diff options
| -rw-r--r-- | Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp | 38 | ||||
| -rw-r--r-- | Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.h | 2 |
2 files changed, 24 insertions, 16 deletions
diff --git a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp index 57c632521e..7cbec6ea7c 100644 --- a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp +++ b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.cpp @@ -28,9 +28,14 @@ FastBoxBlurFilter::FastBoxBlurFilter(Bitmap& bitmap) { } -// Based on the super fast blur algorithm by Quasimondo, explored here: https://stackoverflow.com/questions/21418892/understanding-super-fast-blur-algorithm void FastBoxBlurFilter::apply_single_pass(size_t radius) { + apply_single_pass(radius, radius); +} + +// Based on the super fast blur algorithm by Quasimondo, explored here: https://stackoverflow.com/questions/21418892/understanding-super-fast-blur-algorithm +void FastBoxBlurFilter::apply_single_pass(size_t radius_x, size_t radius_y) +{ auto format = m_bitmap.format(); VERIFY(format == BitmapFormat::BGRA8888 || format == BitmapFormat::BGRx8888); @@ -52,7 +57,8 @@ void FastBoxBlurFilter::apply_single_pass(size_t radius) int height = m_bitmap.height(); int width = m_bitmap.width(); - int div = 2 * radius + 1; + int div_x = 2 * radius_x + 1; + int div_y = 2 * radius_y + 1; Vector<u8, 1024> intermediate_red; Vector<u8, 1024> intermediate_green; @@ -72,7 +78,7 @@ void FastBoxBlurFilter::apply_single_pass(size_t radius) size_t sum_alpha = 0; // Setup sliding window - for (int i = -(int)radius; i <= (int)radius; ++i) { + for (int i = -(int)radius_x; i <= (int)radius_x; ++i) { auto color_at_px = get_pixel_function(clamp(i, 0, width - 1), y); sum_red += red_value(color_at_px); sum_green += green_value(color_at_px); @@ -81,13 +87,13 @@ void FastBoxBlurFilter::apply_single_pass(size_t radius) } // Slide horizontally for (int x = 0; x < width; ++x) { - intermediate_red[y * width + x] = (sum_red / div); - intermediate_green[y * width + x] = (sum_green / div); - intermediate_blue[y * width + x] = (sum_blue / div); - intermediate_alpha[y * width + x] = (sum_alpha / div); + intermediate_red[y * width + x] = (sum_red / div_x); + intermediate_green[y * width + x] = (sum_green / div_x); + intermediate_blue[y * width + x] = (sum_blue / div_x); + intermediate_alpha[y * width + x] = (sum_alpha / div_x); - auto leftmost_x_coord = max(x - (int)radius, 0); - auto rightmost_x_coord = min(x + (int)radius + 1, width - 1); + auto leftmost_x_coord = max(x - (int)radius_x, 0); + auto rightmost_x_coord = min(x + (int)radius_x + 1, width - 1); auto leftmost_x_color = get_pixel_function(leftmost_x_coord, y); auto rightmost_x_color = get_pixel_function(rightmost_x_coord, y); @@ -111,7 +117,7 @@ void FastBoxBlurFilter::apply_single_pass(size_t radius) size_t sum_alpha = 0; // Setup sliding window - for (int i = -(int)radius; i <= (int)radius; ++i) { + for (int i = -(int)radius_y; i <= (int)radius_y; ++i) { int offset = clamp(i, 0, height - 1) * width + x; sum_red += intermediate_red[offset]; sum_green += intermediate_green[offset]; @@ -121,15 +127,15 @@ void FastBoxBlurFilter::apply_single_pass(size_t radius) for (int y = 0; y < height; ++y) { auto color = Color( - sum_red / div, - sum_green / div, - sum_blue / div, - sum_alpha / div); + sum_red / div_y, + sum_green / div_y, + sum_blue / div_y, + sum_alpha / div_y); set_pixel_function(x, y, color); - auto topmost_y_coord = max(y - (int)radius, 0); - auto bottommost_y_coord = min(y + (int)radius + 1, height - 1); + auto topmost_y_coord = max(y - (int)radius_y, 0); + auto bottommost_y_coord = min(y + (int)radius_y + 1, height - 1); sum_red += intermediate_red[x + bottommost_y_coord * width]; sum_red -= intermediate_red[x + topmost_y_coord * width]; diff --git a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.h b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.h index 57a6fd9c78..3536776298 100644 --- a/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.h +++ b/Userland/Libraries/LibGfx/Filters/FastBoxBlurFilter.h @@ -15,6 +15,8 @@ public: FastBoxBlurFilter(Bitmap&); void apply_single_pass(size_t radius); + void apply_single_pass(size_t radius_x, size_t radius_y); + void apply_three_passes(size_t radius); private: |