sequencer_draw.c

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/*
 * $Id: sequencer_draw.c 38978 2011-08-03 09:28:16Z campbellbarton $
 *
 * ***** 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation, 2003-2009
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "IMB_imbuf_types.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_userdef_types.h"
#include "DNA_sound_types.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_sequencer.h"

#include "BKE_sound.h"

#include "IMB_imbuf.h"

#include "BIF_gl.h"
#include "BIF_glutil.h"

#include "ED_anim_api.h"
#include "ED_markers.h"
#include "ED_types.h"

#include "UI_interface.h"
#include "UI_resources.h"
#include "UI_view2d.h"

/* own include */
#include "sequencer_intern.h"


#define SEQ_LEFTHANDLE          1
#define SEQ_RIGHTHANDLE 2


/* Note, Dont use WHILE_SEQ while drawing! - it messes up transform, - Campbell */
static void draw_shadedstrip(Sequence *seq, unsigned char col[3], float x1, float y1, float x2, float y2);

static void get_seq_color3ubv(Scene *curscene, Sequence *seq, unsigned char col[3])
{
        unsigned char blendcol[3];
        SolidColorVars *colvars = (SolidColorVars *)seq->effectdata;

        switch(seq->type) {
        case SEQ_IMAGE:
                UI_GetThemeColor3ubv(TH_SEQ_IMAGE, col);
                break;
                
        case SEQ_META:
                UI_GetThemeColor3ubv(TH_SEQ_META, col);
                break;
                
        case SEQ_MOVIE:
                UI_GetThemeColor3ubv(TH_SEQ_MOVIE, col);
                break;
                
        case SEQ_SCENE:
                UI_GetThemeColor3ubv(TH_SEQ_SCENE, col);
                
                if(seq->scene==curscene) {
                        UI_GetColorPtrBlendShade3ubv(col, col, col, 1.0, 20);
                }
                break;
                
        /* transitions */
        case SEQ_CROSS:
        case SEQ_GAMCROSS:
        case SEQ_WIPE:
                UI_GetThemeColor3ubv(TH_SEQ_TRANSITION, col);

                /* slightly offset hue to distinguish different effects */
                if (seq->type == SEQ_CROSS)                     rgb_byte_set_hue_float_offset(col,0.04);
                if (seq->type == SEQ_GAMCROSS)          rgb_byte_set_hue_float_offset(col,0.08);
                if (seq->type == SEQ_WIPE)                      rgb_byte_set_hue_float_offset(col,0.12);
                break;
                
        /* effects */
        case SEQ_TRANSFORM:
        case SEQ_SPEED:
        case SEQ_ADD:
        case SEQ_SUB:
        case SEQ_MUL:
        case SEQ_ALPHAOVER:
        case SEQ_ALPHAUNDER:
        case SEQ_OVERDROP:
        case SEQ_GLOW:
        case SEQ_MULTICAM:
        case SEQ_ADJUSTMENT:
                UI_GetThemeColor3ubv(TH_SEQ_EFFECT, col);
                
                /* slightly offset hue to distinguish different effects */
                if (seq->type == SEQ_ADD)                       rgb_byte_set_hue_float_offset(col,0.04);
                if (seq->type == SEQ_SUB)                       rgb_byte_set_hue_float_offset(col,0.08);
                if (seq->type == SEQ_MUL)                       rgb_byte_set_hue_float_offset(col,0.12);
                if (seq->type == SEQ_ALPHAOVER)         rgb_byte_set_hue_float_offset(col,0.16);
                if (seq->type == SEQ_ALPHAUNDER)        rgb_byte_set_hue_float_offset(col,0.20);
                if (seq->type == SEQ_OVERDROP)          rgb_byte_set_hue_float_offset(col,0.24);
                if (seq->type == SEQ_GLOW)                      rgb_byte_set_hue_float_offset(col,0.28);
                if (seq->type == SEQ_TRANSFORM)         rgb_byte_set_hue_float_offset(col,0.36);
                if (seq->type == SEQ_MULTICAM)          rgb_byte_set_hue_float_offset(col,0.32);
                if (seq->type == SEQ_ADJUSTMENT)                rgb_byte_set_hue_float_offset(col,0.40);
                break;
                
        case SEQ_COLOR:
                if (colvars->col) {
                        rgb_float_to_byte(colvars->col, col);
                } else {
                        col[0] = col[1] = col[2] = 128;
                }
                break;
                
        case SEQ_PLUGIN:
                UI_GetThemeColor3ubv(TH_SEQ_PLUGIN, col);
                break;
                
        case SEQ_SOUND:
                UI_GetThemeColor3ubv(TH_SEQ_AUDIO, col);
                blendcol[0] = blendcol[1] = blendcol[2] = 128;
                if(seq->flag & SEQ_MUTE) UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.5, 20);
                break;
                
