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authorSascha Haeberling <haeberling@google.com>2012-10-19 22:43:03 (GMT)
committerSascha Haeberling <haeberling@google.com>2012-10-20 00:04:37 (GMT)
commita6f29e1b7ac87c930b6dbbd1f6e73fefa08bd8fa (patch)
tree03884e7c18d6d3dc9e6ac8f89957523d67a321a4 /jni/filters
parentd0fc0f5fd56f2f2aedcf7ea6583f59a405eea103 (diff)
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Adds a tiny planet (stereographic projection) image filter.
Bug: 7293391 Also fixes an issue where the preview value was statically set to 100. This adds a preview parameter value that can be set for this purpose. Change-Id: I68c4ec04e86ab8a29ef7f561e5f21a298003677e
Diffstat (limited to 'jni/filters')
-rw-r--r--jni/filters/filters.h2
-rw-r--r--jni/filters/tinyplanet.cc148
2 files changed, 149 insertions, 1 deletions
diff --git a/jni/filters/filters.h b/jni/filters/filters.h
index d8728f0..d518b63 100644
--- a/jni/filters/filters.h
+++ b/jni/filters/filters.h
@@ -35,7 +35,7 @@ typedef unsigned int Color;
#define LOG(msg...) __android_log_print(ANDROID_LOG_VERBOSE, "NativeFilters", msg)
-#define JNIFUNCF(cls, name, vars...) Java_com_android_gallery3d_filtershow_filters_ ## cls ## _ ## name(JNIEnv* env, jobject this, vars)
+#define JNIFUNCF(cls, name, vars...) Java_com_android_gallery3d_filtershow_filters_ ## cls ## _ ## name(JNIEnv* env, jobject obj, vars)
#define RED i
#define GREEN i+1
diff --git a/jni/filters/tinyplanet.cc b/jni/filters/tinyplanet.cc
new file mode 100644
index 0000000..bc12c32
--- /dev/null
+++ b/jni/filters/tinyplanet.cc
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "filters.h"
+#include <math.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define PI_F 3.141592653589f
+
+class ImageRGBA {
+ public:
+ ImageRGBA(unsigned char* image, int width, int height)
+ : image_(image), width_(width), height_(height) {
+ width_step_ = width * 4;
+ }
+
+ int Width() const {
+ return width_;
+ }
+
+ int Height() const {
+ return height_;
+ }
+
+ // Pixel accessor.
+ unsigned char* operator()(int x, int y) {
+ return image_ + y * width_step_ + x * 4;
+ }
+ const unsigned char* operator()(int x, int y) const {
+ return image_ + y * width_step_ + x * 4;
+ }
+
+ private:
+ unsigned char* image_;
+ int width_;
+ int height_;
+ int width_step_;
+};
+
+// Interpolate a pixel in a 3 channel image.
+inline void InterpolatePixel(const ImageRGBA &image, float x, float y,
+ unsigned char* dest) {
+ // Get pointers and scale factors for the source pixels.
+ float ax = x - floor(x);
+ float ay = y - floor(y);
+ float axn = 1.0f - ax;
+ float ayn = 1.0f - ay;
+ const unsigned char *p = image(x, y);
+ const unsigned char *p2 = image(x, y + 1);
+
+ // Interpolate each image color plane.
+ dest[0] = static_cast<unsigned char>(axn * ayn * p[0] + ax * ayn * p[4] +
+ ax * ay * p2[4] + axn * ay * p2[0] + 0.5f);
+ p++;
+ p2++;
+
+ dest[1] = static_cast<unsigned char>(axn * ayn * p[0] + ax * ayn * p[4] +
+ ax * ay * p2[4] + axn * ay * p2[0] + 0.5f);
+ p++;
+ p2++;
+
+ dest[2] = static_cast<unsigned char>(axn * ayn * p[0] + ax * ayn * p[4] +
+ ax * ay * p2[4] + axn * ay * p2[0] + 0.5f);
+ p++;
+ p2++;
+}
+
+// Wrap circular coordinates around the globe
+inline float wrap(float value, float dimension) {
+ return value - (dimension * floor(value/dimension));
+}
+
+void StereographicProjection(float scale, unsigned char* input_image,
+ int input_width, int input_height,
+ unsigned char* output_image, int output_width,
+ int output_height) {
+ ImageRGBA input(input_image, input_width, input_height);
+ ImageRGBA output(output_image, output_width, output_height);
+
+ const float image_scale = output_width * scale;
+
+ for (int x = 0; x < output_width; x++) {
+ // Center and scale x
+ float xf = (x - output_width / 2.0f) / image_scale;
+
+ for (int y = 0; y < output_height; y++) {
+ // Center and scale y
+ float yf = (y - output_height / 2.0f) / image_scale;
+
+ // Convert to polar
+ float r = hypotf(xf, yf);
+ float theta = atan2(yf, xf);
+
+ // Project onto plane
+ float phi = 2 * atan(1 / r);
+ // (theta stays the same)
+
+ // Map to panorama image
+ float px = (theta / (2 * PI_F)) * input_width;
+ float py = (phi / PI_F) * input_height;
+
+ // Wrap around the globe
+ px = wrap(px, input_width);
+ py = wrap(py, input_height);
+
+ // Write the interpolated pixel
+ InterpolatePixel(input, px, py, output(x, y));
+ }
+ }
+}
+
+
+void JNIFUNCF(ImageFilterTinyPlanet, nativeApplyFilter, jobject bitmap_in, jint width, jint height, jobject bitmap_out, jint output_size, jfloat scale)
+{
+ char* source = 0;
+ char* destination = 0;
+ AndroidBitmap_lockPixels(env, bitmap_in, (void**) &source);
+ AndroidBitmap_lockPixels(env, bitmap_out, (void**) &destination);
+ unsigned char * rgb_in = (unsigned char * )source;
+ unsigned char * rgb_out = (unsigned char * )destination;
+
+ StereographicProjection(scale, rgb_in, width, height, rgb_out, output_size, output_size);
+ AndroidBitmap_unlockPixels(env, bitmap_in);
+ AndroidBitmap_unlockPixels(env, bitmap_out);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+