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index e36574d74d38cb31c2d03d64969c66d11e706d3b..fe21dc125ef2de8694300c22bfeb5dab752624a7 100644 (file)
*/
#include "display/nr-filter-blend.h"
+#include "display/nr-filter-pixops.h"
#include "display/nr-filter-primitive.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-types.h"
+#include "display/nr-filter-units.h"
#include "libnr/nr-pixblock.h"
#include "libnr/nr-matrix.h"
#include "libnr/nr-blit.h"
+#include "libnr/nr-pixops.h"
-static inline int clamp(const int val, const int min, const int max) {
- if (val < min) return min;
- if (val > max) return max;
- return val;
-}
-
-template <void(*blend)(unsigned char *cr, unsigned char const *ca, unsigned char const *cb)>
-static void _render(NRPixBlock &out, NRPixBlock &in1, NRPixBlock &in2) {
- unsigned char *in1_data = NR_PIXBLOCK_PX(&in1);
- unsigned char *in2_data = NR_PIXBLOCK_PX(&in2);
- unsigned char *out_data = NR_PIXBLOCK_PX(&out);
- unsigned char zero_rgba[4] = {0, 0, 0, 0};
-
- if (in1.area.y0 < in2.area.y0) {
- // in1 begins before in2 on y-axis
- for (int y = in1.area.y0 ; y < in2.area.y0 ; y++) {
- int out_line = (y - out.area.y0) * out.rs;
- int in_line = (y - in1.area.y0) * in1.rs;
- for (int x = in1.area.x0 ; x < in1.area.x1 ; x++) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- in1_data + in_line + 4 * (x - in1.area.x0),
- zero_rgba);
- }
- }
- } else if (in1.area.y0 > in2.area.y0) {
- // in2 begins before in1 on y-axis
- for (int y = in2.area.y0 ; y < in1.area.y0 ; y++) {
- int out_line = (y - out.area.y0) * out.rs;
- int in_line = (y - in2.area.y0) * in2.rs;
- for (int x = in2.area.x0 ; x < in2.area.x1 ; x++) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- zero_rgba,
- in2_data + in_line + 4 * (x - in2.area.x0));
- }
- }
- }
-
- for (int y = std::max(in1.area.y0, in2.area.y0) ;
- y < std::min(in1.area.y1, in2.area.y1) ; ++y) {
- int out_line = (y - out.area.y0) * out.rs;
- int in1_line = (y - in1.area.y0) * in1.rs;
- int in2_line = (y - in2.area.y0) * in2.rs;
-
- if (in1.area.x0 < in2.area.x0) {
- // in1 begins before in2 on x-axis
- for (int x = in1.area.x0 ; x < in2.area.x0 ; ++x) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- in1_data + in1_line + 4 * (x - in1.area.x0),
- zero_rgba);
- }
- } else if (in1.area.x0 > in2.area.x0) {
- // in2 begins before in1 on x-axis
- for (int x = in2.area.x0 ; x < in1.area.x0 ; ++x) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- zero_rgba,
- in2_data + in2_line + 4 * (x - in2.area.x0));
- }
- }
-
- for (int x = std::max(in1.area.x0, in2.area.x0) ;
- x < std::min(in1.area.x1, in2.area.x1) ; ++x) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- in1_data + in1_line + 4 * (x - in1.area.x0),
- in2_data + in2_line + 4 * (x - in2.area.x0));
- }
-
- if (in1.area.x1 > in2.area.x1) {
- // in1 ends after in2 on x-axis
- for (int x = in2.area.x1 ; x < in1.area.x1 ; ++x) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- in1_data + in1_line + 4 * (x - in1.area.x0),
- zero_rgba);
- }
- } else if (in1.area.x1 < in2.area.x1) {
- // in2 ends after in1 on x-axis
- for (int x = in1.area.x1 ; x < in2.area.x1 ; ++x) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- zero_rgba,
- in2_data + in2_line + 4 * (x - in2.area.x0));
- }
- }
- }
-
- if (in1.area.y1 > in2.area.y1) {
- // in1 ends after in2 on y-axis
- for (int y = in2.area.y1 ; y < in1.area.y1 ; y++) {
- int out_line = (y - out.area.y0) * out.rs;
- int in_line = (y - in1.area.y0) * in1.rs;
- for (int x = in1.area.x0 ; x < in1.area.x1 ; x++) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- in1_data + in_line + 4 * (x - in1.area.x0),
- zero_rgba);
- }
- }
- } else if (in1.area.y1 < in2.area.y1) {
- // in2 ends after in1 on y-axis
- for (int y = in1.area.y1 ; y < in2.area.y1 ; y++) {
- int out_line = (y - out.area.y0) * out.rs;
- int in_line = (y - in2.area.y0) * in2.rs;
- for (int x = in2.area.x0 ; x < in2.area.x1 ; x++) {
- blend(out_data + out_line + 4 * (x - out.area.x0),
- zero_rgba,
- in2_data + in_line + 4 * (x - in2.area.x0));
- }
- }
- }
-}
+namespace NR {
/*
* From http://www.w3.org/TR/SVG11/filters.html#feBlend
* qb = Opacity value at a given pixel for image B
* ca = Color (RGB) at a given pixel for image A - premultiplied
* cb = Color (RGB) at a given pixel for image B - premultiplied
-*/
+ */
+
+/*
+ * These blending equations given in SVG standard are for color values
+ * in the range 0..1. As these values are stored as unsigned char values,
+ * they need some reworking. An unsigned char value can be thought as
+ * 0.8 fixed point representation of color value. This is how I've
+ * ended up with these equations here.
