mirror of https://github.com/odrling/Aegisub
Add directional blur
Originally committed to SVN as r1489.
This commit is contained in:
Niels Martin Hansen
parent
8dee40348d
commit
e99d9800c0
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@ -151,6 +151,12 @@ box filters over more general filters and using box blur over gaussian blur
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is probably no faster and might even be slower.
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raster.directional_blur(surface, angle, sigma)
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Apply a variable strength directional gaussian kernel blur to the image.
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Also known as motion blur. The angle is given in radians.
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raster.invert(surface)
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Invert the colour in the given surface.
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@ -2,6 +2,7 @@ function render_frame(f, t)
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local surf = f.create_cairo_surface()
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--raster.gaussian_blur(surf, t)--1+(1-math.cos(t*10))*2)
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--raster.invert(surf)
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raster.separable_filter(surf, {-1, 3, -1}, 1)
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--raster.separable_filter(surf, {-1, 3, -1}, 1)
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raster.directional_blur(surf, t, t/10)
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f.overlay_cairo_surface(surf, 0, 0)
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end
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102
OverLua/image.h
102
OverLua/image.h
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@ -34,6 +34,7 @@
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#include <memory.h>
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#include <stdint.h>
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#include <omp.h>
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#include <math.h>
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// Forward
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@ -49,6 +50,7 @@ namespace PixelFormat {
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void operator = (const T &n) { }
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};
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typedef NopAssigningConstant<uint8_t,255> ROA; // "read only alpha"
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typedef NopAssigningConstant<uint8_t,0> ROC; // "read only colour"
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// 24 bit formats
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struct RGB {
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@ -146,6 +148,17 @@ namespace PixelFormat {
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template <class PixFmt> ABGR(const PixFmt &src) { a = src.A(); r = src.R(); g = src.G(); b = src.B(); }
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};
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// Alpha only
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struct A8 {
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uint8_t a;
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inline ROC R() const { return ROC(); }
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inline ROC G() const { return ROC(); }
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inline ROC B() const { return ROC(); }
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inline uint8_t &A() { return a; } inline uint8_t A() const { return a; }
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A8() : a(0) { }
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template <class PixFmt> A8(const PixFmt &src) { a = src.A(); }
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};
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// cairo types
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// These are only true for little endian architectures
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// If OverLua is ever to run on big endian archs some conditional compiling should be used here
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@ -573,47 +586,70 @@ typedef BaseImageAggregateImpl<PixelFormat::ABGR> ImageABGR;
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// Access pixels with various edge conditions
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namespace EdgeCondition {
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template<class PixFmt>
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inline PixFmt &blackness(BaseImage<PixFmt> &img, int x, int y)
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{
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if (x < 0 || y < 0 || x >= img.width || x >= img.height) {
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return PixFmt(); // all construct with all zeroes
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} else {
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return img.Pixel(x,y);
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}
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}
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template<class PixFmt>
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inline PixFmt &GetPixelEdgeBlackness(BaseImage<PixFmt> &img, int x, int y)
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{
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if (x < 0 || y < 0 || x >= img.width || x >= img.height) {
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return PixFmt(); // all construct with all zeroes
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} else {
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template<class PixFmt>
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inline PixFmt &closest(BaseImage<PixFmt> &img, int x, int y)
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{
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if (x < 0) x = 0;
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if (y < 0) y = 0;
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if (x >= img.width) x = img.width-1;
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if (y >= img.height) y = img.height - 1;
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return img.Pixel(x,y);
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}
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template<class PixFmt>
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inline PixFmt &repeat(BaseImage<PixFmt> &img, int x, int y)
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{
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while (x < 0) x += img.width;
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while (y < 0) y += img.height;
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while (x >= img.width) x -= img.width;
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while (y >= img.height) y -= img.height;
