/*
 * Copyright 2007-2014, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT License.
 */


#include <create_display_modes.h>

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

#include <compute_display_timing.h>
#include <video_overlay.h>


#define POSITIVE_SYNC \
        (B_POSITIVE_HSYNC | B_POSITIVE_VSYNC)
#define MODE_FLAGS \
        (B_8_BIT_DAC | B_HARDWARE_CURSOR | B_PARALLEL_ACCESS | B_DPMS \
                | B_SUPPORTS_OVERLAYS | B_SCROLL)

// TODO: move this list into the app_server
static const display_mode kBaseModeList[] = {
        {{25175, 640, 656, 752, 800, 350, 387, 389, 449, B_POSITIVE_HSYNC}, B_CMAP8, 640, 350, 0, 0, MODE_FLAGS}, /* 640x350 - www.epanorama.net/documents/pc/vga_timing.html) */

        {{25175, 640, 656, 752, 800, 400, 412, 414, 449, B_POSITIVE_VSYNC}, B_CMAP8, 640, 400, 0, 0, MODE_FLAGS}, /* 640x400 - www.epanorama.net/documents/pc/vga_timing.html) */

        {{25175, 640, 656, 752, 800, 480, 490, 492, 525, 0}, B_CMAP8, 640, 480, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(640X480X8.Z1) */
        {{31500, 640, 664, 704, 832, 480, 489, 492, 520, 0}, B_CMAP8, 640, 480, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@70-72Hz_(640X480X8.Z1) */
        {{31500, 640, 656, 720, 840, 480, 481, 484, 500, 0}, B_CMAP8, 640, 480, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(640X480X8.Z1) */
        {{36000, 640, 696, 752, 832, 480, 481, 484, 509, 0}, B_CMAP8, 640, 480, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(640X480X8.Z1) */

        {{29580, 800, 816, 896, 992, 480, 481, 484, 497, B_POSITIVE_VSYNC}, B_CMAP8, 800, 480, 0, 0, MODE_FLAGS}, /* 800x480x60Hz */

        {{38100, 800, 832, 960, 1088, 600, 602, 606, 620, 0}, B_CMAP8, 800, 600, 0, 0, MODE_FLAGS}, /* SVGA_800X600X56HzNI */
        {{40000, 800, 840, 968, 1056, 600, 601, 605, 628, POSITIVE_SYNC}, B_CMAP8, 800, 600, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(800X600X8.Z1) */
        {{49500, 800, 816, 896, 1056, 600, 601, 604, 625, POSITIVE_SYNC}, B_CMAP8, 800, 600, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(800X600X8.Z1) */
        {{50000, 800, 856, 976, 1040, 600, 637, 643, 666, POSITIVE_SYNC}, B_CMAP8, 800, 600, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@70-72Hz_(800X600X8.Z1) */
        {{56250, 800, 832, 896, 1048, 600, 601, 604, 631, POSITIVE_SYNC}, B_CMAP8, 800, 600, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(800X600X8.Z1) */

        {{65000, 1024, 1048, 1184, 1344, 768, 771, 777, 806, 0}, B_CMAP8, 1024, 768, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1024X768X8.Z1) */
        {{75000, 1024, 1048, 1184, 1328, 768, 771, 777, 806, 0}, B_CMAP8, 1024, 768, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@70-72Hz_(1024X768X8.Z1) */
        {{78750, 1024, 1040, 1136, 1312, 768, 769, 772, 800, POSITIVE_SYNC}, B_CMAP8, 1024, 768, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(1024X768X8.Z1) */
        {{94500, 1024, 1072, 1168, 1376, 768, 769, 772, 808, POSITIVE_SYNC}, B_CMAP8, 1024, 768, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(1024X768X8.Z1) */

        {{81640, 1152, 1216, 1336, 1520, 864, 865, 868, 895, POSITIVE_SYNC}, B_CMAP8, 1152, 864, 0, 0, MODE_FLAGS}, /* 1152x864x60Hz */
        {{94200, 1152, 1184, 1280, 1472, 864, 865, 868, 914, POSITIVE_SYNC}, B_CMAP8, 1152, 864, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@70Hz_(1152X864X8.Z1) */
        {{108000, 1152, 1216, 1344, 1600, 864, 865, 868, 900, POSITIVE_SYNC}, B_CMAP8, 1152, 864, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(1152X864X8.Z1) */
        {{121500, 1152, 1216, 1344, 1568, 864, 865, 868, 911, POSITIVE_SYNC}, B_CMAP8, 1152, 864, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(1152X864X8.Z1) */

