per scanline.
- paddr
- The physical address of the surface memory buffer. You should use this only if
the flags member has the GF_SURFACE_PHYS_CONTIG flag bit set.
- vaddr
- Virtual address of the surface memory buffer. You should use this only if the surface was created with the GF_SURFACE_CREATE_CPU_LINEAR_ACCESSIBLE flag bit set.
- palette
- The surface palette, of type gf_palette_t. This member is valid only if the surface format is GF_FORMAT_PAL8.
- flags
- Flags that provide additional information regarding the surface. Valid bits include:
- GF_SURFACE_DISPLAYABLE
- The surface can be displayed via a CRT controller.
- GF_SURFACE_CPU_LINEAR_READABLE
- The CPU can read this surface directly.
- GF_SURFACE_CPU_LINEAR_WRITEABLE
- The CPU can write to this surface directly.
- GF_SURFACE_2D_READABLE
- The surface is read-accessible by the 2D engine.
- GF_SURFACE_3D_READABLE
- The surface is read-accessible by the 3D engine.
- GF_SURFACE_2D_TARGETABLE
- The 2D engine can render into the surface.
- GF_SURFACE_3D_TARGETABLE
- The 3D engine can render into the surface.
- GF_SURFACE_ALPHA_MAP
- The Surface can be used as the alpha map source for 2D rendering
- GF_SURFACE_SCALER_DISPLAYABLE
- The surface can be displayed via a video overlay scaler.
- GF_SURFACE_VMI_TARGETABLE
- Video in hardware can write frames into the surface.
- GF_SURFACE_DMA_SAFE
- The DMA engine can treat the surface memory as one contiguous block.
- GF_SURFACE_PAGE_ALIGNED
- The surface memory starts on a page boundary, and its linear size is a multiple of the page size.
- GF_SURFACE_BYTES_REVERSED
- The byte order is reversed. This is valid only for 16- and 32-bpp surfaces.
- GF_SURFACE_NON_CACHEABLE
- The memory should be mapped noncacheable.
- GF_SURFACE_WT_CACHEABLE
- The memory can be mapped write-through cacheable (but not write-back cacheable).
- GF_SURFACE_PHYS_CONTIG
- The memory is physically contiguous.
- GF_SURFACE_DRIVER_NOT_OWNER
- The driver did not create or allocate this surface.
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In most cases, there is a one-for-one mapping between the
GF_SURFACE_CREATE_xxxx flags that are passed to gf_surface_create() and
gf_surface_create_layer() and the GF_SURFACE_xxxx flags which populate the
gf_surface_info_t.flags member.
These creation flags result in the following:
- GF_SURFACE_CREATE_2D_ACCESSIBLE
- On success, will cause either the
GF_SURFACE_2D_READABLE and/or the GF_SURFACE_2D_TARGETABLE bit(s) to be set.
- GF_SURFACE_CREATE_3D_ACCESSIBLE
- On success, will case either the
GF_SURFACE_3D_READABLE and or the GF_SURFACE_3D_TARGETABLE bits to be set.
Any remaining flags which are returned in the gf_surface_info_t.flags member,
and do not have a corresponding creation flag, are used for additional feedback
requirements only. Any further attempts to create mappings will result in vague understandings
being propagated. |
The address passed in.
QNX Graphics Framework
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
gf_format_t,
gf_palette_t,
gf_surface_attach(),
gf_surface_create(),
gf_surface_create_layer()
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