src/core/SkGraphics.cpp

/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#include "SkGraphics.h"

#include "Sk64.h"
#include "SkBlitter.h"
#include "SkCanvas.h"
#include "SkFloat.h"
#include "SkGeometry.h"
#include "SkMath.h"
#include "SkMatrix.h"
#include "SkPath.h"
#include "SkPathEffect.h"
#include "SkPixelRef.h"
#include "SkRandom.h"
#include "SkRefCnt.h"
#include "SkScalerContext.h"
#include "SkShader.h"
#include "SkStream.h"
#include "SkTSearch.h"
#include "SkTime.h"
#include "SkUtils.h"
#include "SkXfermode.h"

void SkGraphics::GetVersion(int32_t* major, int32_t* minor, int32_t* patch) {
    if (major) {
        *major = SKIA_VERSION_MAJOR;
    }
    if (minor) {
        *minor = SKIA_VERSION_MINOR;
    }
    if (patch) {
        *patch = SKIA_VERSION_PATCH;
    }
}

#define typesizeline(type)  { #type , sizeof(type) }

#ifdef BUILD_EMBOSS_TABLE
    extern void SkEmbossMask_BuildTable();
#endif

#ifdef BUILD_RADIALGRADIENT_TABLE
    extern void SkRadialGradient_BuildTable();
#endif

void SkGraphics::Init() {
#if !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
    SkFlattenable::InitializeFlattenables();
    SkPixelRef::InitializeFlattenables();
#endif
#ifdef BUILD_EMBOSS_TABLE
    SkEmbossMask_BuildTable();
#endif
#ifdef BUILD_RADIALGRADIENT_TABLE
    SkRadialGradient_BuildTable();
#endif

#ifdef SK_DEBUGx
    int i;

    static const struct {
        const char* fTypeName;
        size_t      fSizeOf;
    } gTypeSize[] = {
        typesizeline(char),
        typesizeline(short),
        typesizeline(int),
        typesizeline(long),
        typesizeline(size_t),
        typesizeline(void*),

        typesizeline(S8CPU),
        typesizeline(U8CPU),
        typesizeline(S16CPU),
        typesizeline(U16CPU),

        typesizeline(SkPoint),
        typesizeline(SkRect),
        typesizeline(SkMatrix),
        typesizeline(SkPath),
        typesizeline(SkGlyph),
        typesizeline(SkRefCnt),

        typesizeline(SkPaint),
        typesizeline(SkCanvas),
        typesizeline(SkBlitter),
        typesizeline(SkShader),
        typesizeline(SkXfermode),
        typesizeline(SkPathEffect)
    };

#ifdef SK_CPU_BENDIAN
    SkDebugf("SkGraphics: big-endian\n");
#else
    SkDebugf("SkGraphics: little-endian\n");
#endif

    {
        char    test = 0xFF;
        int     itest = test;   // promote to int, see if it sign-extended
        if (itest < 0)
            SkDebugf("SkGraphics: char is signed\n");
        else
            SkDebugf("SkGraphics: char is unsigned\n");
    }
    for (i = 0; i < (int)SK_ARRAY_COUNT(gTypeSize); i++) {
        SkDebugf("SkGraphics: sizeof(%s) = %d\n",
                 gTypeSize[i].fTypeName, gTypeSize[i].fSizeOf);
    }
    SkDebugf("SkGraphics: font cache limit %dK\n",
             GetFontCacheLimit() >> 10);

#endif
}

///////////////////////////////////////////////////////////////////////////////

#include "SkGlyphCache.h"
#include "SkTypefaceCache.h"

void SkGraphics::Term() {
    PurgeFontCache();
}

#ifndef SK_DEFAULT_FONT_CACHE_LIMIT
    #define SK_DEFAULT_FONT_CACHE_LIMIT (2 * 1024 * 1024)
#endif

#define SK_MIN_FONT_CACHE_LIMIT    (256 * 1024)

static size_t gFontCacheLimit = SK_DEFAULT_FONT_CACHE_LIMIT;

size_t SkGraphics::GetFontCacheLimit() {
    return gFontCacheLimit;
}

size_t SkGraphics::SetFontCacheLimit(size_t bytes) {
    size_t prev = gFontCacheLimit;

    if (bytes < SK_MIN_FONT_CACHE_LIMIT) {
        bytes = SK_MIN_FONT_CACHE_LIMIT;
    }
    gFontCacheLimit = bytes;
    
    // trigger a purge if the new size is smaller that our currently used amount
    if (bytes < SkGlyphCache::GetCacheUsed()) {
        SkGlyphCache::SetCacheUsed(bytes);
    }
    return prev;
}

void SkGraphics::PurgeFontCache() {
    SkGlyphCache::SetCacheUsed(0);
    SkTypefaceCache::PurgeAll();
}

///////////////////////////////////////////////////////////////////////////////

static const char kFontCacheLimitStr[] = "font-cache-limit";
static const size_t kFontCacheLimitLen = sizeof(kFontCacheLimitStr) - 1; 

static const struct {
    const char* fStr;
    size_t fLen;
    size_t (*fFunc)(size_t);
} gFlags[] = {
    {kFontCacheLimitStr, kFontCacheLimitLen, SkGraphics::SetFontCacheLimit}
};

/* flags are of the form param; or param=value; */
void SkGraphics::SetFlags(const char* flags) {
    if (!flags) {
        return;
    }
    const char* nextSemi;
    do {
        size_t len = strlen(flags);
        const char* paramEnd = flags + len;
        const char* nextEqual = strchr(flags, '=');
        if (nextEqual && paramEnd > nextEqual) {
            paramEnd = nextEqual;
        }
        nextSemi = strchr(flags, ';');
        if (nextSemi && paramEnd > nextSemi) {
            paramEnd = nextSemi;
        }
        size_t paramLen = paramEnd - flags;
        for (int i = 0; i < (int)SK_ARRAY_COUNT(gFlags); ++i) {
            if (paramLen != gFlags[i].fLen) {
                continue;
            }
            if (strncmp(flags, gFlags[i].fStr, paramLen) == 0) {
                size_t val = 0;
                if (nextEqual) {
                    val = (size_t) atoi(nextEqual + 1);
                }
                (gFlags[i].fFunc)(val);
                break;
            }
        }
        flags = nextSemi + 1;
    } while (nextSemi);
}