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return img.Pixel(x,y);
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}
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template<class PixFmt>
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inline PixFmt &mirror(BaseImage<PixFmt> &img, int x, int y)
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{
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while (x < 0) x += img.width*2;
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while (y < 0) y += img.height*2;
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while (x >= img.width*2) x -= img.width*2;
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while (y >= img.height*2) y -= img.height*2;
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if (x >= img.width) x = img.width - x;
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if (y >= img.height) y = img.height - y;
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return img.Pixel(x,y);
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}
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}
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template<class PixFmt>
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inline PixFmt &GetPixelEdgeClosest(BaseImage<PixFmt> &img, int x, int y)
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{
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if (x < 0) x = 0;
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if (y < 0) y = 0;
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if (x >= img.width) x = img.width-1;
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if (y >= img.height) y = img.height - 1;
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return img.Pixel(x,y);
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}
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template<class PixFmt>
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inline PixFmt &GetPixelEdgeRepeat(BaseImage<PixFmt> &img, int x, int y)
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// FIXME: this is completely broken, the compiler won't accept it
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// when instantiated with one of the EdgeCondition functions for EdgeCond
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template<class PixFmt, class EdgeCond>
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inline PixFmt GetPixelBilinear(BaseImage<PixFmt> &img, double x, double y)
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{
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while (x < 0) x += img.width;
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while (y < 0) y += img.height;
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while (x >= img.width) x -= img.width;
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while (y >= img.height) y -= img.height;
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return img.Pixel(x,y);
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}
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PixFmt res;
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double xpct = x - floor(x), ypct = y - floor(y);
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template<class PixFmt>
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inline PixFmt &GetPixelEdgeMirror(BaseImage<PixFmt> &img, int x, int y)
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{
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while (x < 0) x += img.width*2;
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while (y < 0) y += img.height*2;
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while (x >= img.width*2) x -= img.width*2;
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while (y >= img.height*2) y -= img.height*2;
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if (x >= img.width) x = img.width - x;
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if (y >= img.height) y = img.height - y;
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return img.Pixel(x,y);
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const PixFmt &src11 = EdgeCond(img, (int)x, (int)y);
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const PixFmt &src12 = EdgeCond(img, (int)x, 1+(int)y);
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const PixFmt &src21 = EdgeCond(img, 1+(int)x, (int)y);
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const PixFmt &src22 = EdgeCond(img, 1+(int)x, 1+(int)y);
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res.R() += (1-xpct) * (1-ypct) * src11.R() + (1-xpct) * ypct * src12.R() + xpct * (1-ypct) * src21.R() + xpct * ypct * src22.R();
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res.G() += (1-xpct) * (1-ypct) * src11.G() + (1-xpct) * ypct * src12.G() + xpct * (1-ypct) * src21.G() + xpct * ypct * src22.G();
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res.B() += (1-xpct) * (1-ypct) * src11.B() + (1-xpct) * ypct * src12.B() + xpct * (1-ypct) * src21.B() + xpct * ypct * src22.B();
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res.A() += (1-xpct) * (1-ypct) * src11.A() + (1-xpct) * ypct * src12.A() + xpct * (1-ypct) * src21.A() + xpct * ypct * src22.A();
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return res;
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}
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@ -256,6 +256,7 @@ void SeparableFilterY(unsigned char *src, unsigned char *dst, int width, int hei
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}
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// Apply a simple separable FIR filter to an image
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void ApplySeparableFilter(lua_State *L, cairo_surface_t *surf, int *kernel, int kernel_size, int divisor)
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{
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// Get surface properties
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@ -297,6 +298,89 @@ void ApplySeparableFilter(lua_State *L, cairo_surface_t *surf, int *kernel, int
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}
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// Apply a general filter an image
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template <class FilterType>
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void ApplyGeneralFilter(lua_State *L, cairo_surface_t *surf, FilterType &filter)
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{
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// Get surface properties
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cairo_surface_flush(surf);
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int width = cairo_image_surface_get_width(surf);
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int height = cairo_image_surface_get_height(surf);
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ptrdiff_t stride = (ptrdiff_t)cairo_image_surface_get_stride(surf);
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cairo_format_t format = cairo_image_surface_get_format(surf);
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unsigned char *data = cairo_image_surface_get_data(surf);
