mirror of
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daace1aac5
These match their alpha counterparts, apart from not setting the alpha bit. This allows our internal mashinery to more easily distinguish whether we need a slow alpha-pass during rendering or not. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1810>
345 lines
14 KiB
C
345 lines
14 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2008,2009 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_PIXEL_FORMAT_H__
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#define __COGL_PIXEL_FORMAT_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <cogl/cogl-defines.h>
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#include <cogl/cogl-macros.h>
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#include <glib.h>
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#include <glib-object.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-pixel-format
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* @short_description: Pixel formats supported by Cogl
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*
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* The pixel format of an image descrbes how the bits of each pixel are
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* represented in memory. For example: an image can be laid out as one long
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* sequence of pixels, where each pixel is a sequence of 8 bits of Red, Green
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* and Blue. The amount of bits that are used can be different for each pixel
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* format, as well as the components (for example an Alpha layer to include
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* transparency, or non_RGBA).
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*
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* Other examples of factors that can influence the layout in memory are the
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* system's endianness.
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*/
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#define COGL_A_BIT (1 << 4)
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#define COGL_BGR_BIT (1 << 5)
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#define COGL_AFIRST_BIT (1 << 6)
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#define COGL_PREMULT_BIT (1 << 7)
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#define COGL_DEPTH_BIT (1 << 8)
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#define COGL_STENCIL_BIT (1 << 9)
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/* XXX: Notes to those adding new formats here...
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*
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* First this diagram outlines how we allocate the 32bits of a
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* CoglPixelFormat currently...
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*
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* 6 bits for flags
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* |-----|
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* enum unused 4 bits for the bytes-per-pixel
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* and component alignment info
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* |------| |-------------| |--|
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* 00000000 xxxxxxxx xxxxxxSD PFBA0000
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* ^ stencil
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* ^ depth
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* ^ premult
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* ^ alpha first
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* ^ bgr order
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* ^ has alpha
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*
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* The most awkward part about the formats is how we use the last 4
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* bits to encode the bytes per pixel and component alignment
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* information. Ideally we should have had 3 bits for the bpp and a
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* flag for alignment but we didn't plan for that in advance so we
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* instead use a small lookup table to query the bpp and whether the
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* components are byte aligned or not.
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*
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* The mapping is the following (see discussion on bug #660188):
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*
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* 0 = undefined
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* 1, 8 = 1 bpp (e.g. A_8, G_8)
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* 2 = 3 bpp, aligned (e.g. 888)
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* 3 = 4 bpp, aligned (e.g. 8888)
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* 4-6 = 2 bpp, not aligned (e.g. 565, 4444, 5551)
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* 7 = YUV: undefined bpp, undefined alignment
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* 9 = 2 bpp, aligned
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* 10 = depth, aligned (8, 16, 24, 32, 32f)
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* 11 = 8 bpp fp16
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* 12 = 3 bpp, not aligned
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* 13 = 4 bpp, not aligned (e.g. 2101010)
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* 14-15 = undefined
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*
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* Note: the gap at 10-11 is just because we wanted to maintain that
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* all non-aligned formats have the third bit set in case that's
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* useful later.
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*
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* Since we don't want to waste bits adding more and more flags, we'd
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* like to see most new pixel formats that can't be represented
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* uniquely with the existing flags in the least significant byte
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* simply be enumerated with sequential values in the most significant
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* enum byte.
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*
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* Note: Cogl avoids exposing any padded XRGB or RGBX formats and
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* instead we leave it up to applications to decided whether they
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* consider the A component as padding or valid data. We shouldn't
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* change this policy without good reasoning.
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*
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* So to add a new format:
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* 1) Use the mapping table above to figure out what to but in
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* the lowest nibble.
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* 2) OR in the COGL_PREMULT_BIT, COGL_AFIRST_BIT, COGL_A_BIT and
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* COGL_BGR_BIT flags as appropriate.
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* 3) If the result is not yet unique then also combine with an
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* increment of the last sequence number in the most significant
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* byte.
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*
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* The last sequence number used was 0 (i.e. no formats currently need
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* a sequence number)
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* Update this note whenever a new sequence number is used.
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*/
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/**
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* CoglPixelFormat:
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* @COGL_PIXEL_FORMAT_ANY: Any format
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* @COGL_PIXEL_FORMAT_A_8: 8 bits alpha mask
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* @COGL_PIXEL_FORMAT_RG_88: RG, 16 bits. Note that red-green textures
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* are only available if %COGL_FEATURE_ID_TEXTURE_RG is advertised.
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* See cogl_texture_set_components() for details.