        default:
                col[0] = 10; col[1] = 255; col[2] = 40;
        }
}

static void drawseqwave(Scene *scene, Sequence *seq, float x1, float y1, float x2, float y2, float stepsize)
{
        /*
        x1 is the starting x value to draw the wave,
        x2 the end x value, same for y1 and y2
        stepsize is width of a pixel.
        */
        if(seq->sound->cache)
        {
                int i;
                int length = floor((x2-x1)/stepsize)+1;
                float ymid = (y1+y2)/2;
                float yscale = (y2-y1)/2;
                float* samples = MEM_mallocN(length * sizeof(float) * 2, "seqwave_samples");
                if(!samples)
                        return;
                if(sound_read_sound_buffer(seq->sound, samples, length,
                                                                   (seq->startofs + seq->anim_startofs)/FPS,
                                                                   (seq->startofs + seq->anim_startofs + seq->enddisp - seq->startdisp)/FPS) != length)
                {
                        MEM_freeN(samples);
                        return;
                }
                glBegin(GL_LINES);
                for(i = 0; i < length; i++)
                {
                        glVertex2f(x1+i*stepsize, ymid + samples[i * 2] * yscale);
                        glVertex2f(x1+i*stepsize, ymid + samples[i * 2 + 1] * yscale);
                }
                glEnd();
                MEM_freeN(samples);
        }
}

static void drawmeta_stipple(int value)
{
        if(value) {
                glEnable(GL_POLYGON_STIPPLE);
                glPolygonStipple(stipple_halftone);
                
                glEnable(GL_LINE_STIPPLE);
                glLineStipple(1, 0x8888);
        }
        else {
                glDisable(GL_POLYGON_STIPPLE);
                glDisable(GL_LINE_STIPPLE);
        }
}

static void drawmeta_contents(Scene *scene, Sequence *seqm, float x1, float y1, float x2, float y2)
{
        /* Note, this used to use WHILE_SEQ, but it messes up the seq->depth value, (needed by transform when doing overlap checks)
         * so for now, just use the meta's immediate children, could be fixed but its only drawing - Campbell */
        Sequence *seq;
        unsigned char col[4];

        int chan_min= MAXSEQ;
        int chan_max= 0;
        int chan_range= 0;
        float draw_range= y2 - y1;
        float draw_height;

        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

        if(seqm->flag & SEQ_MUTE)
                drawmeta_stipple(1);

        for (seq= seqm->seqbase.first; seq; seq= seq->next) {
                chan_min= MIN2(chan_min, seq->machine);
                chan_max= MAX2(chan_max, seq->machine);
        }

        chan_range= (chan_max - chan_min) + 1;
        draw_height= draw_range / chan_range; 

        col[3]= 196; /* alpha, used for all meta children */

        for (seq= seqm->seqbase.first; seq; seq= seq->next) {
                if((seq->startdisp > x2 || seq->enddisp < x1) == 0) {
                        float y_chan= (seq->machine - chan_min) / (float)(chan_range) * draw_range;
                        float x1_chan= seq->startdisp;
                        float x2_chan= seq->enddisp;
                        float y1_chan, y2_chan;

                        if((seqm->flag & SEQ_MUTE) == 0 && (seq->flag & SEQ_MUTE))
                                drawmeta_stipple(1);

                        get_seq_color3ubv(scene, seq, col);

                        glColor4ubv(col);
                        
                        /* clamp within parent sequence strip bounds */
                        if(x1_chan < x1) x1_chan= x1;
                        if(x2_chan > x2) x2_chan= x2;

                        y1_chan= y1 + y_chan + (draw_height * SEQ_STRIP_OFSBOTTOM);
                        y2_chan= y1 + y_chan + (draw_height * SEQ_STRIP_OFSTOP);

                        glRectf(x1_chan,  y1_chan, x2_chan,  y2_chan);

                        UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -30);
                        glColor4ubv(col);
                        fdrawbox(x1_chan,  y1_chan, x2_chan,  y2_chan);

                        if((seqm->flag & SEQ_MUTE) == 0 && (seq->flag & SEQ_MUTE))
                                drawmeta_stipple(0);
                }
        }

        if (seqm->flag & SEQ_MUTE)
                drawmeta_stipple(0);
        
        glDisable(GL_BLEND);
}

/* draw a handle, for each end of a sequence strip */
static void draw_seq_handle(View2D *v2d, Sequence *seq, float pixelx, short direction)
{
        float v1[2], v2[2], v3[2], rx1=0, rx2=0; //for triangles and rect
        float x1, x2, y1, y2;
        float handsize;
        float minhandle, maxhandle;
        char str[32];
        unsigned int whichsel=0;
        
        x1= seq->startdisp;
        x2= seq->enddisp;
        
        y1= seq->machine+SEQ_STRIP_OFSBOTTOM;
        y2= seq->machine+SEQ_STRIP_OFSTOP;
        
        /* clamp handles to defined size in pixel space */
        handsize = seq->handsize;
        minhandle = 7;
        maxhandle = 40;
        CLAMP(handsize, minhandle*pixelx, maxhandle*pixelx);
        
