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311 lines
10 KiB
C
311 lines
10 KiB
C
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Oracle Corporation code.
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*
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* The Initial Developer of the Original Code is Oracle Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <pavlov@pavlov.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_COLOR_H
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#define GFX_COLOR_H
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#ifdef MOZILLA_INTERNAL_API
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#include "nsPrintfCString.h"
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#endif
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#include "gfxTypes.h"
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#include "prbit.h" // for PR_ROTATE_(LEFT,RIGHT)32
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#include "prio.h" // for ntohl
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#define GFX_UINT32_FROM_BPTR(pbptr,i) (((PRUint32*)(pbptr))[i])
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#if defined(IS_BIG_ENDIAN)
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#define GFX_NTOHL(x) (x)
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#define GFX_HAVE_CHEAP_NTOHL
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#elif defined(_WIN32)
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#if (_MSC_VER >= 1300) // also excludes MinGW
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#include <stdlib.h>
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#pragma intrinsic(_byteswap_ulong)
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#define GFX_NTOHL(x) _byteswap_ulong(x)
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#define GFX_HAVE_CHEAP_NTOHL
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#else
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// A reasonably fast generic little-endian implementation.
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#define GFX_NTOHL(x) \
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( (PR_ROTATE_RIGHT32((x),8) & 0xFF00FF00) | \
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(PR_ROTATE_LEFT32((x),8) & 0x00FF00FF) )
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#endif
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#else
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#define GFX_NTOHL(x) ntohl(x)
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#define GFX_HAVE_CHEAP_NTOHL
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#endif
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/**
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* GFX_0XFF_PPIXEL_FROM_BPTR(x)
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*
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* Avoid tortured construction of 32-bit ARGB pixel from 3 individual bytes
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* of memory plus constant 0xFF. RGB bytes are already contiguous!
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* Equivalent to: GFX_PACKED_PIXEL(0xff,r,g,b)
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*
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* Attempt to use fast byte-swapping instruction(s), e.g. bswap on x86, in
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* preference to a sequence of shift/or operations.
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*/
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#if defined(GFX_HAVE_CHEAP_NTOHL)
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#define GFX_0XFF_PPIXEL_FROM_UINT32(x) \
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( (GFX_NTOHL(x) >> 8) | (0xFF << 24) )
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#else
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// A reasonably fast generic little-endian implementation.
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#define GFX_0XFF_PPIXEL_FROM_UINT32(x) \
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( (PR_ROTATE_LEFT32((x),16) | 0xFF00FF00) & ((x) | 0xFFFF00FF) )
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#endif
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#define GFX_0XFF_PPIXEL_FROM_BPTR(x) \
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( GFX_0XFF_PPIXEL_FROM_UINT32(GFX_UINT32_FROM_BPTR((x),0)) )
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/**
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* GFX_BLOCK_RGB_TO_FRGB(from,to)
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* sizeof(*from) == sizeof(char)
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* sizeof(*to) == sizeof(PRUint32)
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*
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* Copy 4 pixels at a time, reading blocks of 12 bytes (RGB x4)
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* and writing blocks of 16 bytes (FRGB x4)
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*/
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#define GFX_BLOCK_RGB_TO_FRGB(from,to) \
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PR_BEGIN_MACRO \
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PRUint32 m0 = GFX_UINT32_FROM_BPTR(from,0), \
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m1 = GFX_UINT32_FROM_BPTR(from,1), \
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m2 = GFX_UINT32_FROM_BPTR(from,2), \
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rgbr = GFX_NTOHL(m0), \
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gbrg = GFX_NTOHL(m1), \
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brgb = GFX_NTOHL(m2), \
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p0, p1, p2, p3; \
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p0 = 0xFF000000 | ((rgbr) >> 8); \
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p1 = 0xFF000000 | ((rgbr) << 16) | ((gbrg) >> 16); \
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p2 = 0xFF000000 | ((gbrg) << 8) | ((brgb) >> 24); \
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p3 = 0xFF000000 | (brgb); \
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to[0] = p0; to[1] = p1; to[2] = p2; to[3] = p3; \
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PR_END_MACRO
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/**
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* Fast approximate division by 255. It has the property that
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* for all 0 <= n <= 255*255, GFX_DIVIDE_BY_255(n) == n/255.
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* But it only uses two adds and two shifts instead of an
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* integer division (which is expensive on many processors).
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*
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* equivalent to ((v)/255)
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*/
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#define GFX_DIVIDE_BY_255(v) \
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(((((unsigned)(v)) << 8) + ((unsigned)(v)) + 255) >> 16)
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/**
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* Fast premultiply macro
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*
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* equivalent to (((c)*(a))/255)
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*/
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#define GFX_PREMULTIPLY(c,a) GFX_DIVIDE_BY_255((c)*(a))
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/**
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* Macro to pack the 4 8-bit channels (A,R,G,B)
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* into a 32-bit packed premultiplied pixel.
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*
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* The checks for 0 alpha or max alpha ensure that the
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* compiler selects the quicked calculation when alpha is constant.
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*/
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#define GFX_PACKED_PIXEL(a,r,g,b) \
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((a) == 0x00) ? 0x00000000 : \
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((a) == 0xFF) ? ((0xFF << 24) | ((r) << 16) | ((g) << 8) | (b)) \
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: ((a) << 24) | \
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(GFX_PREMULTIPLY(r,a) << 16) | \
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(GFX_PREMULTIPLY(g,a) << 8) | \
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(GFX_PREMULTIPLY(b,a))
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/**
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* Macro to pack the 4 8-bit channels (A,R,G,B)
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* into a 32-bit packed NON-premultiplied pixel.
