#include "global.h"
#include "gflib.h"
#include "util.h"
#include "decompress.h"
#include "task.h"

enum
{
    NORMAL_FADE,
    FAST_FADE,
    HARDWARE_FADE,
};

#define NUM_PALETTE_STRUCTS 16

// unused palette struct
struct PaletteStructTemplate
{
    u16 uid;
    u16 *src;
    u16 pst_field_8_0:1;
    u16 pst_field_8_1:9;
    u16 size:5;
    u16 pst_field_9_7:1;
    u8 pst_field_A;
    u8 srcCount:5;
    u8 pst_field_B_5:3;
    u8 pst_field_C;
};

struct PaletteStruct
{
    const struct PaletteStructTemplate *base;
    u32 ps_field_4_0:1;
    u16 ps_field_4_1:1;
    u32 baseDestOffset:9;
    u16 destOffset:10;
    u16 srcIndex:7;
    u8 ps_field_8;
    u8 ps_field_9;
};

static void sub_8070790(struct PaletteStruct *, u32 *);
static void sub_80708F4(struct PaletteStruct *, u32 *);
static void sub_80709B4(struct PaletteStruct *);
static u8 GetPaletteNumByUid(u16);
static u8 UpdateNormalPaletteFade(void);
static void BeginFastPaletteFadeInternal(u8);
static u8 UpdateFastPaletteFade(void);
static u8 UpdateHardwarePaletteFade(void);
static void UpdateBlendRegisters(void);
static bool8 IsSoftwarePaletteFadeFinishing(void);
static void sub_80718B8(u8 taskId);

ALIGNED(4) EWRAM_DATA u16 gPlttBufferUnfaded[PLTT_BUFFER_SIZE] = {0};
ALIGNED(4) EWRAM_DATA u16 gPlttBufferFaded[PLTT_BUFFER_SIZE] = {0};
static EWRAM_DATA struct PaletteStruct sPaletteStructs[NUM_PALETTE_STRUCTS] = {0};
EWRAM_DATA struct PaletteFadeControl gPaletteFade = {0};
static EWRAM_DATA u32 sPlttBufferTransferPending = 0;
EWRAM_DATA u8 gPaletteDecompressionBuffer[PLTT_DECOMP_BUFFER_SIZE] = {0};

static const struct PaletteStructTemplate gDummyPaletteStructTemplate =
{
    .uid = 0xFFFF,
    .pst_field_B_5 = 1
};

static const u8 sRoundedDownGrayscaleMap[] =
{
     0,  0,  0,  0,  0,
     5,  5,  5,  5,  5,
    11, 11, 11, 11, 11,
    16, 16, 16, 16, 16,
    21, 21, 21, 21, 21,
    27, 27, 27, 27, 27,
    31, 31
};

void LoadCompressedPalette(const u32 *src, u16 offset, u16 size)
{
    LZDecompressWram(src, gPaletteDecompressionBuffer);
    CpuCopy16(gPaletteDecompressionBuffer, gPlttBufferUnfaded + offset, size);
    CpuCopy16(gPaletteDecompressionBuffer, gPlttBufferFaded + offset, size);
}

void LoadPalette(const void *src, u16 offset, u16 size)
{
    CpuCopy16(src, gPlttBufferUnfaded + offset, size);
    CpuCopy16(src, gPlttBufferFaded + offset, size);
}

void FillPalette(u16 value, u16 offset, u16 size)
{
    CpuFill16(value, gPlttBufferUnfaded + offset, size);
    CpuFill16(value, gPlttBufferFaded + offset, size);
}

void TransferPlttBuffer(void)
{
    if (!gPaletteFade.bufferTransferDisabled)
    {
        void *src = gPlttBufferFaded;
        void *dest = (void *)PLTT;
        DmaCopy16(3, src, dest, PLTT_SIZE);
        sPlttBufferTransferPending = 0;
        if (gPaletteFade.mode == HARDWARE_FADE && gPaletteFade.active)
            UpdateBlendRegisters();
    }
}

