/*****************************************************************************
 * Free42 -- an HP-42S calculator simulator
 * Copyright (C) 2004-2017  Thomas Okken
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2,
 * as published by the Free Software Foundation.
 *
 * 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, see http://www.gnu.org/licenses/.
 *****************************************************************************/

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "shell_skin.h"
#include "shell_loadimage.h"
#include "core_main.h"


/**************************/
/* Skin description stuff */
/**************************/

typedef struct {
    int x, y;
} SkinPoint;

typedef struct {
    int x, y, width, height;
} SkinRect;

typedef struct {
    int code, shifted_code;
    SkinRect sens_rect;
    SkinRect disp_rect;
    SkinPoint src;
} SkinKey;

#define SKIN_MAX_MACRO_LENGTH 63

typedef struct _SkinMacro {
    int code;
    unsigned char macro[SKIN_MAX_MACRO_LENGTH + 1];
    struct _SkinMacro *next;
} SkinMacro;

typedef struct {
    SkinRect disp_rect;
    SkinPoint src;
} SkinAnnunciator;

static SkinRect skin;
static SkinPoint display_loc;
static SkinPoint display_scale;
static COLORREF display_bg, display_fg;
static SkinKey *keylist = NULL;
static int nkeys = 0;
static int keys_cap = 0;
static SkinMacro *macrolist = NULL;
static SkinAnnunciator annunciators[7];

static FILE *external_file;
static long builtin_length;
static long builtin_pos;
static const unsigned char *builtin_file;

static int skin_type;
static int skin_width, skin_height;
static int skin_ncolors;
static const SkinColor *skin_colors = NULL;
static int skin_y;
static unsigned char *skin_bitmap = NULL;
static int skin_bytesperline;
static BITMAPV4HEADER *skin_header = NULL;
static HBITMAP skin_dib = NULL;
static unsigned char *disp_bitmap = NULL;
static int disp_bytesperline;

static keymap_entry *keymap = NULL;
static int keymap_length = 0;

static bool display_enabled = true;


/**********************************************************/
/* Linked-in skins; defined in the skins.c, which in turn */
/* is generated by skin2c.c under control of skin2c.conf  */
/**********************************************************/

extern int skin_count;
extern const char *skin_name[];
extern long skin_layout_size[];
extern unsigned char *skin_layout_data[];
extern long skin_bitmap_size[];
extern unsigned char *skin_bitmap_data[];


/*****************/
/* Keymap parser */
/*****************/

keymap_entry *parse_keymap_entry(char *line, int lineno) {
    char *p;
    static keymap_entry entry;

    p =  strchr(line, '#');
    if (p != NULL)
        *p = 0;
    p = strchr(line, '\n');
    if (p != NULL)
        *p = 0;
    p = strchr(line, '\r');
    if (p != NULL)
        *p = 0;

    p = strchr(line, ':');
    if (p != NULL) {
        char *val = p + 1;
        char *tok;
        bool ctrl = false;
        bool alt = false;
        bool shift = false;
        bool cshift = false;
        int keycode = 0;
        int done = 0;
        unsigned char macro[KEYMAP_MAX_MACRO_LENGTH + 1];
        int macrolen = 0;

        /* Parse keycode */
        *p = 0;
        tok = strtok(line, " \t");
        while (tok != NULL) {
            if (done) {
                fprintf(stderr, "Keymap, line %d: Excess tokens in key spec.\n", lineno);
                return NULL;
            }
            if (_stricmp(tok, "ctrl") == 0)
                ctrl = true;
            else if (_stricmp(tok, "alt") == 0)
                alt = true;
            else if (_stricmp(tok, "shift") == 0)
                shift = true;
            else if (_stricmp(tok, "cshift") == 0)
                cshift = true;
            else {
                char *endptr;
                long k = strtol(tok, &endptr, 10);
                if (k < 1 || *endptr != 0) {
                    fprintf(stderr, "Keymap, line %d: Bad keycode.\n", lineno);
                    return NULL;
                }
                keycode = k;
                done = 1;
            }
            tok = strtok(NULL, " \t");
        }
        if (!done) {
            fprintf(stderr, "Keymap, line %d: Unrecognized keycode.\n", lineno);
            return NULL;
        }

