summaryrefslogtreecommitdiffstats
path: root/src/display/pixblock-transform.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/display/pixblock-transform.cpp')
-rw-r--r--src/display/pixblock-transform.cpp279
1 files changed, 0 insertions, 279 deletions
diff --git a/src/display/pixblock-transform.cpp b/src/display/pixblock-transform.cpp
deleted file mode 100644
index 5d5b8a9cf..000000000
--- a/src/display/pixblock-transform.cpp
+++ /dev/null
@@ -1,279 +0,0 @@
-#define __NR_PIXBLOCK_SCALER_CPP__
-
-/*
- * Functions for blitting pixblocks using matrix transformation
- *
- * Author:
- * Niko Kiirala <niko@kiirala.com>
- *
- * Copyright (C) 2006,2009 Niko Kiirala
- *
- * Released under GNU GPL, read the file 'COPYING' for more information
- */
-
-#include <glib.h>
-#include <cmath>
-#if defined (SOLARIS) && (SOLARIS == 8)
-#include "round.h"
-using Inkscape::round;
-#endif
-using std::floor;
-
-#include "display/nr-filter-utils.h"
-
-#include "libnr/nr-blit.h"
-#include "libnr/nr-pixblock.h"
-#include <2geom/affine.h>
-
-namespace NR {
-
-struct RGBA {
- double r, g, b, a;
-};
-struct RGBAi {
- int r, g, b, a;
-};
-
-/**
- * Sanity check function for indexing pixblocks.
- * Catches reading and writing outside the pixblock area.
- * When enabled, decreases filter rendering speed massively.
- */
-inline void _check_index(NRPixBlock const * const pb, int const location, int const line)
-{
- if(false) {
- int max_loc = pb->rs * (pb->area.y1 - pb->area.y0);
- if (location < 0 || (location + 4) > max_loc)
- g_warning("Location %d out of bounds (0 ... %d) at line %d", location, max_loc, line);
- }
-}
-
-void transform_nearest(NRPixBlock *to, NRPixBlock *from, Geom::Affine const &trans)
-{
- if (NR_PIXBLOCK_BPP(from) != 4 || NR_PIXBLOCK_BPP(to) != 4) {
- g_warning("A non-32-bpp image passed to transform_nearest: scaling aborted.");
- return;
- }
-
- bool free_from_on_exit = false;
- if (from->mode != to->mode){
- NRPixBlock *o_from = from;
- from = new NRPixBlock;
- nr_pixblock_setup_fast(from, to->mode, o_from->area.x0, o_from->area.y0, o_from->area.x1, o_from->area.y1, false);
- nr_blit_pixblock_pixblock(from, o_from);
- free_from_on_exit = true;
- }
-
- // Precalculate sizes of source and destination pixblocks
- int from_width = from->area.x1 - from->area.x0;
- int from_height = from->area.y1 - from->area.y0;
- int to_width = to->area.x1 - to->area.x0;
- int to_height = to->area.y1 - to->area.y0;
-
- Geom::Affine itrans = trans.inverse();
-
- // Loop through every pixel of destination image, a line at a time
- for (int to_y = 0 ; to_y < to_height ; to_y++) {
- for (int to_x = 0 ; to_x < to_width ; to_x++) {
- RGBAi result = {0,0,0,0};
-
- int from_x = (int)floor(itrans[0] * (to_x + 0.5 + to->area.x0)
- + itrans[2] * (to_y + 0.5 + to->area.y0)
- + itrans[4]);
- from_x -= from->area.x0;
- int from_y = (int)floor(itrans[1] * (to_x + 0.5 + to->area.x0)
- + itrans[3] * (to_y + 0.5 + to->area.y0)
- + itrans[5]);
- from_y -= from->area.y0;
-
- if (from_x >= 0 && from_x < from_width
- && from_y >= 0 && from_y < from_height) {
- _check_index(from, from_y * from->rs + from_x * 4, __LINE__);
- result.r = NR_PIXBLOCK_PX(from)[from_y * from->rs + from_x * 4];
- result.g = NR_PIXBLOCK_PX(from)[from_y * from->rs + from_x * 4 + 1];
- result.b = NR_PIXBLOCK_PX(from)[from_y * from->rs + from_x * 4 + 2];
- result.a = NR_PIXBLOCK_PX(from)[from_y * from->rs + from_x * 4 + 3];
- }
-
- _check_index(to, to_y * to->rs + to_x * 4, __LINE__);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4] = result.r;
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 1] = result.g;
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 2] = result.b;
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 3] = result.a;
- }
- }
- if (free_from_on_exit) {
- nr_pixblock_release(from);
- delete from;
- }
-}
-
-/** Calculates cubically interpolated value of the four given pixel values.
