resize framebuffer behind the scenes

src/beauty/beauty-demo.cpp

@@ -212,7 +212,7 @@ int main(int argc, char **argv) {
         });
 
         //BGR
-        cv::UMat rgb, resized, down, faceBgMask, diff, blurred, reduced, sharpened, masked;
+        cv::UMat rgb, down, faceBgMask, diff, blurred, reduced, sharpened, masked;
         cv::UMat frameOut(HEIGHT, WIDTH, CV_8UC3);
         cv::UMat lhalf(HEIGHT * SCALE, WIDTH * SCALE, CV_8UC3);
         cv::UMat rhalf(lhalf.size(), lhalf.type());
@@ -237,7 +237,6 @@ int main(int argc, char **argv) {
 
             cl::compute([&](CLExecContext_t& clclx, cv::UMat& frameBuffer){
                 cvtColor(frameBuffer,rgb,cv::COLOR_BGRA2RGB);
-                cv::resize(rgb, resized, cv::Size(WIDTH, HEIGHT));
                 cv::resize(rgb, down, cv::Size(0, 0), SCALE, SCALE);
                 cvtColor(down, downGrey, cv::COLOR_BGRA2GRAY);
                 detector->detect(down, faces);
@@ -286,8 +285,8 @@ int main(int argc, char **argv) {
                     cv::subtract(faceBgMaskGrey, faceFgMaskGrey, faceBgMaskGrey);
                     cv::bitwise_not(faceBgMaskGrey, faceBgMaskInvGrey);
 
-                    unsharp_mask(resized, sharpened, UNSHARP_STRENGTH);
-                    reduce_shadows(resized, reduced, REDUCE_SHADOW);
+                    unsharp_mask(rgb, sharpened, UNSHARP_STRENGTH);
+                    reduce_shadows(rgb, reduced, REDUCE_SHADOW);
                     blender.prepare(cv::Rect(0, 0, WIDTH, HEIGHT));
                     blender.feed(reduced, faceBgMaskGrey, cv::Point(0, 0));
                     blender.feed(sharpened, faceBgMaskInvGrey, cv::Point(0, 0));
@@ -295,11 +294,11 @@ int main(int argc, char **argv) {
                     frameOutFloat.convertTo(frameOut, CV_8U, 1.0);
 
                     cv::boxFilter(frameOut, blurred, -1, cv::Size(BLUR_KERNEL_SIZE, BLUR_KERNEL_SIZE), cv::Point(-1, -1), true, cv::BORDER_REPLICATE);
-                    cv::subtract(blurred, resized, diff);
+                    cv::subtract(blurred, rgb, diff);
                     bitwise_and(diff, faceBgMask, masked);
                     cv::add(frameOut, masked, reduced);
 
-                    cv::resize(resized, lhalf, cv::Size(0, 0), 0.5, 0.5);
+                    cv::resize(rgb, lhalf, cv::Size(0, 0), 0.5, 0.5);
                     cv::resize(reduced, rhalf, cv::Size(0, 0), 0.5, 0.5);
 
                     frameOut = cv::Scalar::all(0);
@@ -310,7 +309,7 @@ int main(int argc, char **argv) {
             } else {
                 cl::compute([&](CLExecContext_t& clclx, cv::UMat &frameBuffer) {
                     frameOut = cv::Scalar::all(0);
-                    cv::resize(resized, lhalf, cv::Size(0, 0), 0.5, 0.5);
+                    cv::resize(rgb, lhalf, cv::Size(0, 0), 0.5, 0.5);
                     lhalf.copyTo(frameOut(cv::Rect(0, 0, lhalf.size().width, lhalf.size().height)));
                     lhalf.copyTo(frameOut(cv::Rect(lhalf.size().width, 0, lhalf.size().width, lhalf.size().height)));
                     cvtColor(frameOut, frameBuffer, cv::COLOR_BGR2RGBA);

src/common/subsystems.hpp

@@ -297,6 +297,7 @@ bool read(std::function<void(CLExecContext_t&, cv::UMat&)> fn) {
         return false;
     //Color-conversion from RGB to BGRA (OpenCL)
     cv::cvtColor(va::videoFrame, cl::frameBuffer, cv::COLOR_RGB2BGRA);
+    cv::resize(cl::frameBuffer, cl::frameBuffer, cv::Size(app::window_width, app::window_height));
     cl::release_to_gl(cl::frameBuffer);
     return true;
 }

src/nanovg/nanovg-demo.cpp

@@ -186,9 +186,7 @@ int main(int argc, char **argv) {
                 //Color-conversion from HSV to RGB. (OpenCL)
                 cv::cvtColor(hsv, rgb, cv::COLOR_HSV2RGB_FULL);
                 //Color-conversion from RGB to BGRA. (OpenCL)
-                cv::cvtColor(rgb, bgra, cv::COLOR_RGB2BGRA);
-                //Resize the frame if necessary. (OpenCL)
-                cv::resize(bgra, frameBuffer, cv::Size(WIDTH, HEIGHT));
+                cv::cvtColor(rgb, frameBuffer, cv::COLOR_RGB2BGRA);
             });
 