u8 UpdatePaletteFade(void)
{
    u8 result;
    u8 dummy = 0;

    if (sPlttBufferTransferPending)
        return PALETTE_FADE_STATUS_LOADING;
    if (gPaletteFade.mode == NORMAL_FADE)
        result = UpdateNormalPaletteFade();
    else if (gPaletteFade.mode == FAST_FADE)
        result = UpdateFastPaletteFade();
    else
        result = UpdateHardwarePaletteFade();
    sPlttBufferTransferPending = gPaletteFade.multipurpose1 | dummy;
    return result;
}

void ResetPaletteFade(void)
{
    u8 i;

    for (i = 0; i < 16; ++i)
        ResetPaletteStruct(i);
    ResetPaletteFadeControl();
}

void ReadPlttIntoBuffers(void)
{
    u16 i;
    u16 *pltt = (u16 *)PLTT;

    for (i = 0; i < PLTT_SIZE / 2; ++i)
    {
        gPlttBufferUnfaded[i] = pltt[i];
        gPlttBufferFaded[i] = pltt[i];
    }
}

bool8 BeginNormalPaletteFade(u32 selectedPalettes, s8 delay, u8 startY, u8 targetY, u16 blendColor)
{
    u8 temp;
    u16 color = blendColor;

    if (gPaletteFade.active)
    {
        return FALSE;
    }
    else
    {
        gPaletteFade.deltaY = 2;
        if (delay < 0)
        {
            gPaletteFade.deltaY += (delay * -1);
            delay = 0;
        }
        gPaletteFade_selectedPalettes = selectedPalettes;
        gPaletteFade.delayCounter = delay;
        gPaletteFade_delay = delay;
        gPaletteFade.y = startY;
        gPaletteFade.targetY = targetY;
        gPaletteFade.blendColor = color;
        gPaletteFade.active = TRUE;
        gPaletteFade.mode = NORMAL_FADE;
        if (startY < targetY)
            gPaletteFade.yDec = FALSE;
        else
            gPaletteFade.yDec = TRUE;
        UpdatePaletteFade();
        temp = gPaletteFade.bufferTransferDisabled;
        gPaletteFade.bufferTransferDisabled = FALSE;
        CpuCopy32(gPlttBufferFaded, (void *)PLTT, PLTT_SIZE);
        sPlttBufferTransferPending = 0;
        if (gPaletteFade.mode == HARDWARE_FADE && gPaletteFade.active)
            UpdateBlendRegisters();
        gPaletteFade.bufferTransferDisabled = temp;
        return TRUE;
    }
}

// not used
static bool8 sub_80706D0(u32 a1, u8 a2, u8 a3, u8 a4, u16 a5)
{
    ReadPlttIntoBuffers();
    return BeginNormalPaletteFade(a1, a2, a3, a4, a5);
}

// not used
static void sub_8070718(u8 a1, u32 *a2)
{
    u8 i;

    for (i = 0; i < NUM_PALETTE_STRUCTS; ++i)
    {
        struct PaletteStruct *palstruct = &sPaletteStructs[i];

        if (palstruct->ps_field_4_0)
        {
            if (palstruct->base->pst_field_8_0 == a1)
            {
                u8 val1 = palstruct->srcIndex;
                u8 val2 = palstruct->base->srcCount;

                if (val1 == val2)
                {
                    sub_80709B4(palstruct);
                    if (!palstruct->ps_field_4_0)
                        continue;
                }
                if (palstruct->ps_field_8 == 0)
                    sub_8070790(palstruct, a2);
                else
                    --palstruct->ps_field_8;
                sub_80708F4(palstruct, a2);
            }
        }
    }
}

