sequencer_scopes.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Author: Peter Schlaile < peter [at] schlaile [dot] de >
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include <math.h>
#include <string.h>

#include "BLI_math_color.h"
#include "BLI_utildefines.h"

#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"

#include "sequencer_intern.h"

/* XXX, why is this function better then BLI_math version?
 * only difference is it does some normalize after, need to double check on this - campbell */
static void rgb_to_yuv_normalized(const float rgb[3], float yuv[3])
{
        yuv[0]= 0.299f*rgb[0] + 0.587f*rgb[1] + 0.114f*rgb[2];
        yuv[1]= 0.492f*(rgb[2] - yuv[0]);
        yuv[2]= 0.877f*(rgb[0] - yuv[0]);

        /* Normalize */
        yuv[1]*= 255.0f/(122*2.0f);
        yuv[1]+= 0.5f;

        yuv[2]*= 255.0f/(157*2.0f);
        yuv[2]+= 0.5f;
}

static void scope_put_pixel(unsigned char* table, unsigned char * pos)
{
    char newval = table[*pos];
    pos[0] = pos[1] = pos[2] = newval;
    pos[3] = 255;
}

static void scope_put_pixel_single(unsigned char* table, unsigned char * pos,
                   int col)
{
    char newval = table[pos[col]];
    pos[col] = newval;
    pos[3] = 255;
}

static void wform_put_line(int w,
               unsigned char * last_pos, unsigned char * new_pos)
{
    if (last_pos > new_pos) {
        unsigned char* temp = new_pos;
        new_pos = last_pos;
        last_pos = temp;
    }

    while (last_pos < new_pos) {
        if (last_pos[0] == 0) {
            last_pos[0] = last_pos[1] = last_pos[2] = 32;
            last_pos[3] = 255;
        }
        last_pos += 4*w;
    }
}

static void wform_put_line_single(
    int w, unsigned char * last_pos, unsigned char * new_pos, int col)
{
    if (last_pos > new_pos) {
        unsigned char* temp = new_pos;
        new_pos = last_pos;
        last_pos = temp;
    }

    while (last_pos < new_pos) {
        if (last_pos[col] == 0) {
            last_pos[col] = 32;
            last_pos[3] = 255;
        }
        last_pos += 4*w;
    }
}

static void wform_put_border(unsigned char * tgt, int w, int h)
{
    int x, y;

    for (x = 0; x < w; x++) {
        unsigned char * p = tgt + 4 * x;
        p[1] = p[3] = 255.0;
        p[4 * w + 1] = p[4 * w + 3] = 255.0;
        p = tgt + 4 * (w * (h - 1) + x);
        p[1] = p[3] = 255.0;
        p[-4 * w + 1] = p[-4 * w + 3] = 255.0;
    }

    for (y = 0; y < h; y++) {
        unsigned char * p = tgt + 4 * w * y;
        p[1] = p[3] = 255.0;
        p[4 + 1] = p[4 + 3] = 255.0;
        p = tgt + 4 * (w * y + w - 1);
        p[1] = p[3] = 255.0;
        p[-4 + 1] = p[-4 + 3] = 255.0;
    }
}

static void wform_put_gridrow(unsigned char * tgt, float perc, int w, int h)
{
    int i;

    tgt += (int) (perc/100.0f * h) * w * 4;

    for (i = 0; i < w*2; i++) {
        tgt[0] = 255;

        tgt += 4;
    }
}

static void wform_put_grid(unsigned char * tgt, int w, int h)
{
    wform_put_gridrow(tgt, 90.0, w, h);
    wform_put_gridrow(tgt, 70.0, w, h);
    wform_put_gridrow(tgt, 10.0, w, h);
}

static struct ImBuf *make_waveform_view_from_ibuf_byte(struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(ibuf->x + 3, 515, 32, IB_rect);
    int x,y;
    unsigned char* src = (unsigned char*) ibuf->rect;
    unsigned char* tgt = (unsigned char*) rval->rect;
    int w = ibuf->x + 3;
    int h = 515;
    float waveform_gamma = 0.2;
    unsigned char wtable[256];

    wform_put_grid(tgt, w, h);

