SharpMuPDF/mupdf/platform/java/jni/text.c

// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

/* Text interface */

JNIEXPORT void JNICALL
FUN(Text_finalize)(JNIEnv *env, jobject self)
{
	fz_context *ctx = get_context(env);
	fz_text *text = from_Text_safe(env, self);
	if (!ctx || !text) return;
	(*env)->SetLongField(env, self, fid_Text_pointer, 0);
	fz_drop_text(ctx, text);
}

JNIEXPORT jlong JNICALL
FUN(Text_newNative)(JNIEnv *env, jobject self)
{
	fz_context *ctx = get_context(env);
	fz_text *text = NULL;

	if (!ctx) return 0;

	fz_try(ctx)
		text = fz_new_text(ctx);
	fz_catch(ctx)
		jni_rethrow(env, ctx);

	return jlong_cast(text);
}

JNIEXPORT jobject JNICALL
FUN(Text_getBounds)(JNIEnv *env, jobject self, jobject jstroke, jobject jctm)
{
	fz_context *ctx = get_context(env);
	fz_text *text = from_Text(env, self);
	fz_stroke_state *stroke = from_StrokeState(env, jstroke);
	fz_matrix ctm = from_Matrix(env, jctm);
	fz_rect rect;

	if (!ctx || !text) return NULL;
	if (!stroke) jni_throw_arg(env, "stroke must not be null");

	fz_try(ctx)
		rect = fz_bound_text(ctx, text, stroke, ctm);
	fz_catch(ctx)
		jni_rethrow(env, ctx);

	return to_Rect_safe(ctx, env, rect);
}

JNIEXPORT void JNICALL
FUN(Text_showGlyph)(JNIEnv *env, jobject self, jobject jfont, jobject jtrm, jint glyph, jint unicode, jboolean wmode)
{
	fz_context *ctx = get_context(env);
	fz_text *text = from_Text(env, self);
	fz_font *font = from_Font(env, jfont);
	fz_matrix trm = from_Matrix(env, jtrm);

	if (!ctx || !text) return;
	if (!font) jni_throw_arg_void(env, "font must not be null");

	fz_try(ctx)
		fz_show_glyph(ctx, text, font, trm, glyph, unicode, wmode, 0, FZ_BIDI_NEUTRAL, FZ_LANG_UNSET);
	fz_catch(ctx)
		jni_rethrow_void(env, ctx);
}

JNIEXPORT void JNICALL
FUN(Text_showString)(JNIEnv *env, jobject self, jobject jfont, jobject jtrm, jstring jstr, jboolean wmode)
{
	fz_context *ctx = get_context(env);
	fz_text *text = from_Text(env, self);
	fz_font *font = from_Font(env, jfont);
	fz_matrix trm = from_Matrix(env, jtrm);
	const char *str = NULL;

	if (!ctx || !text) return;
	if (!jfont) jni_throw_arg_void(env, "font must not be null");
	if (!jstr) jni_throw_arg_void(env, "string must not be null");

	str = (*env)->GetStringUTFChars(env, jstr, NULL);
	if (!str) return;

	fz_try(ctx)
		trm = fz_show_string(ctx, text, font, trm, str, wmode, 0, FZ_BIDI_NEUTRAL, FZ_LANG_UNSET);
	fz_always(ctx)
		(*env)->ReleaseStringUTFChars(env, jstr, str);
	fz_catch(ctx)
		jni_rethrow_void(env, ctx);

	(*env)->SetFloatField(env, jtrm, fid_Matrix_e, trm.e);
	(*env)->SetFloatField(env, jtrm, fid_Matrix_f, trm.f);
}

JNIEXPORT void JNICALL
FUN(Text_walk)(JNIEnv *env, jobject self, jobject walker)
{
	fz_context *ctx = get_context(env);
	fz_text *text = from_Text(env, self);
	fz_text_span *span;
	fz_font *font = NULL;
	jobject jfont = NULL;
	jobject jtrm = NULL;
	int i;

	if (!ctx || !text) return;
	if (!walker) jni_throw_arg_void(env, "walker must not be null");

	if (text->head == NULL)
		return; /* text has no spans to walk */

	for (span = text->head; span; span = span->next)
	{
		if (font != span->font)
		{
			if (jfont)
				(*env)->DeleteLocalRef(env, jfont);
			font = span->font;
			jfont = to_Font_safe(ctx, env, font);
			if (!jfont)
				return;
		}

		for (i = 0; i < span->len; ++i)
		{
			jtrm = (*env)->NewObject(env, cls_Matrix, mid_Matrix_init,
					span->trm.a, span->trm.b, span->trm.c, span->trm.d,
					span->items[i].x, span->items[i].y);
			if (!jtrm) return;

			(*env)->CallVoidMethod(env, walker, mid_TextWalker_showGlyph,
					jfont, jtrm,
					(jint)span->items[i].gid,
					(jint)span->items[i].ucs,
					(jint)span->wmode);
			if ((*env)->ExceptionCheck(env)) return;

			(*env)->DeleteLocalRef(env, jtrm);
		}
	}
}