// not used
static void sub_8070790(struct PaletteStruct *a1, u32 *a2)
{
    s32 srcIndex;
    s32 srcCount;
    u8 i = 0;
    u16 srcOffset = a1->srcIndex * a1->base->size;

    if (!a1->base->pst_field_8_0)
    {
        while (i < a1->base->size)
        {
            gPlttBufferUnfaded[a1->destOffset] = a1->base->src[srcOffset];
            gPlttBufferFaded[a1->destOffset] = a1->base->src[srcOffset];
            ++i;
            ++a1->destOffset;
            ++srcOffset;
        }
    }
    else
    {
        while (i < a1->base->size)
        {
            gPlttBufferFaded[a1->destOffset] = a1->base->src[srcOffset];
            ++i;
            ++a1->destOffset;
            ++srcOffset;
        }
    }
    a1->destOffset = a1->baseDestOffset;
    a1->ps_field_8 = a1->base->pst_field_A;
    ++a1->srcIndex;
    srcIndex = a1->srcIndex;
    srcCount = a1->base->srcCount;
    if (srcIndex >= srcCount)
    {
        if (a1->ps_field_9)
            --a1->ps_field_9;
        a1->srcIndex = 0;
    }
    *a2 |= 1 << (a1->baseDestOffset >> 4);
}

// not used
static void sub_80708F4(struct PaletteStruct *a1, u32 *a2)
{
    if (gPaletteFade.active && ((1 << (a1->baseDestOffset >> 4)) & gPaletteFade_selectedPalettes))
    {
        if (!a1->base->pst_field_8_0)
        {
            if (gPaletteFade.delayCounter != gPaletteFade_delay)
                BlendPalette(a1->baseDestOffset,
                             a1->base->size,
                             gPaletteFade.y,
                             gPaletteFade.blendColor);
        }
        else
        {
            if (!gPaletteFade.delayCounter)
            {
                if (a1->ps_field_8 != a1->base->pst_field_A)
                {
                    u32 srcOffset = a1->srcIndex * a1->base->size;
                    u8 i;

                    for (i = 0; i < a1->base->size; ++i)
                        gPlttBufferFaded[a1->baseDestOffset + i] = a1->base->src[srcOffset + i];
                }
            }
        }
    }
}

// not used
static void sub_80709B4(struct PaletteStruct *a1)
{
    if (!a1->ps_field_9)
    {
        s32 val = a1->base->pst_field_B_5;

        if (!val)
        {
            a1->srcIndex = 0;
            a1->ps_field_8 = a1->base->pst_field_A;
            a1->ps_field_9 = a1->base->pst_field_C;
            a1->destOffset = a1->baseDestOffset;
        }
        else
        {
            if (val < 0)
                return;
            if (val > 2)
                return;
            ResetPaletteStructByUid(a1->base->uid);
        }
    }
    else
    {
        --a1->ps_field_9;
    }
}

void ResetPaletteStructByUid(u16 a1)
{
    u8 paletteNum = GetPaletteNumByUid(a1);
    if (paletteNum != 16)
        ResetPaletteStruct(paletteNum);
}

void ResetPaletteStruct(u8 paletteNum)
{
    sPaletteStructs[paletteNum].base = &gDummyPaletteStructTemplate;
    sPaletteStructs[paletteNum].ps_field_4_0 = 0;
    sPaletteStructs[paletteNum].baseDestOffset = 0;
    sPaletteStructs[paletteNum].destOffset = 0;
    sPaletteStructs[paletteNum].srcIndex = 0;
    sPaletteStructs[paletteNum].ps_field_4_1 = 0;
    sPaletteStructs[paletteNum].ps_field_8 = 0;
    sPaletteStructs[paletteNum].ps_field_9 = 0;
}