        {{74520, 1280, 1368, 1424, 1656, 720, 724, 730, 750, POSITIVE_SYNC}, B_CMAP8, 1280, 720, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1280X720) */

        {{83460, 1280, 1344, 1480, 1680, 800, 801, 804, 828, B_POSITIVE_VSYNC}, B_CMAP8, 1280, 800, 0, 0, MODE_FLAGS}, /* WXGA (1280x800x60) */

        {{108000, 1280, 1328, 1440, 1688, 1024, 1025, 1028, 1066, POSITIVE_SYNC}, B_CMAP8, 1280, 1024, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1280X1024X8.Z1) */
        {{135000, 1280, 1296, 1440, 1688, 1024, 1025, 1028, 1066, POSITIVE_SYNC}, B_CMAP8, 1280, 1024, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(1280X1024X8.Z1) */
        {{157500, 1280, 1344, 1504, 1728, 1024, 1025, 1028, 1072, POSITIVE_SYNC}, B_CMAP8, 1280, 1024, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(1280X1024X8.Z1) */

        {{85500, 1360, 1424, 1536, 1792, 768, 771, 778, 795, POSITIVE_SYNC}, B_CMAP8, 1360, 768, 0, 0, MODE_FLAGS}, /* 1360x768 60Hz */

        {{85765, 1366, 1494, 1624, 1798, 768, 770, 776, 795, POSITIVE_SYNC}, B_CMAP8, 1366, 768, 0, 0, MODE_FLAGS}, /* 1366x768 60Hz */

        {{122600, 1400, 1488, 1640, 1880, 1050, 1051, 1054, 1087, POSITIVE_SYNC}, B_CMAP8, 1400, 1050, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1400X1050) */
        {{155800, 1400, 1464, 1784, 1912, 1050, 1052, 1064, 1090, POSITIVE_SYNC}, B_CMAP8, 1400, 1050, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(1400X1050) */

        {{106500, 1440, 1520, 1672, 1904, 900, 901, 904, 932, POSITIVE_SYNC}, B_CMAP8, 1440, 900, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1440X900) */

        {{120420, 1600, 1632, 2088, 2120, 900, 918, 927, 946, POSITIVE_SYNC}, B_CMAP8, 1600, 900, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1600X900) */

        {{162000, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1600X1200X8.Z1) */
        {{175500, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@65Hz_(1600X1200X8.Z1) */
        {{189000, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@70Hz_(1600X1200X8.Z1) */
        {{202500, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@75Hz_(1600X1200X8.Z1) */
        {{216000, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@80Hz_(1600X1200X8.Z1) */
        {{229500, 1600, 1664, 1856, 2160, 1200, 1201, 1204, 1250, POSITIVE_SYNC}, B_CMAP8, 1600, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@85Hz_(1600X1200X8.Z1) */

        {{147100, 1680, 1784, 1968, 2256, 1050, 1051, 1054, 1087, POSITIVE_SYNC}, B_CMAP8, 1680, 1050, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1680X1050) */

        //{{172000, 1920, 2040, 2248, 2576, 1080, 1081, 1084, 1118, POSITIVE_SYNC}, B_CMAP8, 1920, 1080, 0, 0, MODE_FLAGS}, /* 1920x1080 60Hz */
        {{148500, 1920, 2008, 2052, 2200, 1080, 1084, 1089, 1125, POSITIVE_SYNC}, B_CMAP8, 1920, 1080, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1920X1080) */
        //{{160000, 1920, 2010, 2060, 2110, 1200, 1202, 1208, 1235, POSITIVE_SYNC}, B_CMAP8, 1920, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1920X1200) */
        {{193160, 1920, 2048, 2256, 2592, 1200, 1201, 1204, 1242, POSITIVE_SYNC}, B_CMAP8, 1920, 1200, 0, 0, MODE_FLAGS}, /* Vesa_Monitor_@60Hz_(1920X1200) */
};
static const uint32 kNumBaseModes = sizeof(kBaseModeList) / sizeof(display_mode);


namespace BPrivate {

class ModeList {
public:
                                                                ModeList();
                                                                ~ModeList();

                        bool                            AddModes(edid1_info* info);
                        bool                            AddModes(const display_mode* modes,
                                                                        uint32 count);

                        bool                            CreateColorSpaces(const color_space* spaces,
                                                                        uint32 count);
                        void                            Filter(check_display_mode_hook hook);
                        void                            Clean();