- * The pixel values should be from four adjacent pixels in source image or
- * four adjacent interpolated values. len should be the x- or y-coordinate
- * (depending on interpolation direction) of the center of the target pixel
- * in source image coordinates.
- */
-__attribute__ ((const))
-inline static double sample(double const a, double const b,
- double const c, double const d,
- double const len)
-{
- double lena = 1.5 + (len - round(len));
- double lenb = 0.5 + (len - round(len));
- double lenc = 0.5 - (len - round(len));
- double lend = 1.5 - (len - round(len));
- double const f = -0.5; // corresponds to cubic Hermite spline
- double sum = 0;
- sum += ((((f * lena) - 5.0 * f) * lena + 8.0 * f) * lena - 4 * f) * a;
- sum += (((f + 2.0) * lenb - (f + 3.0)) * lenb * lenb + 1.0) * b;
- sum += (((f + 2.0) * lenc - (f + 3.0)) * lenc * lenc + 1.0) * c;
- sum += ((((f * lend) - 5.0 * f) * lend + 8.0 * f) * lend - 4 * f) * d;
-
- return sum;
-}
-
-void transform_bicubic(NRPixBlock *to, NRPixBlock *from, Geom::Affine const &trans)
-{
- if (NR_PIXBLOCK_BPP(from) != 4 || NR_PIXBLOCK_BPP(to) != 4) {
- g_warning("A non-32-bpp image passed to transform_bicubic: scaling aborted.");
- return;
- }
-
- bool free_from_on_exit = false;
- if (from->mode != to->mode){
- NRPixBlock *o_from = from;
- from = new NRPixBlock;
- nr_pixblock_setup_fast(from, to->mode, o_from->area.x0, o_from->area.y0, o_from->area.x1, o_from->area.y1, false);
- nr_blit_pixblock_pixblock(from, o_from);
- free_from_on_exit = true;
- }
-
- if (from->mode != NR_PIXBLOCK_MODE_R8G8B8A8P) {
- // TODO: Fix this... (The problem is that for interpolation non-premultiplied colors should be premultiplied...)
