matplotlib/src/_image.cpp at master · psinger/matplotlib · GitHub

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/* -*- mode: c++; c-basic-offset: 4 -*- */

#define NO_IMPORT_ARRAY

#include <vector>

#include "agg_color_rgba.h"

#include "agg_conv_transform.h"

#include "agg_image_accessors.h"

#include "agg_path_storage.h"

#include "agg_pixfmt_rgb.h"

#include "agg_pixfmt_rgba.h"

#include "agg_rasterizer_scanline_aa.h"

#include "agg_rasterizer_sl_clip.h"

#include "agg_renderer_scanline.h"

#include "agg_rendering_buffer.h"

#include "agg_scanline_bin.h"

#include "agg_scanline_u.h"

#include "agg_span_allocator.h"

#include "agg_span_image_filter_rgb.h"

#include "agg_span_image_filter_rgba.h"

#include "agg_span_interpolator_linear.h"

#include "util/agg_color_conv_rgb8.h"

#include "_image.h"

#include "mplutils.h"

#include "agg_workaround.h"

typedef fixed_blender_rgba_plain<agg::rgba8, agg::order_rgba> fixed_blender_rgba32_plain;

typedef agg::pixfmt_alpha_blend_rgba<fixed_blender_rgba32_plain, agg::rendering_buffer> pixfmt;

typedef fixed_blender_rgba_pre<agg::rgba8, agg::order_rgba> fixed_blender_rgba32_pre;

typedef agg::pixfmt_alpha_blend_rgba<fixed_blender_rgba32_pre, agg::rendering_buffer> pixfmt_pre;

typedef agg::renderer_base<pixfmt> renderer_base;

typedef agg::span_interpolator_linear<> interpolator_type;

typedef agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip_dbl> rasterizer;

Image::Image()

: bufferIn(NULL),

rbufIn(NULL),

colsIn(0),

rowsIn(0),

bufferOut(NULL),

rbufOut(NULL),

colsOut(0),

rowsOut(0),

BPP(4),

interpolation(BILINEAR),

aspect(ASPECT_FREE),

bg(1, 1, 1, 0),

resample(true)

{

}

Image::Image(unsigned numrows, unsigned numcols, bool isoutput)

: bufferIn(NULL),

rbufIn(NULL),

colsIn(0),

rowsIn(0),

bufferOut(NULL),

rbufOut(NULL),

colsOut(0),

rowsOut(0),

BPP(4),

interpolation(BILINEAR),

aspect(ASPECT_FREE),

bg(1, 1, 1, 0),

resample(true)

{

if (isoutput) {

rowsOut = numrows;

colsOut = numcols;

unsigned NUMBYTES(numrows * numcols * BPP);

bufferOut = new agg::int8u[NUMBYTES];

rbufOut = new agg::rendering_buffer;

rbufOut->attach(bufferOut, colsOut, rowsOut, colsOut * BPP);

} else {

rowsIn = numrows;

colsIn = numcols;

unsigned NUMBYTES(numrows * numcols * BPP);

bufferIn = new agg::int8u[NUMBYTES];

rbufIn = new agg::rendering_buffer;

rbufIn->attach(bufferIn, colsIn, rowsIn, colsIn * BPP);

}

Image::~Image()

{

delete[] bufferIn;

bufferIn = NULL;

delete rbufIn;

rbufIn = NULL;

delete rbufOut;

rbufOut = NULL;

delete[] bufferOut;

bufferOut = NULL;

}

void Image::apply_rotation(double r)

{

agg::trans_affine M = agg::trans_affine_rotation(r * agg::pi / 180.0);

srcMatrix *= M;

imageMatrix *= M;

}

void Image::set_bg(double r, double g, double b, double a)

{

bg.r = r;

bg.g = g;

bg.b = b;

bg.a = a;

}

void Image::apply_scaling(double sx, double sy)

{

agg::trans_affine M = agg::trans_affine_scaling(sx, sy);

srcMatrix *= M;

imageMatrix *= M;

}

void Image::apply_translation(double tx, double ty)

{

agg::trans_affine M = agg::trans_affine_translation(tx, ty);

srcMatrix *= M;

imageMatrix *= M;

}

void Image::as_rgba_str(agg::int8u *outbuf)

{

agg::rendering_buffer rb;

rb.attach(outbuf, colsOut, rowsOut, colsOut * 4);

rb.copy_from(*rbufOut);

}

void Image::color_conv(int format, agg::int8u *outbuf)

{

int row_len = colsOut * 4;

agg::rendering_buffer rtmp;

rtmp.attach(outbuf, colsOut, rowsOut, row_len);

switch (format) {

case 0:

agg::color_conv(&rtmp, rbufOut, agg::color_conv_rgba32_to_bgra32());

break;

case 1:

agg::color_conv(&rtmp, rbufOut, agg::color_conv_rgba32_to_argb32());

break;

default:

throw "Image::color_conv unknown format";

}

void Image::reset_matrix(void)

{

srcMatrix.reset();

imageMatrix.reset();

}

void Image::resize(int numcols, int numrows, int norm, double radius)

{

if (bufferIn == NULL) {

throw "You must first load the image";