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* @COGL_PIXEL_FORMAT_RGB_565: RGB, 16 bits
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* @COGL_PIXEL_FORMAT_RGBA_4444: RGBA, 16 bits
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* @COGL_PIXEL_FORMAT_RGBA_5551: RGBA, 16 bits
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* @COGL_PIXEL_FORMAT_YUV: Not currently supported
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* @COGL_PIXEL_FORMAT_G_8: Single luminance component
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* @COGL_PIXEL_FORMAT_RGB_888: RGB, 24 bits
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* @COGL_PIXEL_FORMAT_BGR_888: BGR, 24 bits
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* @COGL_PIXEL_FORMAT_RGBA_8888: RGBA, 32 bits
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* @COGL_PIXEL_FORMAT_BGRA_8888: BGRA, 32 bits
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* @COGL_PIXEL_FORMAT_ARGB_8888: ARGB, 32 bits
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* @COGL_PIXEL_FORMAT_ABGR_8888: ABGR, 32 bits
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* @COGL_PIXEL_FORMAT_RGBA_1010102 : RGBA, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_BGRA_1010102 : BGRA, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_ARGB_2101010 : ARGB, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_ABGR_2101010 : ABGR, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_RGBA_8888_PRE: Premultiplied RGBA, 32 bits
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* @COGL_PIXEL_FORMAT_BGRA_8888_PRE: Premultiplied BGRA, 32 bits
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* @COGL_PIXEL_FORMAT_ARGB_8888_PRE: Premultiplied ARGB, 32 bits
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* @COGL_PIXEL_FORMAT_ABGR_8888_PRE: Premultiplied ABGR, 32 bits
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* @COGL_PIXEL_FORMAT_RGBA_4444_PRE: Premultiplied RGBA, 16 bits
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* @COGL_PIXEL_FORMAT_RGBA_5551_PRE: Premultiplied RGBA, 16 bits
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* @COGL_PIXEL_FORMAT_RGBA_1010102_PRE: Premultiplied RGBA, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_BGRA_1010102_PRE: Premultiplied BGRA, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_ARGB_2101010_PRE: Premultiplied ARGB, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_ABGR_2101010_PRE: Premultiplied ABGR, 32 bits, 10 bpc
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* @COGL_PIXEL_FORMAT_RGBA_FP_16161616: RGBA half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_BGRA_FP_16161616: BGRA half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_ARGB_FP_16161616: ARGB half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_ABGR_FP_16161616: ABGR half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_RGBA_FP_16161616_PRE: Premultiplied RGBA half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_BGRA_FP_16161616_PRE: Premultiplied BGRA half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_ARGB_FP_16161616_PRE: Premultiplied ARGB half floating point, 64 bit
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* @COGL_PIXEL_FORMAT_ABGR_FP_16161616_PRE: Premultiplied ABGR half floating point, 64 bit
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*
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* Pixel formats used by Cogl. For the formats with a byte per
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* component, the order of the components specify the order in
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* increasing memory addresses. So for example
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* %COGL_PIXEL_FORMAT_RGB_888 would have the red component in the
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* lowest address, green in the next address and blue after that
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* regardless of the endianness of the system.
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*
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* For the formats with non byte aligned components the component
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* order specifies the order within a 16-bit or 32-bit number from
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* most significant bit to least significant. So for
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* %COGL_PIXEL_FORMAT_RGB_565, the red component would be in bits
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* 11-15, the green component would be in 6-11 and the blue component
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* would be in 1-5. Therefore the order in memory depends on the
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* endianness of the system.
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*
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* When uploading a texture %COGL_PIXEL_FORMAT_ANY can be used as the
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* internal format. Cogl will try to pick the best format to use
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* internally and convert the texture data if necessary.
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*
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* Since: 0.8
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*/
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typedef enum /*< prefix=COGL_PIXEL_FORMAT >*/
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{
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COGL_PIXEL_FORMAT_ANY = 0,
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COGL_PIXEL_FORMAT_A_8 = 1 | COGL_A_BIT,
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COGL_PIXEL_FORMAT_RGB_565 = 4,
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COGL_PIXEL_FORMAT_RGBA_4444 = 5 | COGL_A_BIT,
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COGL_PIXEL_FORMAT_RGBA_5551 = 6 | COGL_A_BIT,
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COGL_PIXEL_FORMAT_YUV = 7,
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COGL_PIXEL_FORMAT_G_8 = 8,
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COGL_PIXEL_FORMAT_RG_88 = 9,
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COGL_PIXEL_FORMAT_RGB_888 = 2,
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COGL_PIXEL_FORMAT_BGR_888 = (2 | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_RGBA_8888 = (3 | COGL_A_BIT),
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COGL_PIXEL_FORMAT_BGRA_8888 = (3 | COGL_A_BIT | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_ARGB_8888 = (3 | COGL_A_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ABGR_8888 = (3 | COGL_A_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_RGBA_1010102 = (13 | COGL_A_BIT),
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COGL_PIXEL_FORMAT_BGRA_1010102 = (13 | COGL_A_BIT | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_XRGB_2101010 = (13 | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ARGB_2101010 = (13 | COGL_A_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_XBGR_2101010 = (13 | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ABGR_2101010 = (13 | COGL_A_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_RGBA_FP_16161616 = (11 | COGL_A_BIT),
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COGL_PIXEL_FORMAT_BGRA_FP_16161616 = (11 | COGL_A_BIT | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_XRGB_FP_16161616 = (11 | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ARGB_FP_16161616 = (11 | COGL_A_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_XBGR_FP_16161616 = (11 | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ABGR_FP_16161616 = (11 | COGL_A_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_RGBA_8888_PRE = (3 | COGL_A_BIT | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_BGRA_8888_PRE = (3 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_ARGB_8888_PRE = (3 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ABGR_8888_PRE = (3 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_RGBA_4444_PRE = (COGL_PIXEL_FORMAT_RGBA_4444 | COGL_A_BIT | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_RGBA_5551_PRE = (COGL_PIXEL_FORMAT_RGBA_5551 | COGL_A_BIT | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_RGBA_1010102_PRE = (COGL_PIXEL_FORMAT_RGBA_1010102 | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_BGRA_1010102_PRE = (COGL_PIXEL_FORMAT_BGRA_1010102 | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_ARGB_2101010_PRE = (COGL_PIXEL_FORMAT_ARGB_2101010 | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_ABGR_2101010_PRE = (COGL_PIXEL_FORMAT_ABGR_2101010 | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_RGBA_FP_16161616_PRE = (11 | COGL_A_BIT | COGL_PREMULT_BIT),
