From: Antonio Ospite <ospite@studenti.unina.it>
Date: Sat, 14 Sep 2013 15:13:18 +0000 (+0200)
Subject: Initial import
X-Git-Url: https://git.ao2.it/experiments/leptonica.git/commitdiff_plain/be5711cdcf094c150b2517a2a13955f7db9efdd1

Initial import
---

be5711cdcf094c150b2517a2a13955f7db9efdd1
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a710bf6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,38 @@
+CFLAGS = -ansi -pedantic -pedantic-errors -Wall -g3 -O2 -D_ANSI_SOURCE_
+CFLAGS += -fno-common \
+	  -Wall \
+	  -Wdeclaration-after-statement \
+	  -Wextra \
+	  -Wformat=2 \
+	  -Winit-self \
+	  -Winline \
+	  -Wpacked \
+	  -Wp,-D_FORTIFY_SOURCE=2 \
+	  -Wpointer-arith \
+	  -Wlarger-than-65500 \
+	  -Wmissing-declarations \
+	  -Wmissing-format-attribute \
+	  -Wmissing-noreturn \
+	  -Wmissing-prototypes \
+	  -Wnested-externs \
+	  -Wold-style-definition \
+	  -Wredundant-decls \
+	  -Wsign-compare \
+	  -Wstrict-aliasing=2 \
+	  -Wstrict-prototypes \
+	  -Wswitch-enum \
+	  -Wundef \
+	  -Wunreachable-code \
+	  -Wunsafe-loop-optimizations \
+	  -Wunused-but-set-variable \
+	  -Wwrite-strings
+
+LDLIBS = -llept
+
+leptonica-projective-transform: leptonica-projective-transform.o
+
+clean:
+	rm -rf *~ *.o leptonica-projective-transform transformed_image.jpg
+
+test: leptonica-projective-transform
+	valgrind --leak-check=full --show-reachable=yes ./leptonica-projective-transform road.png
diff --git a/leptonica-projective-transform.c b/leptonica-projective-transform.c
new file mode 100644
index 0000000..6035526
--- /dev/null
+++ b/leptonica-projective-transform.c
@@ -0,0 +1,119 @@
+/* 
+ * leptonica-projective-transform - Example for pixProjectiveSampled()
+ *
+ * Copyright (C) 2013  Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <leptonica/allheaders.h>
+
+#define WIDTH 800
+#define HEIGHT 480
+
+#define X_CORRECTION 200
+
+int main(int argc, char *argv[])
+{
+	int ret;
+	PIX *image;
+	BOX *viewport;
+	PIX *cropped_image;
+	PTA *src;
+	PTA *dst;
+	l_float32 *transform_coeffs;
+	PIX *transformed_image;
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s <image>\n", argv[0]);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	image = pixRead(argv[1]);
+	if (image == NULL) {
+		fprintf(stderr, "Cannot load image\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	src = ptaCreate(4);
+	if (src == NULL) {
+		ret = -ENOMEM;
+		goto out_destroy_image;
+	}
+	ptaAddPt(src, 0, 0);
+	ptaAddPt(src, WIDTH, 0);
+	ptaAddPt(src, WIDTH, HEIGHT);
+	ptaAddPt(src, 0, HEIGHT);
+
+	dst = ptaCreate(4);
+	if (dst == NULL) {
+		ret = -ENOMEM;
+		goto out_destroy_pta_src;
+	}
+	ptaAddPt(dst, X_CORRECTION, 0);
+	ptaAddPt(dst, WIDTH - X_CORRECTION, 0);
+	ptaAddPt(dst, WIDTH, HEIGHT);
+	ptaAddPt(dst, 0, HEIGHT);
+
+	transform_coeffs = NULL;
+	ret = getProjectiveXformCoeffs(dst, src, &transform_coeffs);
+	if (ret != 0) {
+		ret = -ENOMEM;
+		goto out_destroy_pta_dst;
+	}
+
+	/* Transform only a part of the whole image */
+	viewport = boxCreateValid(0, 0, WIDTH, HEIGHT);
+	if (viewport == NULL) {
+		ret = -EINVAL;
+		goto out_free_transform_coeffs;
+	}
+	cropped_image = pixClipRectangle(image, viewport, NULL);
+	if (cropped_image == NULL) {
+		ret = -EINVAL;
+		goto out_destroy_viewport;
+	}
+
+	/* Apply the perspective transformation */
+	transformed_image = pixProjectiveSampled(cropped_image, transform_coeffs, L_BRING_IN_BLACK);
+	if (transformed_image == NULL) {
+		fprintf(stderr, "Cannot create transformed image\n");
+		ret = -EINVAL;
+		goto out_free_cropped_image;
+	}
+
+	pixWrite("transformed_image.jpg", transformed_image, IFF_JFIF_JPEG);
+
+	ret = 0;
+
+	pixDestroy(&transformed_image);
+out_free_cropped_image:
+	pixDestroy(&cropped_image);
+out_destroy_viewport:
+	boxDestroy(&viewport);
+out_free_transform_coeffs:
+	FREE(transform_coeffs);
+out_destroy_pta_dst:
+	ptaDestroy(&dst);
+out_destroy_pta_src:
+	ptaDestroy(&src);
+out_destroy_image:
+	pixDestroy(&image);
+out:
+	return ret;
+}
diff --git a/road.png b/road.png
new file mode 100644
index 0000000..48ae0c9
Binary files /dev/null and b/road.png differ