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         waveform_gamma)*255);
    }

    for (y = 0; y < ibuf->y; y++) {
        unsigned char * last_p = NULL;

        for (x = 0; x < ibuf->x; x++) {
            unsigned char * rgb = src + 4 * (ibuf->x * y + x);
            float v = (float)rgb_to_luma_byte(rgb) / 255.0;
            unsigned char * p = tgt;
            p += 4 * (w * ((int) (v * (h - 3)) + 1) + x + 1);

            scope_put_pixel(wtable, p);
            p += 4 * w;
            scope_put_pixel(wtable, p);

            if (last_p != NULL) {
                wform_put_line(w, last_p, p);
            }
            last_p = p;
        }
    }

    wform_put_border(tgt, w, h);
    
    return rval;
}

static struct ImBuf *make_waveform_view_from_ibuf_float(struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(ibuf->x + 3, 515, 32, IB_rect);
    int x,y;
    float* src = ibuf->rect_float;
    unsigned char* tgt = (unsigned char*) rval->rect;
    int w = ibuf->x + 3;
    int h = 515;
    float waveform_gamma = 0.2;
    unsigned char wtable[256];

    wform_put_grid(tgt, w, h);

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         waveform_gamma)*255);
    }

    for (y = 0; y < ibuf->y; y++) {
        unsigned char * last_p = NULL;

        for (x = 0; x < ibuf->x; x++) {
            float * rgb = src + 4 * (ibuf->x * y + x);
            float v = rgb_to_luma(rgb);
            unsigned char * p = tgt;

            CLAMP(v, 0.0f, 1.0f);

            p += 4 * (w * ((int) (v * (h - 3)) + 1) + x + 1);

            scope_put_pixel(wtable, p);
            p += 4 * w;
            scope_put_pixel(wtable, p);

            if (last_p != NULL) {
                wform_put_line(w, last_p, p);
            }
            last_p = p;
        }
    }

    wform_put_border(tgt, w, h);
    
    return rval;
}

struct ImBuf *make_waveform_view_from_ibuf(struct ImBuf * ibuf)
{
    if (ibuf->rect_float) {
        return make_waveform_view_from_ibuf_float(ibuf);
    } else {
        return make_waveform_view_from_ibuf_byte(ibuf);
    }
}


static struct ImBuf *make_sep_waveform_view_from_ibuf_byte(struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(
        ibuf->x + 3, 515, 32, IB_rect);
    int x,y;
    unsigned char* src = (unsigned char*) ibuf->rect;
    unsigned char* tgt = (unsigned char*) rval->rect;
    int w = ibuf->x + 3;
    int sw = ibuf->x/3;
    int h = 515;
    float waveform_gamma = 0.2;
    unsigned char wtable[256];

    wform_put_grid(tgt, w, h);

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         waveform_gamma)*255);
    }

    for (y = 0; y < ibuf->y; y++) {
        unsigned char *last_p[3] = {NULL, NULL, NULL};

        for (x = 0; x < ibuf->x; x++) {
            int c;
            unsigned char * rgb = src + 4 * (ibuf->x * y + x);
            for (c = 0; c < 3; c++) {
                unsigned char * p = tgt;
                p += 4 * (w * ((rgb[c] * (h - 3))/255 + 1) 
                      + c * sw + x/3 + 1);

                scope_put_pixel_single(wtable, p, c);
                p += 4 * w;
                scope_put_pixel_single(wtable, p, c);

                if (last_p[c] != NULL) {
                    wform_put_line_single(
                        w, last_p[c], p, c);
                }
                last_p[c] = p;
            }
        }
    }

    wform_put_border(tgt, w, h);
    
    return rval;
}

static struct ImBuf *make_sep_waveform_view_from_ibuf_float(
    struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(
        ibuf->x + 3, 515, 32, IB_rect);
    int x,y;
    float* src = ibuf->rect_float;
    unsigned char* tgt = (unsigned char*) rval->rect;
    int w = ibuf->x + 3;
    int sw = ibuf->x/3;
    int h = 515;
    float waveform_gamma = 0.2;
    unsigned char wtable[256];

    wform_put_grid(tgt, w, h);