        /* Parse macro */
        tok = strtok(val, " \t");
        while (tok != NULL) {
            char *endptr;
            long k = strtol(tok, &endptr, 10);
            if (*endptr != 0 || k < 1 || k > 255) {
                fprintf(stderr, "Keymap, line %d: Bad value (%s) in macro.\n", lineno, tok);
                return NULL;
            } else if (macrolen == KEYMAP_MAX_MACRO_LENGTH) {
                fprintf(stderr, "Keymap, line %d: Macro too long (max=%d).\n", lineno, KEYMAP_MAX_MACRO_LENGTH);
                return NULL;
            } else
                macro[macrolen++] = (unsigned char) k;
            tok = strtok(NULL, " \t");
        }
        macro[macrolen] = 0;

        entry.ctrl = ctrl;
        entry.alt = alt;
        entry.shift = shift;
        entry.cshift = cshift;
        entry.keycode = keycode;
        strcpy((char *) entry.macro, (const char *) macro);
        return &entry;
    } else
        return NULL;
}


/*******************/
/* Local functions */
/*******************/

static int skin_open(const char *skinname, const char *basedir, int open_layout);
static int skin_gets(char *buf, int buflen);
static void skin_close();


static int skin_open(const char *skinname, const char *basedir, int open_layout) {
    int i;
    char namebuf[1024];
    char exedir[MAX_PATH];
    char *lastbackslash;

    /* Look for built-in skin first */
    for (i = 0; i < skin_count; i++) {
        if (strcmp(skinname, skin_name[i]) == 0) {
            external_file = NULL;
            builtin_pos = 0;
            if (open_layout) {
                builtin_length = skin_layout_size[i];
                builtin_file = skin_layout_data[i];
            } else {
                builtin_length = skin_bitmap_size[i];
                builtin_file = skin_bitmap_data[i];
            }
            return 1;
        }
    }

    /* name did not match a built-in skin; look for file */
    sprintf(namebuf, "%s\\%s.%s", basedir, skinname,
                                        open_layout ? "layout" : "gif");
    external_file = fopen(namebuf, "rb");
    if (external_file != NULL)
        return 1;

    /* name did not match in home dir; now try in exe dir */
    GetModuleFileName(0, exedir, MAX_PATH - 1);
    lastbackslash = strrchr(exedir, '\\');
    if (lastbackslash != 0)
        *lastbackslash = 0;
    else
        strcpy(exedir, "C:");
    sprintf(namebuf, "%s\\%s.%s", exedir, skinname,
                                        open_layout ? "layout" : "gif");
    external_file = fopen(namebuf, "rb");
    return external_file != NULL;
}

int skin_getchar() {
    if (external_file != NULL)
        return fgetc(external_file);
    else if (builtin_pos < builtin_length)
        return builtin_file[builtin_pos++];
    else
        return EOF;
}

static int skin_gets(char *buf, int buflen) {
    int p = 0;
    int eof = -1;
    int comment = 0;
    while (p < buflen - 1) {
        int c = skin_getchar();
        if (eof == -1)
            eof = c == EOF;
        if (c == EOF || c == '\n' || c == '\r')
            break;
        /* Remove comments */
        if (c == '#')
            comment = 1;
        if (comment)
            continue;
        /* Suppress leading spaces */
        if (p == 0 && isspace(c))
            continue;
        buf[p++] = c;
    }
    buf[p++] = 0;
    return p > 1 || !eof;
}

static void skin_close() {
    if (external_file != NULL)
        fclose(external_file);
}

void skin_load(char *skinname, const char *basedir, long *width, long *height) {
    char line[1024];
    int success;
    int size;
    int kmcap = 0;
    int lineno = 0;

    if (skinname[0] == 0) {
        fallback_on_1st_builtin_skin:
        strcpy(skinname, skin_name[0]);
    }

    /*************************/
    /* Load skin description */
    /*************************/

    if (!skin_open(skinname, basedir, 1))
        goto fallback_on_1st_builtin_skin;

    if (keylist != NULL)
        free(keylist);
    keylist = NULL;
    nkeys = 0;
    keys_cap = 0;

    while (macrolist != NULL) {
        SkinMacro *m = macrolist->next;
        free(macrolist);
        macrolist = m;
    }

    if (keymap != NULL)
        free(keymap);
    keymap = NULL;
    keymap_length = 0;