void ResetPaletteFadeControl(void)
{
    gPaletteFade.multipurpose1 = 0;
    gPaletteFade.multipurpose2 = 0;
    gPaletteFade.delayCounter = 0;
    gPaletteFade.y = 0;
    gPaletteFade.targetY = 0;
    gPaletteFade.blendColor = 0;
    gPaletteFade.active = FALSE;
    gPaletteFade.multipurpose2 = 0; // assign same value twice
    gPaletteFade.yDec = FALSE;
    gPaletteFade.bufferTransferDisabled = FALSE;
    gPaletteFade.shouldResetBlendRegisters = FALSE;
    gPaletteFade.hardwareFadeFinishing = FALSE;
    gPaletteFade.softwareFadeFinishing = FALSE;
    gPaletteFade.softwareFadeFinishingCounter = 0;
    gPaletteFade.objPaletteToggle = 0;
    gPaletteFade.deltaY = 2;
}

// not used
static void sub_8070AFC(u16 uid)
{
    u8 paletteNum = GetPaletteNumByUid(uid);
    if (paletteNum != 16)
        sPaletteStructs[paletteNum].ps_field_4_1 = 1;
}

// not used
static void sub_8070B28(u16 uid)
{
    u8 paletteNum = GetPaletteNumByUid(uid);
    if (paletteNum != 16)
        sPaletteStructs[paletteNum].ps_field_4_1 = 0;
}

// not used
static u8 GetPaletteNumByUid(u16 uid)
{
    u8 i;

    for (i = 0; i < NUM_PALETTE_STRUCTS; ++i)
        if (sPaletteStructs[i].base->uid == uid)
            return i;
    return 16;
}

static u8 UpdateNormalPaletteFade(void)
{
    u16 paletteOffset;
    u16 selectedPalettes;

    if (!gPaletteFade.active)
        return PALETTE_FADE_STATUS_DONE;
    if (IsSoftwarePaletteFadeFinishing())
    {
        return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
    }
    else
    {
        if (!gPaletteFade.objPaletteToggle)
        {
            if (gPaletteFade.delayCounter < gPaletteFade_delay)
            {
                ++gPaletteFade.delayCounter;
                return 2;
            }
            gPaletteFade.delayCounter = 0;
        }
        paletteOffset = 0;
        if (!gPaletteFade.objPaletteToggle)
        {
            selectedPalettes = gPaletteFade_selectedPalettes;
        }
        else
        {
            selectedPalettes = gPaletteFade_selectedPalettes >> 16;
            paletteOffset = 256;
        }
        while (selectedPalettes)
        {
            if (selectedPalettes & 1)
                BlendPalette(paletteOffset,
                             16,
                             gPaletteFade.y,
                             gPaletteFade.blendColor);
            selectedPalettes >>= 1;
            paletteOffset += 16;
        }
        gPaletteFade.objPaletteToggle ^= 1;
        if (!gPaletteFade.objPaletteToggle)
        {
            if (gPaletteFade.y == gPaletteFade.targetY)
            {
                gPaletteFade_selectedPalettes = 0;
                gPaletteFade.softwareFadeFinishing = TRUE;
            }
            else
            {
                s8 val;

                if (!gPaletteFade.yDec)
                {
                    val = gPaletteFade.y;
                    val += gPaletteFade.deltaY;
                    if (val > gPaletteFade.targetY)
                        val = gPaletteFade.targetY;
                    gPaletteFade.y = val;
                }
                else
                {
                    val = gPaletteFade.y;
                    val -= gPaletteFade.deltaY;
                    if (val < gPaletteFade.targetY)
                        val = gPaletteFade.targetY;
                    gPaletteFade.y = val;
                }
            }
        }
        // gPaletteFade.active cannot change since the last time it was checked. So this
        // is equivalent to `return PALETTE_FADE_STATUS_ACTIVE;`
        return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
    }
}

void InvertPlttBuffer(u32 selectedPalettes)
{
    u16 paletteOffset = 0;

    while (selectedPalettes)
    {
        if (selectedPalettes & 1)
        {
            u8 i;