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         waveform_gamma)*255);
    }

    for (y = 0; y < ibuf->y; y++) {
        unsigned char *last_p[3] = {NULL, NULL, NULL};

        for (x = 0; x < ibuf->x; x++) {
            int c;
            float * rgb = src + 4 * (ibuf->x * y + x);
            for (c = 0; c < 3; c++) {
                unsigned char * p = tgt;
                float v = rgb[c];

                CLAMP(v, 0.0f, 1.0f);

                p += 4 * (w * ((int) (v * (h - 3)) + 1)
                      + c * sw + x/3 + 1);

                scope_put_pixel_single(wtable, p, c);
                p += 4 * w;
                scope_put_pixel_single(wtable, p, c);

                if (last_p[c] != NULL) {
                    wform_put_line_single(
                        w, last_p[c], p, c);
                }
                last_p[c] = p;
            }
        }
    }

    wform_put_border(tgt, w, h);
    
    return rval;
}

struct ImBuf *make_sep_waveform_view_from_ibuf(struct ImBuf * ibuf)
{
    if (ibuf->rect_float) {
        return make_sep_waveform_view_from_ibuf_float(ibuf);
    } else {
        return make_sep_waveform_view_from_ibuf_byte(ibuf);
    }
}

static void draw_zebra_byte(struct ImBuf * src,struct ImBuf * ibuf, float perc)
{
    unsigned int limit = 255.0f * perc / 100.0f;
    unsigned char * p = (unsigned char*) src->rect;
    unsigned char * o = (unsigned char*) ibuf->rect;
    int x;
    int y;

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            unsigned char r = *p++;
            unsigned char g = *p++;
            unsigned char b = *p++;
            unsigned char a = *p++;

            if (r >= limit || g >= limit || b >= limit) {
                if (((x + y) & 0x08) != 0) {
                    r = 255 - r;
                    g = 255 - g;
                    b = 255 - b;
                }
            }
            *o++ = r;
            *o++ = g;
            *o++ = b;
            *o++ = a;
        }
    }
}


static void draw_zebra_float(struct ImBuf * src,struct ImBuf * ibuf,float perc)
{
    float limit = perc / 100.0f;
    float * p = src->rect_float;
    unsigned char * o = (unsigned char*) ibuf->rect;
    int x;
    int y;

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            float r = *p++;
            float g = *p++;
            float b = *p++;
            float a = *p++;

            if (r >= limit || g >= limit || b >= limit) {
                if (((x + y) & 0x08) != 0) {
                    r = -r;
                    g = -g;
                    b = -b;
                }
            }

            *o++ = FTOCHAR(r);
            *o++ = FTOCHAR(g);
            *o++ = FTOCHAR(b);
            *o++ = FTOCHAR(a);
        }
    }
}

struct ImBuf * make_zebra_view_from_ibuf(struct ImBuf * src, float perc)
{
    struct ImBuf * ibuf = IMB_allocImBuf(src->x, src->y, 32, IB_rect);

    if (src->rect_float) {
        draw_zebra_float(src, ibuf, perc);
    } else {
        draw_zebra_byte(src, ibuf, perc);
    }
    return ibuf;
}

static void draw_histogram_marker(struct ImBuf * ibuf, int x)
{
    unsigned char * p = (unsigned char*) ibuf->rect;
    int barh = ibuf->y * 0.1;
    int i;

    p += 4 * (x + ibuf->x * (ibuf->y - barh + 1));

    for (i = 0; i < barh-1; i++) {
        p[0] = p[1] = p[2] = 255;
        p += ibuf->x * 4;
    }
}