        /* set up co-ordinates/dimensions for either left or right handle */
        if (direction == SEQ_LEFTHANDLE) {      
                rx1 = x1;
                rx2 = x1+handsize * 0.75f;
                
                v1[0]= x1+handsize/4; v1[1]= y1+( ((y1+y2)/2.0f - y1)/2);
                v2[0]= x1+handsize/4; v2[1]= y2-( ((y1+y2)/2.0f - y1)/2);
                v3[0]= v2[0] + handsize/4; v3[1]= (y1+y2)/2.0f;
                
                whichsel = SEQ_LEFTSEL;
        } else if (direction == SEQ_RIGHTHANDLE) {      
                rx1 = x2-handsize*0.75f;
                rx2 = x2;
                
                v1[0]= x2-handsize/4; v1[1]= y1+( ((y1+y2)/2.0f - y1)/2);
                v2[0]= x2-handsize/4; v2[1]= y2-( ((y1+y2)/2.0f - y1)/2);
                v3[0]= v2[0] - handsize/4; v3[1]= (y1+y2)/2.0f;
                
                whichsel = SEQ_RIGHTSEL;
        }
        
        /* draw! */
        if(seq->type < SEQ_EFFECT || 
           get_sequence_effect_num_inputs(seq->type) == 0) {
                glEnable( GL_BLEND );
                
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                
                if(seq->flag & whichsel) glColor4ub(0, 0, 0, 80);
                else if (seq->flag & SELECT) glColor4ub(255, 255, 255, 30);
                else glColor4ub(0, 0, 0, 22);
                
                glRectf(rx1, y1, rx2, y2);
                
                if(seq->flag & whichsel) glColor4ub(255, 255, 255, 200);
                else glColor4ub(0, 0, 0, 50);
                
                glEnable( GL_POLYGON_SMOOTH );
                glBegin(GL_TRIANGLES);
                glVertex2fv(v1); glVertex2fv(v2); glVertex2fv(v3);
                glEnd();
                
                glDisable( GL_POLYGON_SMOOTH );
                glDisable( GL_BLEND );
        }
        
        if(G.moving || (seq->flag & whichsel)) {
                const char col[4]= {255, 255, 255, 255};
                if (direction == SEQ_LEFTHANDLE) {
                        sprintf(str, "%d", seq->startdisp);
                        x1= rx1;
                        y1 -= 0.45f;
                } else {
                        sprintf(str, "%d", seq->enddisp - 1);
                        x1= x2 - handsize*0.75f;
                        y1= y2 + 0.05f;
                }
                UI_view2d_text_cache_add(v2d, x1, y1, str, col);
        }       
}

static void draw_seq_extensions(Scene *scene, ARegion *ar, Sequence *seq)
{
        float x1, x2, y1, y2, pixely, a;
        unsigned char col[3], blendcol[3];
        View2D *v2d= &ar->v2d;
        
        if(seq->type >= SEQ_EFFECT) return;

        x1= seq->startdisp;
        x2= seq->enddisp;
        
        y1= seq->machine+SEQ_STRIP_OFSBOTTOM;
        y2= seq->machine+SEQ_STRIP_OFSTOP;

        pixely = (v2d->cur.ymax - v2d->cur.ymin)/(v2d->mask.ymax - v2d->mask.ymin);
        
        if(pixely <= 0) return; /* can happen when the view is split/resized */
        
        blendcol[0] = blendcol[1] = blendcol[2] = 120;

        if(seq->startofs) {
                glEnable( GL_BLEND );
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                
                get_seq_color3ubv(scene, seq, col);
                
                if (seq->flag & SELECT) {
                        UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.3, -40);
                        glColor4ub(col[0], col[1], col[2], 170);
                } else {
                        UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.6, 0);
                        glColor4ub(col[0], col[1], col[2], 110);
                }
                
                glRectf((float)(seq->start), y1-SEQ_STRIP_OFSBOTTOM, x1, y1);
                
                if (seq->flag & SELECT) glColor4ub(col[0], col[1], col[2], 255);
                else glColor4ub(col[0], col[1], col[2], 160);

                fdrawbox((float)(seq->start), y1-SEQ_STRIP_OFSBOTTOM, x1, y1);  //outline
                
                glDisable( GL_BLEND );
        }
        if(seq->endofs) {
                glEnable( GL_BLEND );
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                
                get_seq_color3ubv(scene, seq, col);
                
                if (seq->flag & SELECT) {
                        UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.3, -40);
                        glColor4ub(col[0], col[1], col[2], 170);
                } else {
                        UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.6, 0);
                        glColor4ub(col[0], col[1], col[2], 110);
                }
                
                glRectf(x2, y2, (float)(seq->start+seq->len), y2+SEQ_STRIP_OFSBOTTOM);
                
                if (seq->flag & SELECT) glColor4ub(col[0], col[1], col[2], 255);
                else glColor4ub(col[0], col[1], col[2], 160);

                fdrawbox(x2, y2, (float)(seq->start+seq->len), y2+SEQ_STRIP_OFSBOTTOM); //outline
                
                glDisable( GL_BLEND );
        }
        if(seq->startstill) {
                get_seq_color3ubv(scene, seq, col);
                UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.75, 40);
                glColor3ubv((GLubyte *)col);
                
                draw_shadedstrip(seq, col, x1, y1, (float)(seq->start), y2);
                
                /* feint pinstripes, helps see exactly which is extended and which isn't,
                * especially when the extension is very small */ 
                if (seq->flag & SELECT) UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 24);
                else UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -16);
                
                glColor3ubv((GLubyte *)col);
                
                for(a=y1; a< y2; a+= pixely * 2.0f) {
                        fdrawline(x1,  a,  (float)(seq->start),  a);
                }
        }
        if(seq->endstill) {
                get_seq_color3ubv(scene, seq, col);
                UI_GetColorPtrBlendShade3ubv(col, blendcol, col, 0.75, 40);
                glColor3ubv((GLubyte *)col);
                
                draw_shadedstrip(seq, col, (float)(seq->start+seq->len), y1, x2, y2);
                
