99 lines
4.6 KiB
C
99 lines
4.6 KiB
C
/* android_print.cpp */
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/* printing support for Tux Paint */
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/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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*/
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// Based on JNI and PrintHelper class
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// https://developer.android.com/reference/android/support/v4/print/PrintHelper.html
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// https://developer.android.com/training/printing/photos.html
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#include "../../SDL2/src/core/android/SDL_android.h"
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#include "android_print.h"
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#include "jni.h"
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/* FIXME: Is this check still needed after the change from android/support/v4 to AndroidX
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and being Android 5 the minimum version we support? */
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// Since Print work is based on Java PrintHelper class, which may not be supported on some old versions
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int IsPrinterAvailable(void)
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{
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JNIEnv *mEnv = Android_JNI_GetEnv();
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jclass mPrintHelperClass = (*mEnv)->FindClass(mEnv, "androidx/print/PrintHelper");
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if (mPrintHelperClass == NULL)
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return 0;
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jmethodID mSupportMethod = (*mEnv)->GetStaticMethodID(mEnv, mPrintHelperClass, "systemSupportsPrint",
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"()Z");
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jboolean support = (*mEnv)->CallStaticBooleanMethod(mEnv, mPrintHelperClass, mSupportMethod);
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return support ? 1 : 0;
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}
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// This function is based on
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// (1) convert surface to Java BitMap object
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// (2) call Java PrintHelper to do print job.
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const char *SurfacePrint(SDL_Surface * surface)
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{
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JNIEnv *mEnv = Android_JNI_GetEnv();
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jclass mBitmapClass = (*mEnv)->FindClass(mEnv, "android/graphics/Bitmap");
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jmethodID mCreateMethod = (*mEnv)->GetStaticMethodID(mEnv, mBitmapClass, "createBitmap",
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"([IIILandroid/graphics/Bitmap$Config;)Landroid/graphics/Bitmap;");
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jintArray mSurfaceArray = (*mEnv)->NewIntArray(mEnv, surface->w * surface->h);
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(*mEnv)->SetIntArrayRegion(mEnv, mSurfaceArray, 0, surface->w * surface->h, surface->pixels);
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jclass mConfigClass = (*mEnv)->FindClass(mEnv, "android/graphics/Bitmap$Config");
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jfieldID mConfigField = (*mEnv)->GetStaticFieldID(mEnv, mConfigClass, "ARGB_8888",
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"Landroid/graphics/Bitmap$Config;");
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jobject mConfig = (*mEnv)->GetStaticObjectField(mEnv, mConfigClass, mConfigField);
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jobject mBitMap = (*mEnv)->CallStaticObjectMethod(mEnv, mBitmapClass, mCreateMethod,
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mSurfaceArray, surface->w, surface->h,
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mConfig);
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jobject mContext = (jobject) SDL_AndroidGetActivity();
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jclass mPrintClass = (*mEnv)->FindClass(mEnv, "androidx/print/PrintHelper");
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// sometimes android v4 support library may be not ready
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if (mPrintClass == NULL)
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return "There is no androidX support library.";
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jmethodID mInitMethod = (*mEnv)->GetMethodID(mEnv, mPrintClass, "<init>",
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"(Landroid/content/Context;)V");
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jobject mPrint = (*mEnv)->NewObject(mEnv, mPrintClass, mInitMethod, mContext);
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jmethodID mPrintMethod = (*mEnv)->GetMethodID(mEnv, mPrintClass, "printBitmap",
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"(Ljava/lang/String;Landroid/graphics/Bitmap;)V");
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/* Thanks to n.collins for the explaination on the int signature
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on https://stackoverflow.com/questions/13468041/android-how-to-call-java-method-from-jni-with-int-and-int-parameters --Pere */
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jmethodID msetScaleMode = (*mEnv)->GetMethodID(mEnv, mPrintClass, "setScaleMode", "(I)V");
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jfieldID mScaleModeField = (*mEnv)->GetStaticFieldID(mEnv, mPrintClass, "SCALE_MODE_FIT", "I");
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jint mScaleModeInt = (*mEnv)->GetStaticIntField(mEnv, mPrintClass, mScaleModeField);
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(*mEnv)->CallVoidMethod(mEnv, mPrint, msetScaleMode, mScaleModeInt);
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jstring mString = (*mEnv)->NewStringUTF(mEnv, "TuxPaint");
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(*mEnv)->CallVoidMethod(mEnv, mPrint, mPrintMethod, mString, mBitMap);
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// clean up
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(*mEnv)->DeleteLocalRef(mEnv, mSurfaceArray);
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(*mEnv)->DeleteLocalRef(mEnv, mConfig);
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(*mEnv)->DeleteLocalRef(mEnv, mPrint);
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(*mEnv)->DeleteLocalRef(mEnv, mString);
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return NULL;
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}
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