}

if (numcols <= 0 || numrows <= 0) {

throw "Width and height must have positive values";

}

colsOut = numcols;

rowsOut = numrows;

size_t NUMBYTES(numrows * numcols * BPP);

delete[] bufferOut;

bufferOut = new agg::int8u[NUMBYTES];

if (bufferOut == NULL) // todo: also handle allocation throw

{

throw "Image::resize could not allocate memory";

}

delete rbufOut;

rbufOut = new agg::rendering_buffer;

rbufOut->attach(bufferOut, numcols, numrows, numcols * BPP);

// init the output rendering/rasterizing stuff

pixfmt pixf(*rbufOut);

renderer_base rb(pixf);

rb.clear(bg);

rasterizer ras;

agg::scanline_u8 sl;

ras.clip_box(0, 0, numcols, numrows);

imageMatrix.invert();

interpolator_type interpolator(imageMatrix);

typedef agg::span_allocator<agg::rgba8> span_alloc_type;

span_alloc_type sa;

// the image path

agg::path_storage path;

agg::rendering_buffer rbufPad;

double x0, y0, x1, y1;

x0 = 0.0;

x1 = colsIn;

y0 = 0.0;

y1 = rowsIn;

path.move_to(x0, y0);

path.line_to(x1, y0);

path.line_to(x1, y1);

path.line_to(x0, y1);

path.close_polygon();

agg::conv_transform<agg::path_storage> imageBox(path, srcMatrix);

ras.add_path(imageBox);

typedef agg::wrap_mode_reflect reflect_type;

typedef agg::image_accessor_wrap<pixfmt_pre, reflect_type, reflect_type> img_accessor_type;

pixfmt_pre pixfmtin(*rbufIn);

img_accessor_type ia(pixfmtin);

switch (interpolation) {

case NEAREST: {

typedef agg::span_image_filter_rgba_nn<img_accessor_type, interpolator_type> span_gen_type;

typedef agg::renderer_scanline_aa<renderer_base, span_alloc_type, span_gen_type>

renderer_type;

span_gen_type sg(ia, interpolator);

renderer_type ri(rb, sa, sg);

agg::render_scanlines(ras, sl, ri);

} break;

case HANNING:

case HAMMING:

case HERMITE: {

agg::image_filter_lut filter;

switch (interpolation) {

case HANNING:

filter.calculate(agg::image_filter_hanning(), norm);

break;

case HAMMING:

filter.calculate(agg::image_filter_hamming(), norm);

break;

case HERMITE:

filter.calculate(agg::image_filter_hermite(), norm);

break;

}

if (resample) {

typedef agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;

typedef agg::renderer_scanline_aa<renderer_base, span_alloc_type, span_gen_type>

renderer_type;

span_gen_type sg(ia, interpolator, filter);

renderer_type ri(rb, sa, sg);

agg::render_scanlines(ras, sl, ri);

} else {

typedef agg::span_image_filter_rgba_2x2<img_accessor_type, interpolator_type>

span_gen_type;

typedef agg::renderer_scanline_aa<renderer_base, span_alloc_type, span_gen_type>

renderer_type;

span_gen_type sg(ia, interpolator, filter);

renderer_type ri(rb, sa, sg);

agg::render_scanlines(ras, sl, ri);

}

} break;

case BILINEAR:

case BICUBIC:

case SPLINE16:

case SPLINE36:

case KAISER:

case QUADRIC:

case CATROM:

case GAUSSIAN:

case BESSEL:

case MITCHELL:

case SINC:

case LANCZOS:

case BLACKMAN: {

agg::image_filter_lut filter;

switch (interpolation) {

case BILINEAR:

filter.calculate(agg::image_filter_bilinear(), norm);

break;

case BICUBIC:

filter.calculate(agg::image_filter_bicubic(), norm);

break;

case SPLINE16:

filter.calculate(agg::image_filter_spline16(), norm);

break;

case SPLINE36:

filter.calculate(agg::image_filter_spline36(), norm);

break;

case KAISER:

filter.calculate(agg::image_filter_kaiser(), norm);

break;

case QUADRIC:

filter.calculate(agg::image_filter_quadric(), norm);

break;

case CATROM:

filter.calculate(agg::image_filter_catrom(), norm);

break;

case GAUSSIAN:

filter.calculate(agg::image_filter_gaussian(), norm);

break;

case BESSEL:

filter.calculate(agg::image_filter_bessel(), norm);

break;

case MITCHELL:

filter.calculate(agg::image_filter_mitchell(), norm);

break;

case SINC:

filter.calculate(agg::image_filter_sinc(radius), norm);

break;

case LANCZOS:

filter.calculate(agg::image_filter_lanczos(radius), norm);

break;

case BLACKMAN:

filter.calculate(agg::image_filter_blackman(radius), norm);

break;

}

if (resample) {

typedef agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;

typedef agg::renderer_scanline_aa<renderer_base, span_alloc_type, span_gen_type>

renderer_type;

span_gen_type sg(ia, interpolator, filter);

renderer_type ri(rb, sa, sg);

agg::render_scanlines(ras, sl, ri);