                /* feint pinstripes, helps see exactly which is extended and which isn't,
                * especially when the extension is very small */ 
                if (seq->flag & SELECT) UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 24);
                else UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -16);
                
                glColor3ubv((GLubyte *)col);
                
                for(a=y1; a< y2; a+= pixely * 2.0f) {
                        fdrawline((float)(seq->start+seq->len),  a,  x2,  a);
                }
        }
}

/* draw info text on a sequence strip */
static void draw_seq_text(View2D *v2d, Sequence *seq, float x1, float x2, float y1, float y2, const unsigned char background_col[3])
{
        rctf rect;
        char str[32 + FILE_MAXDIR+FILE_MAXFILE];
        const char *name= seq->name+2;
        char col[4];
        
        if(name[0]=='\0')
                name= give_seqname(seq);

        if(seq->type == SEQ_META || seq->type == SEQ_ADJUSTMENT) {
                sprintf(str, "%d | %s", seq->len, name);
        }
        else if(seq->type == SEQ_SCENE) {
                if(seq->scene) {
                        if(seq->scene_camera) {
                                sprintf(str, "%d | %s: %s (%s)", seq->len, name, seq->scene->id.name+2, ((ID *)seq->scene_camera)->name+2);
                        } else {
                                sprintf(str, "%d | %s: %s", seq->len, name, seq->scene->id.name+2);
                        }
                }
                else {
                        sprintf(str, "%d | %s", seq->len, name);
                }
        }
        else if(seq->type == SEQ_MULTICAM) {
                sprintf(str, "Cam: %d", seq->multicam_source);
        }
        else if(seq->type == SEQ_IMAGE) {
                sprintf(str, "%d | %s%s", seq->len, seq->strip->dir, seq->strip->stripdata->name);
        }
        else if(seq->type & SEQ_EFFECT) {
                int can_float = (seq->type != SEQ_PLUGIN)
                        || (seq->plugin && seq->plugin->version >= 4);

                if(seq->seq3!=seq->seq2 && seq->seq1!=seq->seq3)
                        sprintf(str, "%d | %s: %d>%d (use %d)%s", seq->len, name, seq->seq1->machine, seq->seq2->machine, seq->seq3->machine, can_float ? "" : " No float, upgrade plugin!");
                else if (seq->seq1 && seq->seq2)
                        sprintf(str, "%d | %s: %d>%d%s", seq->len, name, seq->seq1->machine, seq->seq2->machine, can_float ? "" : " No float, upgrade plugin!");
                else
                        sprintf(str, "%d | %s", seq->len, name);
        }
        else if (seq->type == SEQ_SOUND) {
                sprintf(str, "%d | %s", seq->len, seq->sound->name);
        }
        else if (seq->type == SEQ_MOVIE) {
                sprintf(str, "%d | %s%s", seq->len, seq->strip->dir, seq->strip->stripdata->name);
        }
        
        if(seq->flag & SELECT){
                col[0]= col[1]= col[2]= 255;
        }else if ((((int)background_col[0] + (int)background_col[1] + (int)background_col[2]) / 3) < 50){
                col[0]= col[1]= col[2]= 80; /* use lighter text color for dark background */
        }else{
                col[0]= col[1]= col[2]= 0;
        }
        col[3]= 255;

        rect.xmin= x1;
        rect.ymin= y1;
        rect.xmax= x2;
        rect.ymax= y2;
        UI_view2d_text_cache_rectf(v2d, &rect, str, col);
}

/* draws a shaded strip, made from gradient + flat color + gradient */
static void draw_shadedstrip(Sequence *seq, unsigned char col[3], float x1, float y1, float x2, float y2)
{
        float ymid1, ymid2;
        
        if (seq->flag & SEQ_MUTE) {
                glEnable(GL_POLYGON_STIPPLE);
                glPolygonStipple(stipple_halftone);
        }
        
        ymid1 = (y2-y1)*0.25f + y1;
        ymid2 = (y2-y1)*0.65f + y1;
        
        glShadeModel(GL_SMOOTH);
        glBegin(GL_QUADS);
        
        if(seq->flag & SEQ_INVALID_EFFECT) { col[0]= 255; col[1]= 0; col[2]= 255; }
        else if(seq->flag & SELECT) UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -50);
        else UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 0);
        
        glColor3ubv(col);
        
        glVertex2f(x1,y1);
        glVertex2f(x2,y1);

        if(seq->flag & SEQ_INVALID_EFFECT) { col[0]= 255; col[1]= 0; col[2]= 255; }
        else if(seq->flag & SELECT) UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 5);
        else UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -5);

        glColor3ubv((GLubyte *)col);
        
        glVertex2f(x2,ymid1);
        glVertex2f(x1,ymid1);
        
        glEnd();
        
        glRectf(x1,  ymid1,  x2,  ymid2);
        
        glBegin(GL_QUADS);
        
        glVertex2f(x1,ymid2);
        glVertex2f(x2,ymid2);
        
        if(seq->flag & SELECT) UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, -15);
        else UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 25);
        
        glColor3ubv((GLubyte *)col);
        
        glVertex2f(x2,y2);
        glVertex2f(x1,y2);
        
        glEnd();
        
        if (seq->flag & SEQ_MUTE) {
                glDisable(GL_POLYGON_STIPPLE);
        }
}