                        const display_mode*     Modes() const { return fModes; }
                        uint32                          Count() const { return fCount; }

private:
                        bool                            _MakeSpace(uint32 count);
                        bool                            _AddMode(const display_mode& mode);
                        void                            _RemoveModeAt(uint32 index);
                        void                            _AddBaseMode(uint16 width, uint16 height,
                                                                        uint32 refresh);
                        display_mode*           _FindMode(uint16 width, uint16 height) const;

private:
                        display_mode*           fModes;
                        uint32                          fCount;
                        uint32                          fCapacity;
};

}       // namespace BPrivate

using namespace BPrivate;


static float
get_refresh_rate(const display_mode& mode)
{
        return float(mode.timing.pixel_clock * 1000)
                / float(mode.timing.h_total * mode.timing.v_total);
}


static int
compare_mode(const void* _mode1, const void* _mode2)
{
        display_mode *mode1 = (display_mode *)_mode1;
        display_mode *mode2 = (display_mode *)_mode2;
        uint16 width1, width2, height1, height2;

        width1 = mode1->virtual_width;
        height1 = mode1->virtual_height;
        width2 = mode2->virtual_width;
        height2 = mode2->virtual_height;

        if (width1 != width2)
                return width1 - width2;

        if (height1 != height2)
                return height1 - height2;

        if (mode1->space != mode2->space)
                return mode1->space - mode2->space;

        return (int)(100 * (get_refresh_rate(*mode1) - get_refresh_rate(*mode2)));
}


//      #pragma mark -


ModeList::ModeList()
        :
        fModes(NULL),
        fCount(0),
        fCapacity(0)
{
}


ModeList::~ModeList()
{
        free(fModes);
}


bool
ModeList::AddModes(edid1_info* info)
{
        if (info->established_timing.res_720x400x70)
                _AddBaseMode(720, 400, 70);
        if (info->established_timing.res_720x400x88)
                _AddBaseMode(720, 400, 88);

        if (info->established_timing.res_640x480x60)
                _AddBaseMode(640, 480, 60);
        if (info->established_timing.res_640x480x67)
                _AddBaseMode(640, 480, 67);
        if (info->established_timing.res_640x480x72)
                _AddBaseMode(640, 480, 72);
        if (info->established_timing.res_640x480x75)
                _AddBaseMode(640, 480, 75);

        if (info->established_timing.res_800x600x56)
                _AddBaseMode(800, 600, 56);
        if (info->established_timing.res_800x600x60)
                _AddBaseMode(800, 600, 60);
        if (info->established_timing.res_800x600x72)
                _AddBaseMode(800, 600, 72);
        if (info->established_timing.res_800x600x75)
                _AddBaseMode(800, 600, 75);

#if 0
        if (info->established_timing.res_832x624x75)
                _AddBaseMode(832, 624, 75);

        if (info->established_timing.res_1024x768x87i)
                _AddBaseMode(1024, 768, 87);
#endif
        if (info->established_timing.res_1024x768x60)
                _AddBaseMode(1024, 768, 60);
        if (info->established_timing.res_1024x768x70)
                _AddBaseMode(1024, 768, 70);
        if (info->established_timing.res_1024x768x75)
                _AddBaseMode(1024, 768, 75);

        if (info->established_timing.res_1152x870x75)
                _AddBaseMode(1152, 870, 75);
        if (info->established_timing.res_1280x1024x75)
                _AddBaseMode(1280, 1024, 75);

        for (uint32 i = 0; i < EDID1_NUM_STD_TIMING; ++i) {
                if (info->std_timing[i].h_size <= 256)
                        continue;

                _AddBaseMode(info->std_timing[i].h_size, info->std_timing[i].v_size,
                        info->std_timing[i].refresh);
        }

        bool hasRanges = false;
        uint32 minHorizontalFrequency = 0;
        uint32 maxHorizontalFrequency = 0;
        uint32 minVerticalFrequency = 0;
        uint32 maxVerticalFrequency = 0;
        uint32 maxPixelClock = 0;

        for (uint32 i = 0; i < EDID1_NUM_DETAILED_MONITOR_DESC; ++i) {
                if (info->detailed_monitor[i].monitor_desc_type
                                == EDID1_MONITOR_RANGES) {
                        edid1_monitor_range& range
                                = info->detailed_monitor[i].data.monitor_range;