- g_warning("transform_bicubic does not properly support non-premultiplied images");
- }
-
- // Precalculate sizes of source and destination pixblocks
- int from_width = from->area.x1 - from->area.x0;
- int from_height = from->area.y1 - from->area.y0;
- int to_width = to->area.x1 - to->area.x0;
- int to_height = to->area.y1 - to->area.y0;
-
- Geom::Affine itrans = trans.inverse();
-
- // Loop through every pixel of destination image, a line at a time
- for (int to_y = 0 ; to_y < to_height ; to_y++) {
- for (int to_x = 0 ; to_x < to_width ; to_x++) {
- double from_x = itrans[0] * (to_x + 0.5 + to->area.x0)
- + itrans[2] * (to_y + 0.5 + to->area.y0)
- + itrans[4] - from->area.x0;
- double from_y = itrans[1] * (to_x + 0.5 + to->area.x0)
- + itrans[3] * (to_y + 0.5 + to->area.y0)
- + itrans[5] - from->area.y0;
-
- if (from_x < 0 || from_x >= from_width ||
- from_y < 0 || from_y >= from_height) {
- continue;
- }
-
- RGBA line[4];
-
- int from_line[4];
- for (int i = 0 ; i < 4 ; i++) {
- int fy_line = (int)round(from_y) + i - 2;
- if (fy_line >= 0) {
- if (fy_line < from_height) {
- from_line[i] = fy_line * from->rs;
- } else {
- from_line[i] = (from_height - 1) * from->rs;
- }
- } else {
- from_line[i] = 0;
- }
- }
-
- for (int i = 0 ; i < 4 ; i++) {
- int k = (int)round(from_x) + i - 2;
- if (k < 0) k = 0;
- if (k >= from_width) k = from_width - 1;
- k *= 4;
- _check_index(from, from_line[0] + k, __LINE__);
- _check_index(from, from_line[1] + k, __LINE__);
- _check_index(from, from_line[2] + k, __LINE__);
- _check_index(from, from_line[3] + k, __LINE__);
- line[i].r = sample(NR_PIXBLOCK_PX(from)[from_line[0] + k],
- NR_PIXBLOCK_PX(from)[from_line[1] + k],
- NR_PIXBLOCK_PX(from)[from_line[2] + k],
- NR_PIXBLOCK_PX(from)[from_line[3] + k],
- from_y);
- line[i].g = sample(NR_PIXBLOCK_PX(from)[from_line[0] + k + 1],
- NR_PIXBLOCK_PX(from)[from_line[1] + k + 1],
- NR_PIXBLOCK_PX(from)[from_line[2] + k + 1],
- NR_PIXBLOCK_PX(from)[from_line[3] + k + 1],
- from_y);
- line[i].b = sample(NR_PIXBLOCK_PX(from)[from_line[0] + k + 2],
- NR_PIXBLOCK_PX(from)[from_line[1] + k + 2],
- NR_PIXBLOCK_PX(from)[from_line[2] + k + 2],
- NR_PIXBLOCK_PX(from)[from_line[3] + k + 2],
- from_y);
- line[i].a = sample(NR_PIXBLOCK_PX(from)[from_line[0] + k + 3],
- NR_PIXBLOCK_PX(from)[from_line[1] + k + 3],
- NR_PIXBLOCK_PX(from)[from_line[2] + k + 3],
- NR_PIXBLOCK_PX(from)[from_line[3] + k + 3],
- from_y);
- }
- RGBA result;
- result.r = round(sample(line[0].r, line[1].r, line[2].r, line[3].r,
- from_x));
- result.g = round(sample(line[0].g, line[1].g, line[2].g, line[3].g,
- from_x));
- result.b = round(sample(line[0].b, line[1].b, line[2].b, line[3].b,
- from_x));
- result.a = round(sample(line[0].a, line[1].a, line[2].a, line[3].a,
- from_x));
-
- using Inkscape::Filters::clamp;
- using Inkscape::Filters::clamp_alpha;
- _check_index(to, to_y * to->rs + to_x * 4, __LINE__);
- if (to->mode == NR_PIXBLOCK_MODE_R8G8B8A8P) {
- /* Make sure, none of the RGB channels exceeds 100% intensity
- * in premultiplied output */
- int const alpha = clamp((int)result.a);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4] =
- clamp_alpha((int)result.r, alpha);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 1] =
- clamp_alpha((int)result.g, alpha);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 2] =
- clamp_alpha((int)result.b, alpha);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 3] = alpha;
- } else {
- /* Clamp the output to unsigned char range */
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4]
- = clamp((int)result.r);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 1]
- = clamp((int)result.g);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 2]
- = clamp((int)result.b);
- NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x * 4 + 3]
- = clamp((int)result.a);
- }
- }
- }
- if (free_from_on_exit) {
- nr_pixblock_release(from);
- delete from;
- }
-}
-
-} /* namespace NR */
-/*
- Local Variables:
- mode:c++
- c-file-style:"stroustrup"
- c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
- indent-tabs-mode:nil
- fill-column:99
- End:
-*/
-// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
generated by cgit v1.2.3 (git 2.25.1) at 2026-05-19 07:56:56 +0000