/*
Draw a sequence strip, bounds check already made
ARegion is currently only used to get the windows width in pixels
so wave file sample drawing precision is zoom adjusted
*/
static void draw_seq_strip(Scene *scene, ARegion *ar, Sequence *seq, int outline_tint, float pixelx)
{
        View2D *v2d= &ar->v2d;
        float x1, x2, y1, y2;
        unsigned char col[3], background_col[3], is_single_image;

        /* we need to know if this is a single image/color or not for drawing */
        is_single_image = (char)seq_single_check(seq);
        
        /* body */
        if(seq->startstill) x1= seq->start;
        else x1= seq->startdisp;
        y1= seq->machine+SEQ_STRIP_OFSBOTTOM;
        if(seq->endstill) x2= seq->start+seq->len;
        else x2= seq->enddisp;
        y2= seq->machine+SEQ_STRIP_OFSTOP;
        
        
        /* get the correct color per strip type*/
        //get_seq_color3ubv(scene, seq, col);
        get_seq_color3ubv(scene, seq, background_col);
        
        /* draw the main strip body */
        if (is_single_image) /* single image */
                draw_shadedstrip(seq, background_col, seq_tx_get_final_left(seq, 0), y1, seq_tx_get_final_right(seq, 0), y2);
        else /* normal operation */
                draw_shadedstrip(seq, background_col, x1, y1, x2, y2);
        
        /* draw additional info and controls */
        if (!is_single_image)
                draw_seq_extensions(scene, ar, seq);
        
        draw_seq_handle(v2d, seq, pixelx, SEQ_LEFTHANDLE);
        draw_seq_handle(v2d, seq, pixelx, SEQ_RIGHTHANDLE);
        
        /* draw the strip outline */
        x1= seq->startdisp;
        x2= seq->enddisp;
        
        /* draw sound wave */
        if(seq->type == SEQ_SOUND) drawseqwave(scene, seq, x1, y1, x2, y2, (ar->v2d.cur.xmax - ar->v2d.cur.xmin)/ar->winx);

        /* draw lock */
        if(seq->flag & SEQ_LOCK) {
                glEnable(GL_POLYGON_STIPPLE);
                glEnable(GL_BLEND);

                /* light stripes */
                glColor4ub(255, 255, 255, 32);
                glPolygonStipple(stipple_diag_stripes_pos);
                glRectf(x1, y1, x2, y2);

                /* dark stripes */
                glColor4ub(0, 0, 0, 32);
                glPolygonStipple(stipple_diag_stripes_neg);
                glRectf(x1, y1, x2, y2);

                glDisable(GL_POLYGON_STIPPLE);
                glDisable(GL_BLEND);
        }

        get_seq_color3ubv(scene, seq, col);
        if (G.moving && (seq->flag & SELECT)) {
                if(seq->flag & SEQ_OVERLAP) {
                        col[0]= 255; col[1]= col[2]= 40;
                }
                else
                        UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, 120+outline_tint);
        }
        else
                UI_GetColorPtrBlendShade3ubv(col, col, col, 0.0, outline_tint);
        
        glColor3ubv((GLubyte *)col);
        
        if (seq->flag & SEQ_MUTE) {
                glEnable(GL_LINE_STIPPLE);
                glLineStipple(1, 0x8888);
        }
        
        uiDrawBoxShade(GL_LINE_LOOP, x1, y1, x2, y2, 0.0, 0.1, 0.0);
        
        if (seq->flag & SEQ_MUTE) {
                glDisable(GL_LINE_STIPPLE);
        }
        
        if(seq->type==SEQ_META) drawmeta_contents(scene, seq, x1, y1, x2, y2);
        
        /* calculate if seq is long enough to print a name */
        x1= seq->startdisp+seq->handsize;
        x2= seq->enddisp-seq->handsize;

        /* info text on the strip */
        if(x1<v2d->cur.xmin) x1= v2d->cur.xmin;
        else if(x1>v2d->cur.xmax) x1= v2d->cur.xmax;
        if(x2<v2d->cur.xmin) x2= v2d->cur.xmin;
        else if(x2>v2d->cur.xmax) x2= v2d->cur.xmax;

        /* nice text here would require changing the view matrix for texture text */
        if( (x2-x1) / pixelx > 32) {
                draw_seq_text(v2d, seq, x1, x2, y1, y2, background_col);
        }
}

static Sequence *special_seq_update= 0;

static void set_special_seq_update(int val)
{
//      int x;