} else {

typedef agg::span_image_filter_rgba<img_accessor_type, interpolator_type> span_gen_type;

typedef agg::renderer_scanline_aa<renderer_base, span_alloc_type, span_gen_type>

renderer_type;

span_gen_type sg(ia, interpolator, filter);

renderer_type ri(rb, sa, sg);

agg::render_scanlines(ras, sl, ri);

}

} break;

}

void Image::clear()

{

pixfmt pixf(*rbufOut);

renderer_base rb(pixf);

rb.clear(bg);

}

void Image::blend_image(Image &im, unsigned ox, unsigned oy, bool apply_alpha, float alpha)

{

unsigned thisx = 0, thisy = 0;

pixfmt pixf(*rbufOut);

renderer_base rb(pixf);

bool isflip = (im.rbufOut->stride()) < 0;

size_t ind = 0;

for (unsigned j = 0; j < im.rowsOut; j++) {

if (isflip) {

thisy = im.rowsOut - j + oy;

} else {

thisy = j + oy;

}

for (unsigned i = 0; i < im.colsOut; i++) {

thisx = i + ox;

if (thisx >= colsOut || thisy >= rowsOut) {

ind += 4;

continue;

}

pixfmt::color_type p;

p.r = *(im.bufferOut + ind++);

p.g = *(im.bufferOut + ind++);

p.b = *(im.bufferOut + ind++);

if (apply_alpha) {

p.a = (pixfmt::value_type) * (im.bufferOut + ind++) * alpha;

} else {

p.a = *(im.bufferOut + ind++);

}

pixf.blend_pixel(thisx, thisy, p, 255);

}

// utilities for irregular grids

void _bin_indices_middle(

unsigned int *irows, int nrows, const float *ys1, unsigned long ny, float dy, float y_min)

{

int i, j, j_last;

unsigned int *rowstart = irows;

const float *ys2 = ys1 + 1;

const float *yl = ys1 + ny;

float yo = y_min + dy / 2.0;

float ym = 0.5f * (*ys1 + *ys2);

// y/rows

j = 0;

j_last = j;

for (i = 0; i < nrows; i++, yo += dy, rowstart++) {

while (ys2 != yl && yo > ym) {

ys1 = ys2;

ys2 = ys1 + 1;

ym = 0.5f * (*ys1 + *ys2);

j++;

}

*rowstart = j - j_last;

j_last = j;

}

void _bin_indices_middle_linear(float *arows,

unsigned int *irows,

int nrows,

const float *y,

unsigned long ny,

float dy,

float y_min)

{

int i;

int ii = 0;

int iilast = (int)ny - 1;

float sc = 1 / dy;

int iy0 = (int)floor(sc * (y[ii] - y_min));

int iy1 = (int)floor(sc * (y[ii + 1] - y_min));

float invgap = 1.0f / (iy1 - iy0);

for (i = 0; i < nrows && i <= iy0; i++) {

irows[i] = 0;

arows[i] = 1.0;

}

for (; i < nrows; i++) {

while (i > iy1 && ii < iilast) {

ii++;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii + 1] - y_min));

invgap = 1.0f / (iy1 - iy0);

}

if (i >= iy0 && i <= iy1) {

irows[i] = ii;

arows[i] = (iy1 - i) * invgap;

} else

break;

}

for (; i < nrows; i++) {

irows[i] = iilast - 1;

arows[i] = 0.0;

}

void _bin_indices(int *irows, int nrows, const double *y, unsigned long ny, double sc, double offs)

{

int i;

if (sc * (y[ny - 1] - y[0]) > 0) {

int ii = 0;

int iilast = (int)ny - 1;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii + 1] - offs));

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii < iilast) {

ii++;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii + 1] - offs));

}

if (i >= iy0 && i <= iy1)

irows[i] = ii;

else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

} else {

int iilast = (int)ny - 1;

int ii = iilast;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii - 1] - offs));

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii > 1) {

ii--;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii - 1] - offs));

}

if (i >= iy0 && i <= iy1)

irows[i] = ii - 1;

else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

void _bin_indices_linear(

float *arows, int *irows, int nrows, double *y, unsigned long ny, double sc, double offs)

{

int i;

if (sc * (y[ny - 1] - y[0]) > 0) {

int ii = 0;

int iilast = (int)ny - 1;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii + 1] - offs));

float invgap = 1.0 / (iy1 - iy0);

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii < iilast) {

ii++;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii + 1] - offs));

invgap = 1.0 / (iy1 - iy0);

}

if (i >= iy0 && i <= iy1) {

irows[i] = ii;

arows[i] = (iy1 - i) * invgap;

} else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

} else {

int iilast = (int)ny - 1;

int ii = iilast;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii - 1] - offs));

float invgap = 1.0 / (iy1 - iy0);

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii > 1) {

ii--;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii - 1] - offs));

invgap = 1.0 / (iy1 - iy0);

}

if (i >= iy0 && i <= iy1) {

irows[i] = ii - 1;

arows[i] = (i - iy0) * invgap;

} else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

matplotlib/src/_image.cpp at master · psinger/matplotlib · GitHub

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