static void draw_histogram_bar(struct ImBuf * ibuf, int x,float val, int col)
{
    unsigned char * p = (unsigned char*) ibuf->rect;
    int barh = ibuf->y * val * 0.9f;
    int i;

    p += 4 * (x + ibuf->x);

    for (i = 0; i < barh; i++) {
        p[col] = 255;
        p += ibuf->x * 4;
    }
}

static struct ImBuf *make_histogram_view_from_ibuf_byte(
    struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(515, 128, 32, IB_rect);
    int c,x,y;
    unsigned int n;
    unsigned char* src = (unsigned char*) ibuf->rect;

    unsigned int bins[3][256];

    memset(bins, 0, 3 * 256* sizeof(unsigned int));

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            bins[0][*src++]++;
            bins[1][*src++]++;
            bins[2][*src++]++;
            src++;
        }
    }

    n = 0;
    for (c = 0; c < 3; c++) {
        for (x = 0; x < 256; x++) {
            if (bins[c][x] > n) {
                n = bins[c][x];
            }
        }
    }

    for (c = 0; c < 3; c++) {
        for (x = 0; x < 256; x++) {
            draw_histogram_bar(rval, x*2+1, 
                       ((float) bins[c][x])/n, c);
            draw_histogram_bar(rval, x*2+2, 
                       ((float) bins[c][x])/n, c);
        }
    }

    wform_put_border((unsigned char*) rval->rect, rval->x, rval->y);
    
    return rval;
}

static int get_bin_float(float f)
{
    if (f < -0.25f) {
        f = -0.25f;
    } else if (f > 1.25f) {
        f = 1.25f;
    }

    return (int) (((f + 0.25f) / 1.5f) * 512);
}

static struct ImBuf *make_histogram_view_from_ibuf_float(
    struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(515, 128, 32, IB_rect);
    int n,c,x,y;
    float* src = ibuf->rect_float;

    unsigned int bins[3][512];

    memset(bins, 0, 3 * 256* sizeof(unsigned int));

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            bins[0][get_bin_float(*src++)]++;
            bins[1][get_bin_float(*src++)]++;
            bins[2][get_bin_float(*src++)]++;
            src++;
        }
    }

    draw_histogram_marker(rval, get_bin_float(0.0));
    draw_histogram_marker(rval, get_bin_float(1.0));

    n = 0;
    for (c = 0; c < 3; c++) {
        for (x = 0; x < 512; x++) {
            if (bins[c][x] > n) {
                n = bins[c][x];
            }
        }
    }
    for (c = 0; c < 3; c++) {
        for (x = 0; x < 512; x++) {
            draw_histogram_bar(rval, x+1, (float) bins[c][x]/n, c);
        }
    }

    wform_put_border((unsigned char*) rval->rect, rval->x, rval->y);
    
    return rval;
}

struct ImBuf *make_histogram_view_from_ibuf(struct ImBuf * ibuf)
{
    if (ibuf->rect_float) {
        return make_histogram_view_from_ibuf_float(ibuf);
    } else {
        return make_histogram_view_from_ibuf_byte(ibuf);
    }
}

static void vectorscope_put_cross(unsigned char r, unsigned char g, 
                  unsigned char b, 
                  char * tgt, int w, int h, int size)
{
    float rgb[3], yuv[3];
    char * p;
    int x = 0;
    int y = 0;

    rgb[0]= (float)r/255.0f;
    rgb[1]= (float)g/255.0f;
    rgb[2]= (float)b/255.0f;
    rgb_to_yuv_normalized(rgb, yuv);
            
    p = tgt + 4 * (w * (int) ((yuv[2] * (h - 3) + 1)) 
               + (int) ((yuv[1] * (w - 3) + 1)));

    if (r == 0 && g == 0 && b == 0) {
        r = 255;
    }

    for (y = -size; y <= size; y++) {
        for (x = -size; x <= size; x++) {
            char * q = p + 4 * (y * w + x);
            q[0] = r; q[1] = g; q[2] = b; q[3] = 255;
        }
    }
}

static struct ImBuf *make_vectorscope_view_from_ibuf_byte(struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(515, 515, 32, IB_rect);
    int x,y;
    char* src = (char*) ibuf->rect;
    char* tgt = (char*) rval->rect;
    float rgb[3], yuv[3];
    int w = 515;
    int h = 515;
    float scope_gamma = 0.2;
    unsigned char wtable[256];