        /* if mouse over a sequence && LEFTMOUSE */
        if(val) {
// XXX          special_seq_update= find_nearest_seq(&x);
        }
        else special_seq_update= 0;
}

void draw_image_seq(const bContext* C, Scene *scene, ARegion *ar, SpaceSeq *sseq, int cfra, int frame_ofs)
{
        struct Main *bmain= CTX_data_main(C);
        struct ImBuf *ibuf = 0;
        struct ImBuf *scope = 0;
        struct View2D *v2d = &ar->v2d;
        int rectx, recty;
        float viewrectx, viewrecty;
        float render_size = 0.0;
        float proxy_size = 100.0;
        GLuint texid;
        GLuint last_texid;
        SeqRenderData context;

        render_size = sseq->render_size;
        if (render_size == 0) {
                render_size = scene->r.size;
        } else {
                proxy_size = render_size;
        }
        if (render_size < 0) {
                return;
        }

        viewrectx = (render_size*(float)scene->r.xsch)/100.0f;
        viewrecty = (render_size*(float)scene->r.ysch)/100.0f;

        rectx = viewrectx + 0.5f;
        recty = viewrecty + 0.5f;

        if (sseq->mainb == SEQ_DRAW_IMG_IMBUF) {
                viewrectx *= scene->r.xasp / scene->r.yasp;
                viewrectx /= proxy_size / 100.0f;
                viewrecty /= proxy_size / 100.0f;
        }

        if(frame_ofs == 0) {
                /* XXX TODO: take color from theme */
                glClearColor(0.0, 0.0, 0.0, 0.0);
                glClear(GL_COLOR_BUFFER_BIT);
        }

        /* without this colors can flicker from previous opengl state */
        glColor4ub(255, 255, 255, 255);

        UI_view2d_totRect_set(v2d, viewrectx + 0.5f, viewrecty + 0.5f);
        UI_view2d_curRect_validate(v2d);

        /* only initialize the preview if a render is in progress */
        if(G.rendering)
                return;

        context = seq_new_render_data(bmain, scene, rectx, recty, proxy_size);

        if (special_seq_update)
                ibuf= give_ibuf_seq_direct(context, cfra + frame_ofs, special_seq_update);
        else if (!U.prefetchframes) // XXX || (G.f & G_PLAYANIM) == 0) {
                ibuf= (ImBuf *)give_ibuf_seq(context, cfra + frame_ofs, sseq->chanshown);
        else
                ibuf= (ImBuf *)give_ibuf_seq_threaded(context, cfra + frame_ofs, sseq->chanshown);
        
        if(ibuf==NULL) 
                return;

        if(ibuf->rect==NULL && ibuf->rect_float == NULL) 
                return;
        
        switch(sseq->mainb) {
        case SEQ_DRAW_IMG_IMBUF:
                if (sseq->zebra != 0) {
                        scope = make_zebra_view_from_ibuf(ibuf, sseq->zebra);
                }
                break;
        case SEQ_DRAW_IMG_WAVEFORM:
                if ((sseq->flag & SEQ_DRAW_COLOR_SEPERATED) != 0) {
                        scope = make_sep_waveform_view_from_ibuf(ibuf);
                } else {
                        scope = make_waveform_view_from_ibuf(ibuf);
                }
                break;
        case SEQ_DRAW_IMG_VECTORSCOPE:
                scope = make_vectorscope_view_from_ibuf(ibuf);
                break;
        case SEQ_DRAW_IMG_HISTOGRAM:
                scope = make_histogram_view_from_ibuf(ibuf);
                break;
        }

        if (scope) {
                IMB_freeImBuf(ibuf);
                ibuf = scope;
        }

        if(ibuf->rect_float && ibuf->rect==NULL) {
                IMB_rect_from_float(ibuf);      
        }
        
        /* setting up the view - actual drawing starts here */
        UI_view2d_view_ortho(v2d);

        last_texid= glaGetOneInteger(GL_TEXTURE_2D);
        glEnable(GL_TEXTURE_2D);
        glGenTextures(1, (GLuint *)&texid);

        glBindTexture(GL_TEXTURE_2D, texid);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, ibuf->x, ibuf->y, 0, GL_RGBA, GL_UNSIGNED_BYTE, ibuf->rect);
        glBegin(GL_QUADS);

        if(frame_ofs) {
                rctf tot_clip;
                tot_clip.xmin= v2d->tot.xmin + (ABS(v2d->tot.xmax - v2d->tot.xmin) * scene->ed->over_border.xmin);
                tot_clip.ymin= v2d->tot.ymin + (ABS(v2d->tot.ymax - v2d->tot.ymin) * scene->ed->over_border.ymin);
                tot_clip.xmax= v2d->tot.xmin + (ABS(v2d->tot.xmax - v2d->tot.xmin) * scene->ed->over_border.xmax);
                tot_clip.ymax= v2d->tot.ymin + (ABS(v2d->tot.ymax - v2d->tot.ymin) * scene->ed->over_border.ymax);

                glTexCoord2f(scene->ed->over_border.xmin, scene->ed->over_border.ymin);glVertex2f(tot_clip.xmin, tot_clip.ymin);
                glTexCoord2f(scene->ed->over_border.xmin, scene->ed->over_border.ymax);glVertex2f(tot_clip.xmin, tot_clip.ymax);
                glTexCoord2f(scene->ed->over_border.xmax, scene->ed->over_border.ymax);glVertex2f(tot_clip.xmax, tot_clip.ymax);
                glTexCoord2f(scene->ed->over_border.xmax, scene->ed->over_border.ymin);glVertex2f(tot_clip.xmax, tot_clip.ymin);
        }
        else {
                glTexCoord2f(0.0f, 0.0f);glVertex2f(v2d->tot.xmin, v2d->tot.ymin);
                glTexCoord2f(0.0f, 1.0f);glVertex2f(v2d->tot.xmin, v2d->tot.ymax);
                glTexCoord2f(1.0f, 1.0f);glVertex2f(v2d->tot.xmax, v2d->tot.ymax);
                glTexCoord2f(1.0f, 0.0f);glVertex2f(v2d->tot.xmax, v2d->tot.ymin);
        }
        glEnd( );
        glBindTexture(GL_TEXTURE_2D, last_texid);
        glDisable(GL_TEXTURE_2D);
        glDeleteTextures(1, &texid);

        if(sseq->mainb == SEQ_DRAW_IMG_IMBUF) {

                float x1 = v2d->tot.xmin;
                float y1 = v2d->tot.ymin;
                float x2 = v2d->tot.xmax;
                float y2 = v2d->tot.ymax;