    while (skin_gets(line, 1024)) {
        lineno++;
        if (*line == 0)
            continue;
        if (_strnicmp(line, "skin:", 5) == 0) {
            int x, y, width, height;
            if (sscanf(line + 5, " %d,%d,%d,%d", &x, &y, &width, &height) == 4){
                skin.x = x;
                skin.y = y;
                skin.width = width;
                skin.height = height;
            }
        } else if (_strnicmp(line, "display:", 8) == 0) {
            int x, y, xscale, yscale;
            unsigned long bg, fg;
            if (sscanf(line + 8, " %d,%d %d %d %lx %lx", &x, &y,
                                            &xscale, &yscale, &bg, &fg) == 6) {
                display_loc.x = x;
                display_loc.y = y;
                display_scale.x = xscale;
                display_scale.y = yscale;
                display_bg = ((bg >> 16) & 255) | (bg & 0x0FF00) | ((bg & 255) << 16);
                display_fg = ((fg >> 16) & 255) | (fg & 0x0FF00) | ((fg & 255) << 16);
            }
        } else if (_strnicmp(line, "key:", 4) == 0) {
            char keynumbuf[20];
            int keynum, shifted_keynum;
            int sens_x, sens_y, sens_width, sens_height;
            int disp_x, disp_y, disp_width, disp_height;
            int act_x, act_y;
            if (sscanf(line + 4, " %s %d,%d,%d,%d %d,%d,%d,%d %d,%d",
                                 keynumbuf,
                                 &sens_x, &sens_y, &sens_width, &sens_height,
                                 &disp_x, &disp_y, &disp_width, &disp_height,
                                 &act_x, &act_y) == 11) {
                int n = sscanf(keynumbuf, "%d,%d", &keynum, &shifted_keynum);
                if (n > 0) {
                    if (n == 1)
                        shifted_keynum = keynum;
                    SkinKey *key;
                    if (nkeys == keys_cap) {
                        keys_cap += 50;
                        keylist = (SkinKey *) realloc(keylist, keys_cap * sizeof(SkinKey));
                        // TODO - handle memory allocation failure
                    }
                    key = keylist + nkeys;
                    key->code = keynum;
                    key->shifted_code = shifted_keynum;
                    key->sens_rect.x = sens_x;
                    key->sens_rect.y = sens_y;
                    key->sens_rect.width = sens_width;
                    key->sens_rect.height = sens_height;
                    key->disp_rect.x = disp_x;
                    key->disp_rect.y = disp_y;
                    key->disp_rect.width = disp_width;
                    key->disp_rect.height = disp_height;
                    key->src.x = act_x;
                    key->src.y = act_y;
                    nkeys++;
                }
            }
        } else if (_strnicmp(line, "macro:", 6) == 0) {
            char *tok = strtok(line + 6, " \t");
            int len = 0;
            SkinMacro *macro = NULL;
            while (tok != NULL) {
                char *endptr;
                long n = strtol(tok, &endptr, 10);
                if (*endptr != 0) {
                    /* Not a proper number; ignore this macro */
                    if (macro != NULL) {
                        free(macro);
                        macro = NULL;
                        break;
                    }
                }
                if (macro == NULL) {
                    if (n < 38 || n > 255)
                        /* Macro code out of range; ignore this macro */
                        break;
                    macro = (SkinMacro *) malloc(sizeof(SkinMacro));
                    // TODO - handle memory allocation failure
                    macro->code = n;
                } else if (len < SKIN_MAX_MACRO_LENGTH) {
                    if (n < 1 || n > 37) {
                        /* Key code out of range; ignore this macro */
                        free(macro);
                        macro = NULL;
                        break;
                    }
                    macro->macro[len++] = (unsigned char) n;
                }
                tok = strtok(NULL, " \t");
            }
            if (macro != NULL) {
                macro->macro[len++] = 0;
                macro->next = macrolist;
                macrolist = macro;
            }
        } else if (_strnicmp(line, "annunciator:", 12) == 0) {
            int annnum;
            int disp_x, disp_y, disp_width, disp_height;
            int act_x, act_y;
            if (sscanf(line + 12, " %d %d,%d,%d,%d %d,%d",
                                  &annnum,
                                  &disp_x, &disp_y, &disp_width, &disp_height,
                                  &act_x, &act_y) == 7) {
                if (annnum >= 1 && annnum <= 7) {
                    SkinAnnunciator *ann = annunciators + (annnum - 1);
                    ann->disp_rect.x = disp_x;
                    ann->disp_rect.y = disp_y;
                    ann->disp_rect.width = disp_width;
                    ann->disp_rect.height = disp_height;
                    ann->src.x = act_x;
                    ann->src.y = act_y;
                }
            }
        } else if (strchr(line, ':') != 0) {
            keymap_entry *entry = parse_keymap_entry(line, lineno);
            if (entry != NULL) {
                if (keymap_length == kmcap) {
                    kmcap += 50;
                    keymap = (keymap_entry *) realloc(keymap, kmcap * sizeof(keymap_entry));
                    // TODO - handle memory allocation failure
                }
                memcpy(keymap + (keymap_length++), entry, sizeof(keymap_entry));
            }
        }
    }

    skin_close();