             //Render using nanovg

src/optflow/optflow-demo.cpp

@@ -181,13 +181,13 @@ void composite_layers(const cv::UMat background, const cv::UMat foreground, cons
     cv::add(background, glow, dst);
 }
 
-nanogui::Window* win;
 
 void setup_gui() {
     using namespace kb::gui;
     using namespace kb::display;
 
-    win = form->add_window(nanogui::Vector2i(6, 45), "Settings");
+    static nanogui::Window* win = form->add_window(nanogui::Vector2i(6, 45), "Settings");
+
     auto useOpenCL = make_gui_variable("Use OpenCL", use_opencl, "Enable or disable OpenCL acceleration");
     useOpenCL->set_callback([](bool b){
         cv::ocl::setUseOpenCL(b);
@@ -264,7 +264,7 @@ int main(int argc, char **argv) {
         //BGRA
         cv::UMat background, foreground(frameBufferSize, CV_8UC4, cv::Scalar::all(0));
         //RGB
-        cv::UMat rgb, resized, down;
+        cv::UMat rgb, down;
         //GREY
         cv::UMat backgroundGrey, downPrevGrey, downNextGrey, downMotionMaskGrey;
         vector<cv::Point2f> detectedPoints;
@@ -279,10 +279,8 @@ int main(int argc, char **argv) {
                 break;
 
             cl::compute([&](CLExecContext_t& clctx, cv::UMat& frameBuffer){
-                cvtColor(frameBuffer,rgb,cv::COLOR_BGRA2RGB);
-                cv::resize(rgb, resized, frameBufferSize);
-                cv::resize(rgb, down, cv::Size(WIDTH * fg_scale, HEIGHT * fg_scale));
-                cv::cvtColor(resized, background, cv::COLOR_RGB2BGRA);
+                cv::resize(frameBuffer, down, cv::Size(WIDTH * fg_scale, HEIGHT * fg_scale));
+                cv::cvtColor(frameBuffer, background, cv::COLOR_RGB2BGRA);
                 cv::cvtColor(down, downNextGrey, cv::COLOR_RGB2GRAY);
                 //Subtract the background to create a motion mask
                 prepare_motion_mask(downNextGrey, downMotionMaskGrey);

src/pedestrian/pedestrian-demo.cpp

@@ -163,9 +163,8 @@ int main(int argc, char **argv) {
                 break;
 
             cl::compute([&](CLExecContext_t& clclx, cv::UMat& frameBuffer){
-                cvtColor(frameBuffer,rgb,cv::COLOR_BGRA2RGB);
-                cv::resize(rgb, videoFrameUp, cv::Size(WIDTH, HEIGHT));
-                cv::resize(rgb, videoFrameDown, cv::Size(DOWNSIZE_WIDTH, DOWNSIZE_HEIGHT));
+                cvtColor(frameBuffer,videoFrameUp,cv::COLOR_BGRA2RGB);
+                cv::resize(frameBuffer, videoFrameDown, cv::Size(DOWNSIZE_WIDTH, DOWNSIZE_HEIGHT));
                 cv::cvtColor(videoFrameDown, videoFrameDownGrey, cv::COLOR_RGB2GRAY);
                 cv::cvtColor(videoFrameUp, background, cv::COLOR_RGB2BGRA);
                 hog.detectMultiScale(videoFrameDownGrey, locations, 0, cv::Size(), cv::Size(), 1.025, 2.0, false);

src/tetra/tetra-demo.cpp

@@ -2,8 +2,8 @@
 
 #include "../common/subsystems.hpp"
 
-constexpr long unsigned int WIDTH = 1920;
-constexpr long unsigned int HEIGHT = 1080;
+constexpr long unsigned int WIDTH = 3840;
+constexpr long unsigned int HEIGHT = 2160;
 constexpr double FPS = 60;
 constexpr bool OFFSCREEN = false;
 constexpr const char* OUTPUT_FILENAME = "tetra-demo.mkv";

src/video/video-demo.cpp

@@ -6,7 +6,7 @@
 constexpr long unsigned int WIDTH = 1920;
 constexpr long unsigned int HEIGHT = 1080;
 constexpr const int VA_HW_DEVICE_INDEX = 0;
-constexpr bool OFFSCREEN = true;
+constexpr bool OFFSCREEN = false;
 constexpr const char* OUTPUT_FILENAME = "video-demo.mkv";
 constexpr unsigned long DIAG = hypot(double(WIDTH), double(HEIGHT));
 
@@ -129,11 +129,6 @@ int main(int argc, char **argv) {
             if(!success)
                 break;
 
-            cl::compute([](CLExecContext_t& clctx, cv::UMat& frameBuffer){
-                //Resize the frame if necessary. (OpenCL)
-                cv::resize(frameBuffer, frameBuffer, cv::Size(WIDTH, HEIGHT));
-            });
-
             gl::render([](int w, int h) {
                 //Render using OpenGL
                 render_scene(w, h);