            for (i = 0; i < 16; ++i)
                gPlttBufferFaded[paletteOffset + i] = ~gPlttBufferFaded[paletteOffset + i];
        }
        selectedPalettes >>= 1;
        paletteOffset += 16;
    }
}

void TintPlttBuffer(u32 selectedPalettes, s8 r, s8 g, s8 b)
{
    u16 paletteOffset = 0;

    while (selectedPalettes)
    {
        if (selectedPalettes & 1)
        {
            u8 i;

            for (i = 0; i < 16; ++i)
            {
                struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[paletteOffset + i];
                
                data->r += r;
                data->g += g;
                data->b += b;
            }
        }
        selectedPalettes >>= 1;
        paletteOffset += 16;
    }
}

void UnfadePlttBuffer(u32 selectedPalettes)
{
    u16 paletteOffset = 0;

    while (selectedPalettes)
    {
        if (selectedPalettes & 1)
        {
            u8 i;

            for (i = 0; i < 16; ++i)
                gPlttBufferFaded[paletteOffset + i] = gPlttBufferUnfaded[paletteOffset + i];
        }
        selectedPalettes >>= 1;
        paletteOffset += 16;
    }
}

void BeginFastPaletteFade(u8 submode)
{
    gPaletteFade.deltaY = 2;
    BeginFastPaletteFadeInternal(submode);
}

static void BeginFastPaletteFadeInternal(u8 submode)
{
    gPaletteFade.y = 31;
    gPaletteFade_submode = submode & 0x3F;
    gPaletteFade.active = TRUE;
    gPaletteFade.mode = FAST_FADE;
    if (submode == FAST_FADE_IN_FROM_BLACK)
        CpuFill16(RGB_BLACK, gPlttBufferFaded, PLTT_SIZE);
    if (submode == FAST_FADE_IN_FROM_WHITE)
        CpuFill16(RGB_WHITE, gPlttBufferFaded, PLTT_SIZE);
    UpdatePaletteFade();
}

static u8 UpdateFastPaletteFade(void)
{
    u16 i;
    u16 paletteOffsetStart, paletteOffsetEnd;
    s8 r0, g0, b0, r, g, b;

    if (!gPaletteFade.active)
        return PALETTE_FADE_STATUS_DONE;
    if (IsSoftwarePaletteFadeFinishing())
        return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
    if (gPaletteFade.objPaletteToggle)
    {
        paletteOffsetStart = 256;
        paletteOffsetEnd = 512;
    }
    else
    {
        paletteOffsetStart = 0;
        paletteOffsetEnd = 256;
    }
    switch (gPaletteFade_submode)
    {
    case FAST_FADE_IN_FROM_WHITE:
        for (i = paletteOffsetStart; i < paletteOffsetEnd; ++i)
        {
            struct PlttData *unfaded;
            struct PlttData *faded;

            unfaded = (struct PlttData *)&gPlttBufferUnfaded[i];
            r0 = unfaded->r;
            g0 = unfaded->g;
            b0 = unfaded->b;
            faded = (struct PlttData *)&gPlttBufferFaded[i];
            r = faded->r - 2;
            g = faded->g - 2;
            b = faded->b - 2;
            if (r < r0)
                r = r0;
            if (g < g0)
                g = g0;
            if (b < b0)
                b = b0;
            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
        }
        break;
    case FAST_FADE_OUT_TO_WHITE:
        for (i = paletteOffsetStart; i < paletteOffsetEnd; ++i)
        {
            struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[i];

            r = data->r + 2;
            g = data->g + 2;
            b = data->b + 2;
            if (r > 31)
                r = 31;
            if (g > 31)
                g = 31;
            if (b > 31)
                b = 31;
            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
        }
        break;
    case FAST_FADE_IN_FROM_BLACK:
        for (i = paletteOffsetStart; i < paletteOffsetEnd; ++i)
        {
            struct PlttData *unfaded;
            struct PlttData *faded;