                /* border */
                setlinestyle(3);

                UI_ThemeColorBlendShade(TH_WIRE, TH_BACK, 1.0, 0);

                glBegin(GL_LINE_LOOP);
                glVertex2f(x1-0.5f, y1-0.5f);
                glVertex2f(x1-0.5f, y2+0.5f);
                glVertex2f(x2+0.5f, y2+0.5f);
                glVertex2f(x2+0.5f, y1-0.5f);
                glEnd();

                /* safety border */
                if ((sseq->flag & SEQ_DRAW_SAFE_MARGINS) != 0) {
                        float fac= 0.1;

                        float a= fac*(x2-x1);
                        x1+= a;
                        x2-= a;

                        a= fac*(y2-y1);
                        y1+= a;
                        y2-= a;

                        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

                        uiSetRoundBox(15);
                        uiDrawBox(GL_LINE_LOOP, x1, y1, x2, y2, 12.0);

                        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

                }

                setlinestyle(0);
        }
        
        /* draw grease-pencil (image aligned) */
//      if (sseq->flag & SEQ_DRAW_GPENCIL)
// XXX          draw_gpencil_2dimage(sa, ibuf);

        IMB_freeImBuf(ibuf);
        
        /* draw grease-pencil (screen aligned) */
//      if (sseq->flag & SEQ_DRAW_GPENCIL)
// XXX          draw_gpencil_view2d(sa, 0);
        
        /* ortho at pixel level */
        UI_view2d_view_restore(C);
}

#if 0
void drawprefetchseqspace(Scene *scene, ARegion *UNUSED(ar), SpaceSeq *sseq)
{
        int rectx, recty;
        int render_size = sseq->render_size;
        int proxy_size = 100.0; 
        if (render_size == 0) {
                render_size = scene->r.size;
        } else {
                proxy_size = render_size;
        }
        if (render_size < 0) {
                return;
        }

        rectx= (render_size*scene->r.xsch)/100;
        recty= (render_size*scene->r.ysch)/100;

        if(sseq->mainb != SEQ_DRAW_SEQUENCE) {
                give_ibuf_prefetch_request(
                        rectx, recty, (scene->r.cfra), sseq->chanshown,
                        proxy_size);
        }
}
#endif

/* draw backdrop of the sequencer strips view */
static void draw_seq_backdrop(View2D *v2d)
{
        int i;
        
        /* darker grey overlay over the view backdrop */
        UI_ThemeColorShade(TH_BACK, -20);
        glRectf(v2d->cur.xmin,  -1.0,  v2d->cur.xmax,  1.0);

        /* Alternating horizontal stripes */
        i= MAX2(1, ((int)v2d->cur.ymin)-1);

        glBegin(GL_QUADS);
                while (i<v2d->cur.ymax) {
                        if (((int)i) & 1)
                                UI_ThemeColorShade(TH_BACK, -15);
                        else
                                UI_ThemeColorShade(TH_BACK, -25);
                        
                        glVertex2f(v2d->cur.xmax, i);
                        glVertex2f(v2d->cur.xmin, i);
                        glVertex2f(v2d->cur.xmin, i+1);
                        glVertex2f(v2d->cur.xmax, i+1);
                        
                        i+=1.0;
                }
        glEnd();
        
        /* Darker lines separating the horizontal bands */
        i= MAX2(1, ((int)v2d->cur.ymin)-1);
        UI_ThemeColor(TH_GRID);
        
        glBegin(GL_LINES);
                while (i < v2d->cur.ymax) {
                        glVertex2f(v2d->cur.xmax, i);
                        glVertex2f(v2d->cur.xmin, i);
                        
                        i+=1.0;
                }
        glEnd();
}

/* draw the contents of the sequencer strips view */
static void draw_seq_strips(const bContext *C, Editing *ed, ARegion *ar)
{
        Scene *scene= CTX_data_scene(C);
        View2D *v2d= &ar->v2d;
        Sequence *last_seq = seq_active_get(scene);
        int sel = 0, j;
        float pixelx = (v2d->cur.xmax - v2d->cur.xmin)/(v2d->mask.xmax - v2d->mask.xmin);
        
        /* loop through twice, first unselected, then selected */
        for (j=0; j<2; j++) {
                Sequence *seq;
                int outline_tint= (j) ? -60 : -150; /* highlighting around strip edges indicating selection */
                
