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#include "jni.h"
#include <android_runtime/AndroidRuntime.h>
#include "GraphicsJNI.h"
#include <android_runtime/android_util_AssetManager.h>
#include "SkStream.h"
#include "SkTypeface.h"
#include <utils/AssetManager.h>
using namespace android;
class AutoJavaStringToUTF8 {
public:
AutoJavaStringToUTF8(JNIEnv* env, jstring str) : fEnv(env), fJStr(str)
{
fCStr = env->GetStringUTFChars(str, NULL);
}
~AutoJavaStringToUTF8()
{
fEnv->ReleaseStringUTFChars(fJStr, fCStr);
}
const char* c_str() const { return fCStr; }
private:
JNIEnv* fEnv;
jstring fJStr;
const char* fCStr;
};
static SkTypeface* Typeface_create(JNIEnv* env, jobject, jstring name,
SkTypeface::Style style) {
SkTypeface* face;
if (NULL == name) {
face = SkTypeface::CreateFromName(NULL, (SkTypeface::Style)style);
}
else {
AutoJavaStringToUTF8 str(env, name);
face = SkTypeface::CreateFromName(str.c_str(), style);
}
return face;
}
static SkTypeface* Typeface_createFromTypeface(JNIEnv* env, jobject, SkTypeface* family, int style) {
return SkTypeface::CreateFromTypeface(family, (SkTypeface::Style)style);
}
static void Typeface_unref(JNIEnv* env, jobject obj, SkTypeface* face) {
SkSafeUnref(face);
}
static int Typeface_getStyle(JNIEnv* env, jobject obj, SkTypeface* face) {
return face->style();
}
class AssetStream : public SkStream {
public:
AssetStream(Asset* asset, bool hasMemoryBase) : fAsset(asset)
{
fMemoryBase = hasMemoryBase ? fAsset->getBuffer(false) : NULL;
}
virtual ~AssetStream()
{
delete fAsset;
}
virtual const void* getMemoryBase()
{
return fMemoryBase;
}
virtual bool rewind()
{
off_t pos = fAsset->seek(0, SEEK_SET);
return pos != (off_t)-1;
}
virtual size_t read(void* buffer, size_t size)
{
ssize_t amount;
if (NULL == buffer)
{
if (0 == size) // caller is asking us for our total length
return fAsset->getLength();
// asset->seek returns new total offset
// we want to return amount that was skipped
off_t oldOffset = fAsset->seek(0, SEEK_CUR);
if (-1 == oldOffset)
return 0;
off_t newOffset = fAsset->seek(size, SEEK_CUR);
if (-1 == newOffset)
return 0;
amount = newOffset - oldOffset;
}
else
{
amount = fAsset->read(buffer, size);
}
if (amount < 0)
amount = 0;
return amount;
}
private:
Asset* fAsset;
const void* fMemoryBase;
};
static SkTypeface* Typeface_createFromAsset(JNIEnv* env, jobject,
jobject jassetMgr,
jstring jpath) {
NPE_CHECK_RETURN_ZERO(env, jassetMgr);
NPE_CHECK_RETURN_ZERO(env, jpath);
AssetManager* mgr = assetManagerForJavaObject(env, jassetMgr);
if (NULL == mgr) {
return NULL;
}
AutoJavaStringToUTF8 str(env, jpath);
Asset* asset = mgr->open(str.c_str(), Asset::ACCESS_BUFFER);
if (NULL == asset) {
return NULL;
}
return SkTypeface::CreateFromStream(new AssetStream(asset, true));
}
static SkTypeface* Typeface_createFromFile(JNIEnv* env, jobject, jstring jpath) {
NPE_CHECK_RETURN_ZERO(env, jpath);
AutoJavaStringToUTF8 str(env, jpath);
return SkTypeface::CreateFromFile(str.c_str());
}
#define MIN_GAMMA (0.1f)
#define MAX_GAMMA (10.0f)
static float pinGamma(float gamma) {
if (gamma < MIN_GAMMA) {
gamma = MIN_GAMMA;
} else if (gamma > MAX_GAMMA) {
gamma = MAX_GAMMA;
}
return gamma;
}
extern void skia_set_text_gamma(float, float);
static void Typeface_setGammaForText(JNIEnv* env, jobject, jfloat blackGamma,
jfloat whiteGamma) {
// Comment this out for release builds. This is only used during development
skia_set_text_gamma(pinGamma(blackGamma), pinGamma(whiteGamma));
}
///////////////////////////////////////////////////////////////////////////////
static JNINativeMethod gTypefaceMethods[] = {
{ "nativeCreate", "(Ljava/lang/String;I)I", (void*)Typeface_create },
{ "nativeCreateFromTypeface", "(II)I", (void*)Typeface_createFromTypeface },
{ "nativeUnref", "(I)V", (void*)Typeface_unref },
{ "nativeGetStyle", "(I)I", (void*)Typeface_getStyle },
{ "nativeCreateFromAsset", "(Landroid/content/res/AssetManager;Ljava/lang/String;)I",
(void*)Typeface_createFromAsset },
{ "nativeCreateFromFile", "(Ljava/lang/String;)I",
(void*)Typeface_createFromFile },
{ "setGammaForText", "(FF)V", (void*)Typeface_setGammaForText },
};
int register_android_graphics_Typeface(JNIEnv* env);
int register_android_graphics_Typeface(JNIEnv* env)
{
return android::AndroidRuntime::registerNativeMethods(env,
"android/graphics/Typeface",
gTypefaceMethods,
SK_ARRAY_COUNT(gTypefaceMethods));
}
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