            unfaded = (struct PlttData *)&gPlttBufferUnfaded[i];
            r0 = unfaded->r;
            g0 = unfaded->g;
            b0 = unfaded->b;
            faded = (struct PlttData *)&gPlttBufferFaded[i];
            r = faded->r + 2;
            g = faded->g + 2;
            b = faded->b + 2;
            if (r > r0)
                r = r0;
            if (g > g0)
                g = g0;
            if (b > b0)
                b = b0;
            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
        }
        break;
    case FAST_FADE_OUT_TO_BLACK:
        for (i = paletteOffsetStart; i < paletteOffsetEnd; ++i)
        {
            struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[i];

            r = data->r - 2;
            g = data->g - 2;
            b = data->b - 2;
            if (r < 0)
                r = 0;
            if (g < 0)
                g = 0;
            if (b < 0)
                b = 0;
            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
        }
    }
    gPaletteFade.objPaletteToggle ^= 1;
    if (gPaletteFade.objPaletteToggle)
        // gPaletteFade.active cannot change since the last time it was checked. So this
        // is equivalent to `return PALETTE_FADE_STATUS_ACTIVE;`
        return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
    if (gPaletteFade.y - gPaletteFade.deltaY < 0)
        gPaletteFade.y = 0;
    else
        gPaletteFade.y -= gPaletteFade.deltaY;
    if (gPaletteFade.y == 0)
    {
        switch (gPaletteFade_submode)
        {
        case FAST_FADE_IN_FROM_WHITE:
        case FAST_FADE_IN_FROM_BLACK:
            CpuCopy32(gPlttBufferUnfaded, gPlttBufferFaded, PLTT_SIZE);
            break;
        case FAST_FADE_OUT_TO_WHITE:
            CpuFill32(0xFFFFFFFF, gPlttBufferFaded, PLTT_SIZE);
            break;
        case FAST_FADE_OUT_TO_BLACK:
            CpuFill32(0x00000000, gPlttBufferFaded, PLTT_SIZE);
            break;
        }
        gPaletteFade.mode = NORMAL_FADE;
        gPaletteFade.softwareFadeFinishing = TRUE;
    }
    // gPaletteFade.active cannot change since the last time it was checked. So this
    // is equivalent to `return PALETTE_FADE_STATUS_ACTIVE;`
    return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
}

void BeginHardwarePaletteFade(u8 blendCnt, u8 delay, u8 y, u8 targetY, u8 shouldResetBlendRegisters)
{
    gPaletteFade_blendCnt = blendCnt;
    gPaletteFade.delayCounter = delay;
    gPaletteFade_delay = delay;
    gPaletteFade.y = y;
    gPaletteFade.targetY = targetY;
    gPaletteFade.active = TRUE;
    gPaletteFade.mode = HARDWARE_FADE;
    gPaletteFade.shouldResetBlendRegisters = shouldResetBlendRegisters & 1;
    gPaletteFade.hardwareFadeFinishing = FALSE;
    if (y < targetY)
        gPaletteFade.yDec = FALSE;
    else
        gPaletteFade.yDec = TRUE;
}

static u8 UpdateHardwarePaletteFade(void)
{
    if (!gPaletteFade.active)
        return PALETTE_FADE_STATUS_DONE;
    if (gPaletteFade.delayCounter < gPaletteFade_delay)
    {
        ++gPaletteFade.delayCounter;
        return PALETTE_FADE_STATUS_DELAY;
    }
    gPaletteFade.delayCounter = 0;
    if (!gPaletteFade.yDec)
    {
        ++gPaletteFade.y;
        if (gPaletteFade.y > gPaletteFade.targetY)
        {
            ++gPaletteFade.hardwareFadeFinishing;
            --gPaletteFade.y;
        }
    }
    else
    {
        if (gPaletteFade.y-- - 1 < gPaletteFade.targetY)
        {
            ++gPaletteFade.hardwareFadeFinishing;
            ++gPaletteFade.y;
        }
    }