                        hasRanges = true;
                        minHorizontalFrequency = range.min_h;
                        maxHorizontalFrequency = range.max_h;
                        minVerticalFrequency = range.min_v;
                        maxVerticalFrequency = range.max_v;
                        maxPixelClock = range.max_clock * 10000;
                        continue;
                } else if (info->detailed_monitor[i].monitor_desc_type
                                != EDID1_IS_DETAILED_TIMING)
                        continue;

                // TODO: handle flags correctly!
                const edid1_detailed_timing& timing
                        = info->detailed_monitor[i].data.detailed_timing;
                display_mode mode;

                if (timing.pixel_clock <= 0/* || timing.sync != 3*/)
                        continue;

                mode.timing.pixel_clock = timing.pixel_clock * 10;
                mode.timing.h_display = timing.h_active;
                mode.timing.h_sync_start = timing.h_active + timing.h_sync_off;
                mode.timing.h_sync_end = mode.timing.h_sync_start + timing.h_sync_width;
                mode.timing.h_total = timing.h_active + timing.h_blank;
                mode.timing.v_display = timing.v_active;
                mode.timing.v_sync_start = timing.v_active + timing.v_sync_off;
                mode.timing.v_sync_end = mode.timing.v_sync_start + timing.v_sync_width;
                mode.timing.v_total = timing.v_active + timing.v_blank;
                mode.timing.flags = 0;
                if (timing.sync == 3) {
                        if (timing.misc & 1)
                                mode.timing.flags |= B_POSITIVE_HSYNC;
                        if (timing.misc & 2)
                                mode.timing.flags |= B_POSITIVE_VSYNC;
                }
                if (timing.interlaced)
                        mode.timing.flags |= B_TIMING_INTERLACED;
                mode.space = B_RGB32;
                mode.virtual_width = timing.h_active;
                mode.virtual_height = timing.v_active;
                mode.h_display_start = 0;
                mode.v_display_start = 0;
                mode.flags = MODE_FLAGS;

                _AddMode(mode);
        }

        // Add other modes from the base list that satisfy the display's
        // requirements

        for (uint32 i = 0; i < kNumBaseModes; i++) {
                const display_mode& mode = kBaseModeList[i];

                // Check if a mode with this resolution already exists

                if (_FindMode(mode.timing.h_display, mode.timing.v_display) != NULL)
                        continue;

                // Check monitor limits

                if (hasRanges) {
                        uint32 verticalFrequency = 1000 * mode.timing.pixel_clock
                                / (mode.timing.h_total * mode.timing.v_total);
                        uint32 horizontalFrequency = mode.timing.h_total * verticalFrequency
                                / 1000;

                        if (minHorizontalFrequency > horizontalFrequency
                                || maxHorizontalFrequency < horizontalFrequency
                                || minVerticalFrequency > verticalFrequency
                                || maxVerticalFrequency < verticalFrequency
                                || maxPixelClock < mode.timing.pixel_clock)
                                continue;
                }

                _AddMode(mode);
        }

        return true;
}


bool
ModeList::AddModes(const display_mode* modes, uint32 count)
{
        if (!_MakeSpace(count))
                return false;

        for (uint32 i = 0; i < count; i++) {
                fModes[fCount++] = modes[i];
        }

        return true;
}


bool
ModeList::CreateColorSpaces(const color_space* spaces, uint32 count)
{
        uint32 baseModeCount = fCount;
        size_t baseModesSize = baseModeCount * sizeof(display_mode);
        display_mode* baseModes = (display_mode*)malloc(baseModesSize);
        if (baseModes == NULL)
                return false;

        memcpy(baseModes, fModes, baseModesSize);

        for (uint32 i = 0; i < count; i++) {
                if (i > 0 && !AddModes(baseModes, baseModeCount)) {
                        free(baseModes);
                        return false;
                }

                for (uint32 j = 0; j < baseModeCount; j++) {
                        fModes[j + fCount - baseModeCount].space = spaces[i];
                }
        }

        free(baseModes);
        return true;
}


void
ModeList::Filter(check_display_mode_hook hook)
{
        if (hook == NULL)
                return;

        for (uint32 i = fCount; i-- > 0;) {
                if (!hook(&fModes[i]))
                        _RemoveModeAt(i);
        }
}


void
ModeList::Clean()
{
        // sort mode list
        qsort(fModes, fCount, sizeof(display_mode), compare_mode);