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         scope_gamma)*255);
    }

    for (x = 0; x <= 255; x++) {
        vectorscope_put_cross(255   ,     0,255 - x, tgt, w, h, 1);
        vectorscope_put_cross(255   ,     x,      0, tgt, w, h, 1);
        vectorscope_put_cross(255- x,   255,      0, tgt, w, h, 1);
        vectorscope_put_cross(0,        255,      x, tgt, w, h, 1);
        vectorscope_put_cross(0,    255 - x,    255, tgt, w, h, 1);
        vectorscope_put_cross(x,          0,    255, tgt, w, h, 1);
    }

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            char * src1 = src + 4 * (ibuf->x * y + x);
            char * p;
            
            rgb[0]= (float)src1[0]/255.0f;
            rgb[1]= (float)src1[1]/255.0f;
            rgb[2]= (float)src1[2]/255.0f;
            rgb_to_yuv_normalized(rgb, yuv);
            
            p = tgt + 4 * (w * (int) ((yuv[2] * (h - 3) + 1)) 
                       + (int) ((yuv[1] * (w - 3) + 1)));
            scope_put_pixel(wtable, (unsigned char*)p);
        }
    }

    vectorscope_put_cross(0, 0, 0, tgt, w, h, 3);

    return rval;
}

static struct ImBuf *make_vectorscope_view_from_ibuf_float(struct ImBuf * ibuf)
{
    struct ImBuf * rval = IMB_allocImBuf(515, 515, 32, IB_rect);
    int x,y;
    float* src = ibuf->rect_float;
    char* tgt = (char*) rval->rect;
    float rgb[3], yuv[3];
    int w = 515;
    int h = 515;
    float scope_gamma = 0.2;
    unsigned char wtable[256];

    for (x = 0; x < 256; x++) {
        wtable[x] = (unsigned char) (pow(((float) x + 1)/256, 
                         scope_gamma)*255);
    }

    for (x = 0; x <= 255; x++) {
        vectorscope_put_cross(255   ,     0,255 - x, tgt, w, h, 1);
        vectorscope_put_cross(255   ,     x,      0, tgt, w, h, 1);
        vectorscope_put_cross(255- x,   255,      0, tgt, w, h, 1);
        vectorscope_put_cross(0,        255,      x, tgt, w, h, 1);
        vectorscope_put_cross(0,    255 - x,    255, tgt, w, h, 1);
        vectorscope_put_cross(x,          0,    255, tgt, w, h, 1);
    }

    for (y = 0; y < ibuf->y; y++) {
        for (x = 0; x < ibuf->x; x++) {
            float * src1 = src + 4 * (ibuf->x * y + x);
            char * p;
            
            memcpy(rgb, src1, 3 * sizeof(float));

            CLAMP(rgb[0], 0.0f, 1.0f);
            CLAMP(rgb[1], 0.0f, 1.0f);
            CLAMP(rgb[2], 0.0f, 1.0f);

            rgb_to_yuv_normalized(rgb, yuv);
            
            p = tgt + 4 * (w * (int) ((yuv[2] * (h - 3) + 1)) 
                       + (int) ((yuv[1] * (w - 3) + 1)));
            scope_put_pixel(wtable, (unsigned char*)p);
        }
    }

    vectorscope_put_cross(0, 0, 0, tgt, w, h, 3);

    return rval;
}

struct ImBuf *make_vectorscope_view_from_ibuf(struct ImBuf * ibuf)
{
    if (ibuf->rect_float) {
        return make_vectorscope_view_from_ibuf_float(ibuf);
    } else {
        return make_vectorscope_view_from_ibuf_byte(ibuf);
    }
}