03ca3d19c4
update core.proj as some headers have changed location git-svn-id: http://skia.googlecode.com/svn/trunk@43 2bbb7eff-a529-9590-31e7-b0007b416f81
129 lines
5.0 KiB
C++
129 lines
5.0 KiB
C++
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkFontHost_DEFINED
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#define SkFontHost_DEFINED
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#include "SkScalerContext.h"
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#include "SkTypeface.h"
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class SkDescriptor;
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class SkStream;
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class SkWStream;
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/** \class SkFontHost
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This class is ported to each environment. It is responsible for bridging the gap
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between SkTypeface and the resulting platform-specific instance of SkScalerContext.
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*/
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class SkFontHost {
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public:
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/** Return the closest matching typeface given either an existing family
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(specified by a typeface in that family) or by a familyName, and a
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requested style.
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1) If familyFace is null, use famillyName.
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2) If famillyName is null, use familyFace.
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3) If both are null, return the default font that best matches style
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NOTE: this does not return a new typeface, nor does it affect the
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owner count of an existing one, so the caller is free to ignore the
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return result, or just compare it against null.
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*/
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static SkTypeface* FindTypeface(const SkTypeface* familyFace,
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const char famillyName[],
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SkTypeface::Style style);
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/** Return the typeface associated with the uniqueID, or null if that ID
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does not match any faces.
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NOTE: this does not return a new typeface, nor does it affect the
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owner count of an existing one, so the caller is free to ignore the
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return result, or just compare it against null.
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*/
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static SkTypeface* ResolveTypeface(uint32_t uniqueID);
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/** Return a new stream to read the font data, or null if the uniqueID does
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not match an existing typeface. The caller must call CloseStream() when
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it is finished reading the stream.
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*/
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static SkStream* OpenStream(uint32_t uniqueID);
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/** Call this when finished reading from the stream returned by OpenStream.
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The caller should NOT try to delete the stream.
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*/
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static void CloseStream(uint32_t uniqueID, SkStream*);
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/** Return a new typeface given the data buffer (owned by the caller).
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If the data does not represent a valid font, return null. The caller is
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responsible for unref-ing the returned typeface (if it is not null).
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*/
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static SkTypeface* CreateTypeface(SkStream*);
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/** Return a new typeface from the specified file path. If the file does not
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represent a valid font, this returns null. If a typeface is returned,
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the caller is responsible for calling unref() when it is no longer used.
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*/
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static SkTypeface* CreateTypefaceFromFile(const char path[]);
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///////////////////////////////////////////////////////////////////////////
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/** Write a unique identifier to the stream, so that the same typeface can
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be retrieved with Deserialize().
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*/
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static void Serialize(const SkTypeface*, SkWStream*);
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/** Given a stream created by Serialize(), return the corresponding typeface
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or null if no match is found.
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NOTE: this does not return a new typeface, nor does it affect the
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owner count of an existing one, so the caller is free to ignore the
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return result, or just compare it against null.
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*/
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static SkTypeface* Deserialize(SkStream*);
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///////////////////////////////////////////////////////////////////////////
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/** Return a subclass of SkScalarContext
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*/
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static SkScalerContext* CreateScalerContext(const SkDescriptor* desc);
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/** Return a scalercontext using the "fallback" font. If there is no designated
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fallback, return null.
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*/
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static SkScalerContext* CreateFallbackScalerContext(const SkScalerContext::Rec&);
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/** Return the number of bytes (approx) that should be purged from the font
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cache. The input parameter is the cache's estimate of how much as been
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allocated by the cache so far.
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To purge (basically) everything, return the input parameter.
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To purge nothing, return 0
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*/
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static size_t ShouldPurgeFontCache(size_t sizeAllocatedSoFar);
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/** Return SkScalerContext gamma flag, or 0, based on the paint that will be
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used to draw something with antialiasing.
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*/
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static int ComputeGammaFlag(const SkPaint& paint);
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/** Return NULL or a pointer to 256 bytes for the black (table[0]) and
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white (table[1]) gamma tables.
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*/
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static void GetGammaTables(const uint8_t* tables[2]);
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};
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#endif
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