    if (gPaletteFade.hardwareFadeFinishing)
    {
        if (gPaletteFade.shouldResetBlendRegisters)
        {
            gPaletteFade_blendCnt = 0;
            gPaletteFade.y = 0;
        }
        gPaletteFade.shouldResetBlendRegisters = FALSE;
    }
    // gPaletteFade.active cannot change since the last time it was checked. So this
    // is equivalent to `return PALETTE_FADE_STATUS_ACTIVE;`
    return gPaletteFade.active ? PALETTE_FADE_STATUS_ACTIVE : PALETTE_FADE_STATUS_DONE;
}

static void UpdateBlendRegisters(void)
{
    SetGpuReg(REG_OFFSET_BLDCNT, (u16)gPaletteFade_blendCnt);
    SetGpuReg(REG_OFFSET_BLDY, gPaletteFade.y);
    if (gPaletteFade.hardwareFadeFinishing)
    {
        gPaletteFade.hardwareFadeFinishing = FALSE;
        gPaletteFade.mode = 0;
        gPaletteFade_blendCnt = 0;
        gPaletteFade.y = 0;
        gPaletteFade.active = FALSE;
    }
}

static bool8 IsSoftwarePaletteFadeFinishing(void)
{
    if (gPaletteFade.softwareFadeFinishing)
    {
        if (gPaletteFade.softwareFadeFinishingCounter == 4)
        {
            gPaletteFade.active = FALSE;
            gPaletteFade.softwareFadeFinishing = FALSE;
            gPaletteFade.softwareFadeFinishingCounter = 0;
        }
        else
        {
            ++gPaletteFade.softwareFadeFinishingCounter;
        }
        return TRUE;
    }
    else
    {
        return FALSE;
    }
}

void BlendPalettes(u32 selectedPalettes, u8 coeff, u16 color)
{
    u16 paletteOffset;

    for (paletteOffset = 0; selectedPalettes; paletteOffset += 16)
    {
        if (selectedPalettes & 1)
            BlendPalette(paletteOffset, 16, coeff, color);
        selectedPalettes >>= 1;
    }
}

void BlendPalettesUnfaded(u32 selectedPalettes, u8 coeff, u16 color)
{
    // This copy is done via DMA in both RUBY and EMERALD
    CpuFastCopy(gPlttBufferUnfaded, gPlttBufferFaded, 0x400);
    BlendPalettes(selectedPalettes, coeff, color);
}

void TintPalette_GrayScale(u16 *palette, u16 count)
{
    s32 r, g, b, i;
    u32 gray;

    for (i = 0; i < count; ++i)
    {
        r = (*palette >>  0) & 0x1F;
        g = (*palette >>  5) & 0x1F;
        b = (*palette >> 10) & 0x1F;
        gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;
        *palette++ = (gray << 10) | (gray << 5) | (gray << 0);
    }
}

void TintPalette_GrayScale2(u16 *palette, u16 count)
{
    s32 r, g, b, i;
    u32 gray;

    for (i = 0; i < count; ++i)
    {
        r = (*palette >>  0) & 0x1F;
        g = (*palette >>  5) & 0x1F;
        b = (*palette >> 10) & 0x1F;
        gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;

        if (gray > 0x1F)
            gray = 0x1F;
        gray = sRoundedDownGrayscaleMap[gray];
        *palette++ = (gray << 10) | (gray << 5) | (gray << 0);
    }
}

void TintPalette_SepiaTone(u16 *palette, u16 count)
{
    s32 r, g, b, i;
    u32 gray;