                /* loop through strips, checking for those that are visible */
                for (seq= ed->seqbasep->first; seq; seq= seq->next) {
                        /* boundbox and selection tests for NOT drawing the strip... */
                        if ((seq->flag & SELECT) != sel) continue;
                        else if (seq == last_seq) continue;
                        else if (MIN2(seq->startdisp, seq->start) > v2d->cur.xmax) continue;
                        else if (MAX2(seq->enddisp, seq->start+seq->len) < v2d->cur.xmin) continue;
                        else if (seq->machine+1.0f < v2d->cur.ymin) continue;
                        else if (seq->machine > v2d->cur.ymax) continue;
                        
                        /* strip passed all tests unscathed... so draw it now */
                        draw_seq_strip(scene, ar, seq, outline_tint, pixelx);
                }
                
                /* draw selected next time round */
                sel= SELECT; 
        }
        
        /* draw the last selected last (i.e. 'active' in other parts of Blender), removes some overlapping error */
        if (last_seq)
                draw_seq_strip(scene, ar, last_seq, 120, pixelx);
}

static void seq_draw_sfra_efra(Scene *scene, View2D *v2d)
{       
        glEnable(GL_BLEND);
        
        /* draw darkened area outside of active timeline 
         * frame range used is preview range or scene range */
        UI_ThemeColorShadeAlpha(TH_BACK, -25, -100);

        if (PSFRA < PEFRA) {
                glRectf(v2d->cur.xmin, v2d->cur.ymin, (float)PSFRA, v2d->cur.ymax);
                glRectf((float)PEFRA, v2d->cur.ymin, v2d->cur.xmax, v2d->cur.ymax);
        }
        else {
                glRectf(v2d->cur.xmin, v2d->cur.ymin, v2d->cur.xmax, v2d->cur.ymax);
        }

        UI_ThemeColorShade(TH_BACK, -60);
        /* thin lines where the actual frames are */
        fdrawline((float)PSFRA, v2d->cur.ymin, (float)PSFRA, v2d->cur.ymax);
        fdrawline((float)PEFRA, v2d->cur.ymin, (float)PEFRA, v2d->cur.ymax);
        
        glDisable(GL_BLEND);
}

/* Draw Timeline/Strip Editor Mode for Sequencer */
void draw_timeline_seq(const bContext *C, ARegion *ar)
{
        Scene *scene= CTX_data_scene(C);
        Editing *ed= seq_give_editing(scene, FALSE);
        SpaceSeq *sseq= CTX_wm_space_seq(C);
        View2D *v2d= &ar->v2d;
        View2DScrollers *scrollers;
        float col[3];
        int flag=0;
        
        /* clear and setup matrix */
        UI_GetThemeColor3fv(TH_BACK, col);
        if (ed && ed->metastack.first) 
                glClearColor(col[0], col[1], col[2]-0.1f, 0.0f);
        else 
                glClearColor(col[0], col[1], col[2], 0.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        UI_view2d_view_ortho(v2d);
        
        
        /* calculate extents of sequencer strips/data 
         * NOTE: needed for the scrollers later
         */
        boundbox_seq(scene, &v2d->tot);
        
        
        /* draw backdrop */
        draw_seq_backdrop(v2d);
        
        /* regular grid-pattern over the rest of the view (i.e. frame grid lines) */
        UI_view2d_constant_grid_draw(v2d);

        seq_draw_sfra_efra(scene, v2d); 

        /* sequence strips (if there is data available to be drawn) */
        if (ed) {
                /* draw the data */
                draw_seq_strips(C, ed, ar);
                
                /* text draw cached (for sequence names), in pixelspace now */
                UI_view2d_text_cache_draw(ar);
        }
        
        /* current frame */
        UI_view2d_view_ortho(v2d);
        if ((sseq->flag & SEQ_DRAWFRAMES)==0)   flag |= DRAWCFRA_UNIT_SECONDS;
        if ((sseq->flag & SEQ_NO_DRAW_CFRANUM)==0)  flag |= DRAWCFRA_SHOW_NUMBOX;
        ANIM_draw_cfra(C, v2d, flag);
        
        /* markers */
        UI_view2d_view_orthoSpecial(ar, v2d, 1);
        draw_markers_time(C, DRAW_MARKERS_LINES);
        
        /* preview range */
        UI_view2d_view_ortho(v2d);
        ANIM_draw_previewrange(C, v2d);

        /* overlap playhead */
        if(scene->ed && scene->ed->over_flag & SEQ_EDIT_OVERLAY_SHOW) {
                int cfra_over= (scene->ed->over_flag & SEQ_EDIT_OVERLAY_ABS) ? scene->ed->over_cfra : scene->r.cfra + scene->ed->over_ofs;
                glColor3f(0.2, 0.2, 0.2);
                // glRectf(cfra_over, v2d->cur.ymin, scene->ed->over_ofs + scene->r.cfra + 1, v2d->cur.ymax);

                glBegin(GL_LINES);
                        glVertex2f(cfra_over, v2d->cur.ymin);
                        glVertex2f(cfra_over, v2d->cur.ymax);
                glEnd();

        }
        
        /* reset view matrix */
        UI_view2d_view_restore(C);

        /* scrollers */
        scrollers= UI_view2d_scrollers_calc(C, v2d, V2D_UNIT_SECONDSSEQ, V2D_GRID_CLAMP, V2D_UNIT_VALUES, V2D_GRID_CLAMP);
        UI_view2d_scrollers_draw(C, v2d, scrollers);
        UI_view2d_scrollers_free(scrollers);
}