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if (format != CAIRO_FORMAT_ARGB32 && format != CAIRO_FORMAT_RGB24 && format != CAIRO_FORMAT_A8) {
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lua_pushliteral(L, "Unsupported image format for raster operation");
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lua_error(L);
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}
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// Source image copy
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unsigned char *wimg = new unsigned char[height*stride];
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memcpy(wimg, data, height*stride);
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if (format == CAIRO_FORMAT_ARGB32) {
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BaseImage<PixelFormat::cairo_argb32> src(width, height, stride, wimg);
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BaseImage<PixelFormat::cairo_argb32> dst(width, height, stride, data);
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#pragma omp parallel for
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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dst.Pixel(x,y) = filter.argb32(src, x, y);
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}
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}
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} else if (format == CAIRO_FORMAT_RGB24) {
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BaseImage<PixelFormat::cairo_rgb24> src(width, height, stride, wimg);
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BaseImage<PixelFormat::cairo_rgb24> dst(width, height, stride, data);
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#pragma omp parallel for
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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dst.Pixel(x,y) = filter.rgb24(src, x, y);
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}
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}
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} else if (format == CAIRO_FORMAT_A8) {
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BaseImage<PixelFormat::A8> src(width, height, stride, wimg);
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BaseImage<PixelFormat::A8> dst(width, height, stride, data);
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#pragma omp parallel for
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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dst.Pixel(x,y) = filter.a8(src, x, y);
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}
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}
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}
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// Clean up
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cairo_surface_mark_dirty(surf);
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delete[] wimg;
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}
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struct GaussianKernel {
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int *kernel;
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int width;
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int divisor;
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GaussianKernel(double sigma)
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{
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width = (int)(sigma*3 + 0.5) | 1; // binary-or with 1 to make sure the number is odd
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if (width < 3) width = 3;
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kernel = new int[width];
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kernel[width/2] = (int)(NormalDist(sigma, 0) * 255);
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divisor = kernel[width/2];
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for (int x = width/2-1; x >= 0; x--) {
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int val = (int)(NormalDist(sigma, width/2-x) * 255 + 0.5);
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divisor += val*2;
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kernel[x] = val;
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kernel[width - x - 1] = val;
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}
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}
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~GaussianKernel()
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{
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delete[] kernel;
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}
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};
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// raster.gaussian_blur(imgsurf, sigma)
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static int gaussian_blur(lua_State *L)
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{
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@ -305,21 +389,9 @@ static int gaussian_blur(lua_State *L)
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double sigma = luaL_checknumber(L, 2);
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// Generate gaussian kernel
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int kernel_size = (int)(sigma*3 + 0.5) | 1; // binary-or with 1 to make sure the number is odd
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if (kernel_size < 3) kernel_size = 3;
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int *kernel = new int[kernel_size];
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kernel[kernel_size/2] = (int)(NormalDist(sigma, 0) * 255);
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int ksum = kernel[kernel_size/2];
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for (int x = kernel_size/2-1; x >= 0; x--) {
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int val = (int)(NormalDist(sigma, kernel_size/2-x) * 255 + 0.5);
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ksum += val*2;
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kernel[x] = val;
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kernel[kernel_size - x - 1] = val;
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}
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GaussianKernel gk(sigma);
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ApplySeparableFilter(L, surf, kernel, kernel_size, ksum);
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delete[] kernel;
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ApplySeparableFilter(L, surf, gk.kernel, gk.width, gk.divisor);
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return 0;
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}
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@ -342,6 +414,85 @@ static int box_blur(lua_State *L)
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}
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// TODO: figure out how to make this use bilinear pixel grabbing instead
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struct DirectionalBlurFilter {
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GaussianKernel gk;
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double xstep, ystep;