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*/
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#define GFX_PACKED_PIXEL_NO_PREMULTIPLY(a,r,g,b) \
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(((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
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/**
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* A color value, storing red, green, blue and alpha components.
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* This class does not use premultiplied alpha.
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*
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* XXX should this use doubles (instead of gfxFloat), for consistency with
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* cairo?
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*/
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struct THEBES_API gfxRGBA {
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gfxFloat r, g, b, a;
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enum PackedColorType {
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PACKED_ABGR,
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PACKED_ABGR_PREMULTIPLIED,
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PACKED_ARGB,
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PACKED_ARGB_PREMULTIPLIED,
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PACKED_XBGR,
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PACKED_XRGB
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};
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gfxRGBA() { }
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/**
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* Intialize this color using explicit red, green, blue and alpha
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* values.
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*/
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gfxRGBA(gfxFloat _r, gfxFloat _g, gfxFloat _b, gfxFloat _a=1.0) : r(_r), g(_g), b(_b), a(_a) {}
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/**
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* Initialize this color from a packed 32-bit color.
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* The color value is interpreted based on colorType;
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* all values use the native platform endianness.
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*
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* @see gfxRGBA::Packed
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*/
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gfxRGBA(PRUint32 c, PackedColorType colorType = PACKED_ABGR) {
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if (colorType == PACKED_ABGR ||
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colorType == PACKED_XBGR ||
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colorType == PACKED_ABGR_PREMULTIPLIED)
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{
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r = ((c >> 0) & 0xff) * (1.0 / 255.0);
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g = ((c >> 8) & 0xff) * (1.0 / 255.0);
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b = ((c >> 16) & 0xff) * (1.0 / 255.0);
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a = ((c >> 24) & 0xff) * (1.0 / 255.0);
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} else if (colorType == PACKED_ARGB ||
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colorType == PACKED_XRGB ||
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colorType == PACKED_ARGB_PREMULTIPLIED)
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{
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b = ((c >> 0) & 0xff) * (1.0 / 255.0);
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g = ((c >> 8) & 0xff) * (1.0 / 255.0);
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r = ((c >> 16) & 0xff) * (1.0 / 255.0);
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a = ((c >> 24) & 0xff) * (1.0 / 255.0);
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}
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if (colorType == PACKED_ABGR_PREMULTIPLIED ||
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colorType == PACKED_ARGB_PREMULTIPLIED)
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{
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if (a > 0.0) {
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r /= a;
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g /= a;
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b /= a;
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}
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} else if (colorType == PACKED_XBGR ||
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colorType == PACKED_XRGB)
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{
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a = 1.0;
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}
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}
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/**
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* Initialize this color by parsing the given string.
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* XXX implement me!
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*/
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#if 0
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gfxRGBA(const char* str) {
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a = 1.0;
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// if aString[0] is a #, parse it as hex
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// if aString[0] is a letter, parse it as a color name
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// if aString[0] is a number, parse it loosely as hex
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}
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#endif
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bool operator==(const gfxRGBA& other) const
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{
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return r == other.r && g == other.g && b == other.b && a == other.a;
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}
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bool operator!=(const gfxRGBA& other) const
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{
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return !(*this == other);
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}
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/**
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* Returns this color value as a packed 32-bit integer. This reconstructs
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* the int32 based on the given colorType, always in the native byte order.
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*
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* Note: gcc 4.2.3 on at least Ubuntu (x86) does something strange with
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* (PRUint8)(c * 255.0) << x, where the result is different than
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* double d = c * 255.0; v = ((PRUint8) d) << x.
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*/
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PRUint32 Packed(PackedColorType colorType = PACKED_ABGR) const {
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gfxFloat rb = (r * 255.0);
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gfxFloat gb = (g * 255.0);
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gfxFloat bb = (b * 255.0);
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gfxFloat ab = (a * 255.0);
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if (colorType == PACKED_ABGR || colorType == PACKED_XBGR) {
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return (PRUint8(ab) << 24) |
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(PRUint8(bb) << 16) |
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(PRUint8(gb) << 8) |
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(PRUint8(rb) << 0);
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} else if (colorType == PACKED_ARGB || colorType == PACKED_XRGB) {
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return (PRUint8(ab) << 24) |
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(PRUint8(rb) << 16) |
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(PRUint8(gb) << 8) |
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(PRUint8(bb) << 0);
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}
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rb = (r*a) * 255.0;
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gb = (g*a) * 255.0;
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bb = (b*a) * 255.0;
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if (colorType == PACKED_ABGR_PREMULTIPLIED) {
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return (((PRUint8)(ab) << 24) |
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((PRUint8)(bb) << 16) |
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((PRUint8)(gb) << 8) |
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((PRUint8)(rb) << 0));
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} else if (colorType == PACKED_ARGB_PREMULTIPLIED) {
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return (((PRUint8)(ab) << 24) |
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((PRUint8)(rb) << 16) |
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((PRUint8)(gb) << 8) |
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((PRUint8)(bb) << 0));
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}
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return 0;
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}
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#ifdef MOZILLA_INTERNAL_API
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/**
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* Convert this color to a hex value. For example, for rgb(255,0,0),
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* this will return FF0000.
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*/
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// XXX I'd really prefer to just have this return an nsACString
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// Does this function even make sense, since we're just ignoring the alpha value?
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void Hex(nsACString& result) const {
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nsPrintfCString hex(8, "%02x%02x%02x", PRUint8(r*255.0), PRUint8(g*255.0), PRUint8(b*255.0));
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result.Assign(hex);
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}
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#endif
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};
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#endif /* _GFX_COLOR_H */
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