        // remove duplicates
        for (uint32 i = fCount; i-- > 1;) {
                if (compare_mode(&fModes[i], &fModes[i - 1]) == 0)
                        _RemoveModeAt(i);
        }
}


void
ModeList::_AddBaseMode(uint16 width, uint16 height, uint32 refresh)
{
        // Check the manually tweaked list first

        for (uint32 i = 0; i < kNumBaseModes; i++) {
                const display_mode& mode = kBaseModeList[i];

                // Add mode if width and height match, and the computed refresh rate of
                // the mode is within 1.2 percent of the refresh rate specified by the
                // caller.  Note that refresh rates computed from mode parameters is
                // not exact;  thus, the tolerance of 1.2% was obtained by testing the
                // various established modes that can be selected by the EDID info.

                if (mode.timing.h_display == width && mode.timing.v_display == height
                        && fabs(get_refresh_rate(mode) - refresh) < refresh * 0.012) {
                        _AddMode(mode);
                        return;
                }
        }

        // If that didn't have any entries, compute the entry
        display_mode mode;
        if (compute_display_timing(width, height, refresh, false, &mode.timing)
                        != B_OK)
                return;

        fill_display_mode(width, height, &mode);

        _AddMode(mode);
}


display_mode*
ModeList::_FindMode(uint16 width, uint16 height) const
{
        for (uint32 i = 0; i < fCount; i++) {
                const display_mode& mode = fModes[i];

                if (mode.timing.h_display == width && mode.timing.v_display == height)
                        return &fModes[i];
        }

        return NULL;
}


bool
ModeList::_MakeSpace(uint32 count)
{
        if (fCount + count <= fCapacity)
                return true;

        uint32 capacity = (fCapacity + count + 0xf) & ~0xf;
        display_mode* modes = (display_mode*)realloc(fModes,
                capacity * sizeof(display_mode));
        if (modes == NULL)
                return false;

        fModes = modes;
        fCapacity = capacity;
        return true;
}


bool
ModeList::_AddMode(const display_mode& mode)
{
        // TODO: filter by monitor timing constraints!
        // TODO: remove double entries
        if (!_MakeSpace(1))
                return false;

        fModes[fCount++] = mode;
        return true;
}


void
ModeList::_RemoveModeAt(uint32 index)
{
        if (index < fCount - 1) {
                memmove(&fModes[index], &fModes[index + 1],
                        (fCount - 1 - index) * sizeof(display_mode));
        }

        fCount--;
}


//      #pragma mark -


extern "C" area_id
create_display_modes(const char* name, edid1_info* edid,
        const display_mode* initialModes, uint32 initialModeCount,
        const color_space *spaces, uint32 spacesCount,
        check_display_mode_hook hook, display_mode** _modes, uint32* _count)
{
        if (_modes == NULL || _count == NULL)
                return B_BAD_VALUE;

        // compile initial mode list from the different sources

        ModeList modes;
        if (initialModes != NULL)
                modes.AddModes(initialModes, initialModeCount);

        if (edid != NULL)
                modes.AddModes(edid);
        else
                modes.AddModes(kBaseModeList, kNumBaseModes);

        // filter out modes the caller doesn't like, and multiply modes for
        // every color space

        if (spaces == NULL) {
                const color_space kDefaultSpaces[] = {B_RGB32_LITTLE, B_RGB16_LITTLE,
                        B_RGB15_LITTLE, B_CMAP8};
                modes.CreateColorSpaces(kDefaultSpaces,
                        sizeof(kDefaultSpaces) / sizeof(kDefaultSpaces[0]));
        } else
                modes.CreateColorSpaces(spaces, spacesCount);

        modes.Filter(hook);
        modes.Clean();

        // create area for output modes

        size_t size = (sizeof(display_mode) * modes.Count() + B_PAGE_SIZE - 1)
                & ~(B_PAGE_SIZE - 1);
        display_mode *list;
        area_id area = create_area(name, (void **)&list, B_ANY_ADDRESS,
                size, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA | B_CLONEABLE_AREA);
        if (area < B_OK)
                return area;

        memcpy(list, modes.Modes(), sizeof(display_mode) * modes.Count());
        *_modes = list;
        *_count = modes.Count();

        return area;
}


void
fill_display_mode(uint32 width, uint32 height, display_mode* mode)
{
        mode->space = B_CMAP8;
        mode->virtual_width = width;
        mode->virtual_height = height;
        mode->h_display_start = 0;
        mode->v_display_start = 0;
        mode->flags = MODE_FLAGS;
}