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DirectionalBlurFilter(double angle, double sigma) :
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gk(sigma)
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{
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xstep = cos(angle);
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ystep = -sin(angle);
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}
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inline PixelFormat::A8 a8(BaseImage<PixelFormat::A8> &src, int x, int y)
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{
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int a = 0;
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for (int t = -gk.width/2, i = 0; i < gk.width; t++, i++) {
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//PixelFormat::A8 &srcpx = GetPixelBilinear<PixelFormat::A8, EdgeCondition::repeat>(src, x+xstep*t, y+ystep*t);
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PixelFormat::A8 &srcpx = EdgeCondition::repeat(src, (int)(x+xstep*t), (int)(y+ystep*t));
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a += srcpx.A() * gk.kernel[i];
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}
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PixelFormat::A8 res;
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a = a / gk.divisor; if (a < 0) a = 0; if (a > 255) a = 255;
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res.A() = a;
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return res;
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}
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inline PixelFormat::cairo_rgb24 rgb24(BaseImage<PixelFormat::cairo_rgb24> &src, int x, int y)
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{
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int r = 0, g = 0, b = 0;
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for (int t = -gk.width/2, i = 0; i < gk.width; t++, i++) {
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//PixelFormat::cairo_rgb24 &srcpx = GetPixelBilinear<PixelFormat::cairo_rgb24, EdgeCondition::repeat>(src, x+xstep*t, y+ystep*t);
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PixelFormat::cairo_rgb24 &srcpx = EdgeCondition::repeat(src, (int)(x+xstep*t), (int)(y+ystep*t));
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r += srcpx.R() * gk.kernel[i];
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g += srcpx.G() * gk.kernel[i];
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b += srcpx.B() * gk.kernel[i];
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}
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PixelFormat::cairo_rgb24 res;
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r = r / gk.divisor; if (r < 0) r = 0; if (r > 255) r = 255;
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g = g / gk.divisor; if (g < 0) g = 0; if (g > 255) g = 255;
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b = b / gk.divisor; if (b < 0) b = 0; if (b > 255) b = 255;
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res.R() = r;
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res.G() = g;
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res.B() = b;
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return res;
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}
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inline PixelFormat::cairo_argb32 argb32(BaseImage<PixelFormat::cairo_argb32> &src, int x, int y)
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{
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int a = 0, r = 0, g = 0, b = 0;
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for (int t = -gk.width/2, i = 0; i < gk.width; t++, i++) {
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//PixelFormat::cairo_argb32 &srcpx = GetPixelBilinear<PixelFormat::cairo_argb32, EdgeCondition::repeat>(src, x+xstep*t, y+ystep*t);
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PixelFormat::cairo_argb32 &srcpx = EdgeCondition::repeat(src, (int)(x+xstep*t), (int)(y+ystep*t));
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a += srcpx.A() * gk.kernel[i];
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r += srcpx.R() * gk.kernel[i];
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g += srcpx.G() * gk.kernel[i];
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b += srcpx.B() * gk.kernel[i];
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}
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PixelFormat::cairo_argb32 res;
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a = a / gk.divisor; if (a < 0) a = 0; if (a > 255) a = 255;
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r = r / gk.divisor; if (r < 0) r = 0; if (r > 255) r = 255;
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g = g / gk.divisor; if (g < 0) g = 0; if (g > 255) g = 255;
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b = b / gk.divisor; if (b < 0) b = 0; if (b > 255) b = 255;
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res.A() = a;
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res.R() = r;
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res.G() = g;
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res.B() = b;
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return res;
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}};
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static int directional_blur(lua_State *L)
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{
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cairo_surface_t *surf = CheckSurface(L, 1);
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double angle = luaL_checknumber(L, 2);
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double sigma = luaL_checknumber(L, 3);
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DirectionalBlurFilter filter(angle, sigma);
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ApplyGeneralFilter(L, surf, filter);
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return 0;
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}
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static int invert_image(lua_State *L)
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{
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cairo_surface_t *surf = CheckSurface(L, 1);
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@ -444,7 +595,7 @@ static int separable_filter(lua_State *L)
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// Registration
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static luaL_Reg rasterlib[] = {
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{"gaussian_blur", gaussian_blur}, {"box_blur", box_blur},
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{"gaussian_blur", gaussian_blur}, {"box_blur", box_blur}, {"directional_blur", directional_blur},
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{"separable_filter", separable_filter},
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{"invert", invert_image},
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{NULL, NULL}
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