+ */
+
+// Set alpha / opacity. This line is same for all the blending modes,
+// so let's save some copy-pasting.
+#define SET_ALPHA r[3] = NR_NORMALIZE_21((255 * 255) - (255 - a[3]) * (255 - b[3]))
// cr = (1 - qa) * cb + ca
-inline void blend_normal(unsigned char *r, unsigned char const *a, unsigned char const *b) {
- r[0] = (((255 - a[3]) * b[0]) >> 8) + a[0];
- r[1] = (((255 - a[3]) * b[1]) >> 8) + a[1];
- r[2] = (((255 - a[3]) * b[2]) >> 8) + a[2];
- r[3] = 255 - (((255 - a[3]) * (255 - b[3])) >> 8);
+inline void
+blend_normal(unsigned char *r, unsigned char const *a, unsigned char const *b)
+{
+ r[0] = NR_NORMALIZE_21((255 - a[3]) * b[0]) + a[0];
+ r[1] = NR_NORMALIZE_21((255 - a[3]) * b[1]) + a[1];
+ r[2] = NR_NORMALIZE_21((255 - a[3]) * b[2]) + a[2];
+ SET_ALPHA;
}
// cr = (1-qa)*cb + (1-qb)*ca + ca*cb
-inline void blend_multiply(unsigned char *r, unsigned char const *a, unsigned char const *b) {
- r[0] = ((255 - a[3]) * b[0] + (255 - b[3]) * a[0] + a[0] * b[0]) >> 8;
- r[1] = ((255 - a[3]) * b[1] + (255 - b[3]) * a[1] + a[1] * b[1]) >> 8;
- r[2] = ((255 - a[3]) * b[2] + (255 - b[3]) * a[2] + a[2] * b[2]) >> 8;
- r[3] = 255 - (((255 - a[3]) * (255 - b[3])) >> 8);
+inline void
+blend_multiply(unsigned char *r, unsigned char const *a, unsigned char const *b)
+{
+ r[0] = NR_NORMALIZE_21((255 - a[3]) * b[0] + (255 - b[3]) * a[0]
+ + a[0] * b[0]);
+ r[1] = NR_NORMALIZE_21((255 - a[3]) * b[1] + (255 - b[3]) * a[1]
+ + a[1] * b[1]);
+ r[2] = NR_NORMALIZE_21((255 - a[3]) * b[2] + (255 - b[3]) * a[2]
+ + a[2] * b[2]);
+ SET_ALPHA;
}
// cr = cb + ca - ca * cb
-inline void blend_screen(unsigned char *r, unsigned char const *a, unsigned char const *b) {
- r[0] = b[0] + a[0] - ((a[0] * b[0]) >> 8);
- r[1] = b[1] + a[1] - ((a[1] * b[1]) >> 8);
- r[2] = b[2] + a[2] - ((a[2] * b[2]) >> 8);
- r[3] = 255 - (((255 - a[3]) * (255 - b[3])) >> 8);
+inline void
+blend_screen(unsigned char *r, unsigned char const *a, unsigned char const *b)
+{
+ r[0] = NR_NORMALIZE_21(b[0] * 255 + a[0] * 255 - a[0] * b[0]);
+ r[1] = NR_NORMALIZE_21(b[1] * 255 + a[1] * 255 - a[1] * b[1]);
+ r[2] = NR_NORMALIZE_21(b[2] * 255 + a[2] * 255 - a[2] * b[2]);
+ SET_ALPHA;
}
// cr = Min ((1 - qa) * cb + ca, (1 - qb) * ca + cb)
-inline void blend_darken(unsigned char *r, unsigned char const *a, unsigned char const *b) {
- r[0] = std::min((((255 - a[3]) * b[0]) >> 8) + a[0],
- (((255 - b[3]) * a[0]) >> 8) + b[0]);
- r[1] = std::min((((255 - a[3]) * b[1]) >> 8) + a[1],
- (((255 - b[3]) * a[1]) >> 8) + b[1]);
- r[2] = std::min((((255 - a[3]) * b[2]) >> 8) + a[2],
- (((255 - b[3]) * a[2]) >> 8) + b[2]);