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COGL_PIXEL_FORMAT_BGRA_FP_16161616_PRE = (11 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT),
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COGL_PIXEL_FORMAT_ARGB_FP_16161616_PRE = (11 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_ABGR_FP_16161616_PRE = (11 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
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COGL_PIXEL_FORMAT_DEPTH_16 = (9 | COGL_DEPTH_BIT),
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COGL_PIXEL_FORMAT_DEPTH_32 = (3 | COGL_DEPTH_BIT),
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COGL_PIXEL_FORMAT_DEPTH_24_STENCIL_8 = (3 | COGL_DEPTH_BIT | COGL_STENCIL_BIT)
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} CoglPixelFormat;
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/**
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* COGL_PIXEL_FORMAT_MAX_PLANES:
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*
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* The maximum number of planes of a pixel format (see also
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* cogl_pixel_format_get_planes()).
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*/
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#define COGL_PIXEL_FORMAT_MAX_PLANES (4)
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/**
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* cogl_pixel_format_get_bytes_per_pixel:
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* @format: The pixel format
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* @plane: The index of the plane (should not be more than the number of planes
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* in the given format).
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*
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* Queries the number of bytes per pixel for a given format in the given plane.
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*
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* Returns: The number of bytes per pixel in the given format's given plane.
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*/
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COGL_EXPORT int
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cogl_pixel_format_get_bytes_per_pixel (CoglPixelFormat format,
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int plane);
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/*
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* _cogl_pixel_format_has_aligned_components:
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* @format: a #CoglPixelFormat
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*
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* Queries whether the ordering of the components for the given
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* @format depend on the endianness of the host CPU or if the
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* components can be accessed using bit shifting and bitmasking by
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* loading a whole pixel into a word.
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*
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* XXX: If we ever consider making something like this public we
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* should really try to think of a better name and come up with
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* much clearer documentation since it really depends on what
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* point of view you consider this from whether a format like
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* COGL_PIXEL_FORMAT_RGBA_8888 is endian dependent. E.g. If you
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* read an RGBA_8888 pixel into a uint32
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* it's endian dependent how you mask out the different channels.
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* But If you already have separate color components and you want
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* to write them to an RGBA_8888 pixel then the bytes can be
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* written sequentially regardless of the endianness.
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*
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* Return value: %TRUE if you need to consider the host CPU
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* endianness when dealing with the given @format
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* else %FALSE.
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*/
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gboolean
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_cogl_pixel_format_is_endian_dependant (CoglPixelFormat format);
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/*
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* COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format):
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* @format: a #CoglPixelFormat
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*
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* Returns TRUE if the pixel format can take a premult bit. This is
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* currently true for all formats that have an alpha channel except
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* COGL_PIXEL_FORMAT_A_8 (because that doesn't have any other
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* components to multiply by the alpha).
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*/
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#define COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format) \
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(((format) & COGL_A_BIT) && (format) != COGL_PIXEL_FORMAT_A_8)
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/**
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* cogl_pixel_format_get_n_planes:
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* @format: The format for which to get the number of planes
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*
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* Returns the number of planes the given CoglPixelFormat specifies.
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*
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* Returns: The no. of planes of @format (at most %COGL_PIXEL_FORMAT_MAX_PLANES)
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*/
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COGL_EXPORT int
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cogl_pixel_format_get_n_planes (CoglPixelFormat format);
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/**
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* cogl_pixel_format_to_string:
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* @format: a #CoglPixelFormat
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*
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* Returns a string representation of @format, useful for debugging purposes.
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*
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* Returns: (transfer none): A string representation of @format.
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*/
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COGL_EXPORT const char *
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cogl_pixel_format_to_string (CoglPixelFormat format);
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G_END_DECLS
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#endif /* __COGL_PIXEL_FORMAT_H__ */
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