    for (i = 0; i < count; ++i)
    {
        r = (*palette >>  0) & 0x1F;
        g = (*palette >>  5) & 0x1F;
        b = (*palette >> 10) & 0x1F;
        gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;
        r = (u16)((Q_8_8(1.2) * gray)) >> 8;
        g = (u16)((Q_8_8(1.0) * gray)) >> 8;
        b = (u16)((Q_8_8(0.94) * gray)) >> 8;
        if (r > 31)
            r = 31;
        *palette++ = (b << 10) | (g << 5) | (r << 0);
    }
}

void TintPalette_CustomTone(u16 *palette, u16 count, u16 rTone, u16 gTone, u16 bTone)
{
    s32 r, g, b, i;
    u32 gray;

    for (i = 0; i < count; ++i)
    {
        r = (*palette >>  0) & 0x1F;
        g = (*palette >>  5) & 0x1F;
        b = (*palette >> 10) & 0x1F;
        gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;
        r = (u16)((rTone * gray)) >> 8;
        g = (u16)((gTone * gray)) >> 8;
        b = (u16)((bTone * gray)) >> 8;
        if (r > 31)
            r = 31;
        if (g > 31)
            g = 31;
        if (b > 31)
            b = 31;
        *palette++ = (b << 10) | (g << 5) | (r << 0);
    }
}

void sub_80716F8(const u16 *src, u16 *dst, u16 count, u8 a4)
{
    s32 r, g, b, i;
    u32 gray;

    if (!a4)
    {
        for (i = 0; i < count; ++i)
            *dst++ = *src++;
    }
    else
    {
        for (i = 0; i < count; ++src, ++dst, ++i)
        {
            r = (*src >>  0) & 0x1F;
            g = (*src >>  5) & 0x1F;
            b = (*src >> 10) & 0x1F;
            gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;
            r += (a4 * (gray - r) >> 4);
            g += (a4 * (gray - g) >> 4);
            b += (a4 * (gray - b) >> 4);
            *dst = (b << 10) | (g << 5) | (r << 0);
        }
    }
}

void sub_80717A8(u32 a1, s8 a2, u8 a3, u8 a4, u16 a5, u8 a6, u8 a7)
{
    u8 taskId;

    taskId = CreateTask(sub_80718B8, a6);
    gTasks[taskId].data[0] = a3;
    gTasks[taskId].data[1] = a4;
    if (a2 >= 0)
    {
        gTasks[taskId].data[3] = a2;
        gTasks[taskId].data[2] = 1;
    }
    else
    {
        gTasks[taskId].data[3] = 0;
        gTasks[taskId].data[2] = -a2 + 1;
    }
    if (a4 < a3)
        gTasks[taskId].data[2] *= -1;
    SetWordTaskArg(taskId, 5, a1);
    gTasks[taskId].data[7] = a5;
    gTasks[taskId].data[8] = a7;
    gTasks[taskId].func(taskId);
}

bool32 sub_807185C(u8 var)
{
    s32 i;

    for (i = 0; i < NUM_TASKS; ++i)
        if (gTasks[i].isActive == TRUE
         && gTasks[i].func == sub_80718B8
         && gTasks[i].data[8] == var)
            return TRUE;
    return FALSE;
}

void sub_8071898(void)
{
    u8 taskId;

    while (TRUE)
    {
        taskId = FindTaskIdByFunc(sub_80718B8);
        if (taskId == TAIL_SENTINEL)
            break;
        DestroyTask(taskId);
    }
}

static void sub_80718B8(u8 taskId)
{
    u32 wordVar;
    s16 *data;
    s16 temp;

    data = gTasks[taskId].data;
    wordVar = GetWordTaskArg(taskId, 5);
    if (++data[4] > data[3])
    {
        data[4] = 0;
        BlendPalettes(wordVar, data[0], data[7]);
        temp = data[1];
        if (data[0] == temp)
        {
            DestroyTask(taskId);
        }
        else
        {
            data[0] += data[2];
            if (data[2] >= 0)
            {
                if (data[0] < temp)
                    return;
            }
            else if (data[0] > temp)
            {
                return;
            }
            data[0] = temp;
        }
    }
}