- r[3] = 255 - (((255 - a[3]) * (255 - b[3])) >> 8);
+inline void
+blend_darken(unsigned char *r, unsigned char const *a, unsigned char const *b)
+{
+ r[0] = std::min(NR_NORMALIZE_21((255 - a[3]) * b[0]) + a[0],
+ NR_NORMALIZE_21((255 - b[3]) * a[0]) + b[0]);
+ r[1] = std::min(NR_NORMALIZE_21((255 - a[3]) * b[1]) + a[1],
+ NR_NORMALIZE_21((255 - b[3]) * a[1]) + b[1]);
+ r[2] = std::min(NR_NORMALIZE_21((255 - a[3]) * b[2]) + a[2],
+ NR_NORMALIZE_21((255 - b[3]) * a[2]) + b[2]);
+ SET_ALPHA;
}
// cr = Max ((1 - qa) * cb + ca, (1 - qb) * ca + cb)
-inline void blend_lighten(unsigned char *r, unsigned char const *a, unsigned char const *b) {
- r[0] = std::max((((255 - a[3]) * b[0]) >> 8) + a[0],
- (((255 - b[3]) * a[0]) >> 8) + b[0]);
- r[1] = std::max((((255 - a[3]) * b[1]) >> 8) + a[1],
- (((255 - b[3]) * a[1]) >> 8) + b[1]);
- r[2] = std::max((((255 - a[3]) * b[2]) >> 8) + a[2],
- (((255 - b[3]) * a[2]) >> 8) + b[2]);
- r[3] = 255 - (((255 - a[3]) * (255 - b[3])) >> 8);
+inline void
+blend_lighten(unsigned char *r, unsigned char const *a, unsigned char const *b)
+{
+ r[0] = std::max(NR_NORMALIZE_21((255 - a[3]) * b[0]) + a[0],
+ NR_NORMALIZE_21((255 - b[3]) * a[0]) + b[0]);
+ r[1] = std::max(NR_NORMALIZE_21((255 - a[3]) * b[1]) + a[1],
+ NR_NORMALIZE_21((255 - b[3]) * a[1]) + b[1]);
+ r[2] = std::max(NR_NORMALIZE_21((255 - a[3]) * b[2]) + a[2],
+ NR_NORMALIZE_21((255 - b[3]) * a[2]) + b[2]);
+ SET_ALPHA;
}
-namespace NR {
-
FilterBlend::FilterBlend()
: _blend_mode(BLEND_NORMAL),
_input2(NR_FILTER_SLOT_NOT_SET)
FilterBlend::~FilterBlend()
{}
-int FilterBlend::render(FilterSlot &slot, Matrix const &trans) {
+int FilterBlend::render(FilterSlot &slot, FilterUnits const & /*units*/) {
NRPixBlock *in1 = slot.get(_input);
NRPixBlock *in2 = slot.get(_input2);
NRPixBlock *original_in1 = in1;
nr_blit_pixblock_pixblock(in2, original_in2);
}
+ /* pixops_mix is defined in display/nr-filter-pixops.h
+ * It mixes the two input images with the function given as template
+ * and places the result in output image.
+ */
switch (_blend_mode) {
case BLEND_MULTIPLY:
- _render<blend_multiply>(*out, *in1, *in2);
+ pixops_mix<blend_multiply>(*out, *in1, *in2);
break;
case BLEND_SCREEN:
- _render<blend_screen>(*out, *in1, *in2);
+ pixops_mix<blend_screen>(*out, *in1, *in2);
break;
case BLEND_DARKEN:
- _render<blend_darken>(*out, *in1, *in2);
+ pixops_mix<blend_darken>(*out, *in1, *in2);
break;
case BLEND_LIGHTEN:
- _render<blend_lighten>(*out, *in1, *in2);
+ pixops_mix<blend_lighten>(*out, *in1, *in2);
break;
case BLEND_NORMAL:
default:
- _render<blend_normal>(*out, *in1, *in2);
+ pixops_mix<blend_normal>(*out, *in1, *in2);
break;
}