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Diffstat (limited to 'src/display/pixblock-scaler.cpp')
| -rw-r--r-- | src/display/pixblock-scaler.cpp | 299 |
1 files changed, 0 insertions, 299 deletions
diff --git a/src/display/pixblock-scaler.cpp b/src/display/pixblock-scaler.cpp deleted file mode 100644 index 5af5230d8..000000000 --- a/src/display/pixblock-scaler.cpp +++ /dev/null @@ -1,299 +0,0 @@ -#define __NR_PIXBLOCK_SCALER_CPP__ - -/* - * Functions for blitting pixblocks using scaling - * - * 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-pixblock.h" -#include "libnr/nr-blit.h" -#include <2geom/forward.h> - -namespace NR { - -struct RGBA { - double r, g, b, a; -}; - -/** 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; -} - -/** - * Sanity check function for indexing pixblocks. - * Catches reading and writing outside the pixblock area. - * When enabled, decreases filter rendering speed massively. - */ -inline static 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); - } -} - -static void scale_bicubic_rgba(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 scale_bicubic_rgba: 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; - - // from_step: when advancing one pixel in destination image, - // how much we should advance in source image - double from_stepx = 1.0 / trans[0]; - double from_stepy = 1.0 / trans[3]; - double from_diffx = from_stepx * (-trans[4]); - double from_diffy = from_stepy * (-trans[5]); - from_diffx = (to->area.x0 * from_stepx + from_diffx) - from->area.x0; - from_diffy = (to->area.y0 * from_stepy + from_diffy) - from->area.y0; - - // Loop through every pixel of destination image, a line at a time - for (int to_y = 0 ; to_y < to_height ; to_y++) { - double from_y = (to_y + 0.5) * from_stepy + from_diffy; - // Pre-calculate beginning of the four horizontal lines, from - // which we should read - 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; - } - } - // Loop through this horizontal line in destination image - // For every pixel, calculate the color of pixel with - // bicubic interpolation and set the pixel value in destination image - for (int to_x = 0 ; to_x < to_width ; to_x++) { - double from_x = (to_x + 0.5) * from_stepx + from_diffx; - RGBA line[4]; - 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)); - - _check_index(to, to_y * to->rs + to_x * 4, __LINE__); - - using Inkscape::Filters::clamp; - using Inkscape::Filters::clamp_alpha; - if (to->mode == NR_PIXBLOCK_MODE_R8G8B8A8P) { - /* Clamp the colour channels to range from 0 to result.a to - * make sure, we don't exceed 100% per colour channel with - * images that have premultiplied alpha */ - - 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 { - 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; - } - -} - -void scale_bicubic_alpha(NRPixBlock *to, NRPixBlock *from, - Geom::Affine const &trans) -{ - if (NR_PIXBLOCK_BPP(from) != 1 || NR_PIXBLOCK_BPP(to) != 1) { - g_warning("A non-8-bpp image passed to scale_bicubic_alpha: scaling aborted."); - return; - } - - // 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; - - // from_step: when advancing one pixel in destination image, - // how much we should advance in source image - double from_stepx = 1.0 / trans[0]; - double from_stepy = 1.0 / trans[3]; - double from_diffx = from_stepx * (-trans[4]); - double from_diffy = from_stepy * (-trans[5]); - from_diffx = (to->area.x0 * from_stepx + from_diffx) - from->area.x0; - from_diffy = (to->area.y0 * from_stepy + from_diffy) - from->area.y0; - - // Loop through every pixel of destination image, a line at a time - for (int to_y = 0 ; to_y < to_height ; to_y++) { - double from_y = (to_y + 0.5) * from_stepy - from_diffy; - // Pre-calculate beginning of the four horizontal lines, from - // which we should read - 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; - } - } - // Loop through this horizontal line in destination image - // For every pixel, calculate the color of pixel with - // bicubic interpolation and set the pixel value in destination image - for (int to_x = 0 ; to_x < to_width ; to_x++) { - double from_x = (to_x + 0.5) * from_stepx - from_diffx; - double line[4]; - 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; - _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] = 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); - } - int result; - result = (int)round(sample(line[0], line[1], line[2], line[3], - from_x)); - - _check_index(to, to_y * to->rs + to_x, __LINE__); - - NR_PIXBLOCK_PX(to)[to_y * to->rs + to_x] - = Inkscape::Filters::clamp(result); - } - } -} - -void scale_bicubic(NRPixBlock *to, NRPixBlock *from, Geom::Affine const &trans) -{ - if (NR_PIXBLOCK_BPP(to) == 4 && NR_PIXBLOCK_BPP(from) == 4) { - scale_bicubic_rgba(to, from, trans); - } else if (NR_PIXBLOCK_BPP(to) == 1 && NR_PIXBLOCK_BPP(from) == 1) { - scale_bicubic_alpha(to, from, trans); - } else { - g_warning("NR::scale_bicubic: unsupported bitdepths for scaling: to %d, from %d", NR_PIXBLOCK_BPP(to), NR_PIXBLOCK_BPP(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 : |