    /********************/
    /* Load skin bitmap */
    /********************/

    if (!skin_open(skinname, basedir, 0))
        goto fallback_on_1st_builtin_skin;

    /* shell_loadimage() calls skin_getchar() to load the image from the
     * compiled-in or on-disk file; it calls skin_init_image(),
     * skin_put_pixels(), and skin_finish_image() to create the in-memory
     * representation.
     */
    success = shell_loadimage();
    skin_close();

    if (!success)
        goto fallback_on_1st_builtin_skin;

    *width = skin.width;
    *height = skin.height;

    /********************************/
    /* (Re)build the display bitmap */
    /********************************/

    if (disp_bitmap != NULL)
        free(disp_bitmap);
    disp_bytesperline = ((131 * display_scale.x + 15) >> 3) & ~1;
    size = disp_bytesperline * 16 * display_scale.y;
    disp_bitmap = (unsigned char *) malloc(size);
    // TODO - handle memory allocation failure
    memset(disp_bitmap, 255, size);
}

int skin_init_image(int type, int ncolors, const SkinColor *colors,
                    int width, int height) {
    if (skin_bitmap != NULL) {
        free(skin_bitmap);
        skin_bitmap = NULL;
    }
    if (skin_dib != NULL) {
        DeleteObject(skin_dib);
        skin_dib = NULL;
    }
    if (skin_header != NULL) {
        free(skin_header);
        skin_header = NULL;
    }

    skin_type = type;
    skin_ncolors = ncolors;
    skin_colors = colors;
    
    switch (type) {
        case IMGTYPE_MONO:
            skin_bytesperline = ((width + 15) >> 3) & ~1;
            break;
        case IMGTYPE_GRAY:
        case IMGTYPE_COLORMAPPED:
            skin_bytesperline = (width + 3) & ~3;
            break;
        case IMGTYPE_TRUECOLOR:
            skin_bytesperline = (width * 3 + 3) & ~3;
            break;
        default:
            return 0;
    }

    skin_bitmap = (unsigned char *) malloc(skin_bytesperline * height);
    // TODO - handle memory allocation failure
    skin_width = width;
    skin_height = height;
    skin_y = 0;
    return skin_bitmap != NULL;
}

void skin_put_pixels(unsigned const char *data) {
    unsigned char *dst = skin_bitmap + skin_y * skin_bytesperline;
    if (skin_type == IMGTYPE_MONO) {
        int i;
        for (i = 0; i < skin_bytesperline; i++) {
            unsigned char c = data[i];
            c = (c >> 7) | ((c >> 5) & 2) | ((c >> 3) & 4) | ((c >> 1) & 8)
                | ((c << 1) & 16) | ((c << 3) & 32) | ((c << 5) & 64) | (c << 7);
            dst[i] = c;
        }
    } else if (skin_type == IMGTYPE_TRUECOLOR) {
        int i;
        for (i = 0; i < skin_width; i++) {
            data++;
            *dst++ = *data++;
            *dst++ = *data++;
            *dst++ = *data++;
        }
    } else
        memcpy(dst, data, skin_bytesperline);
    skin_y++;
}

void skin_finish_image() {
    BITMAPV4HEADER *bh;
    
    if (skin_type == IMGTYPE_MONO) {
        skin_dib = CreateBitmap(skin_width, skin_height, 1, 1, skin_bitmap);
        skin_header = NULL;
        return;
    }

    if (skin_type == IMGTYPE_COLORMAPPED) {
        RGBQUAD *cmap;
        int i;
        bh = (BITMAPV4HEADER *) malloc(sizeof(BITMAPV4HEADER) + skin_ncolors * sizeof(RGBQUAD));
        // TODO - handle memory allocation failure
        cmap = (RGBQUAD *) (bh + 1);
        for (i = 0; i < skin_ncolors; i++) {
            cmap[i].rgbRed = skin_colors[i].r;
            cmap[i].rgbGreen = skin_colors[i].g;
            cmap[i].rgbBlue = skin_colors[i].b;
            cmap[i].rgbReserved = 0;
        }
    } else if (skin_type == IMGTYPE_GRAY) {
        RGBQUAD *cmap;
        int i;
        bh = (BITMAPV4HEADER *) malloc(sizeof(BITMAPV4HEADER) + 256 * sizeof(RGBQUAD));
        // TODO - handle memory allocation failure
        cmap = (RGBQUAD *) (bh + 1);
        for (i = 0; i < 256; i++) {
            cmap[i].rgbRed = cmap[i].rgbGreen = cmap[i].rgbBlue = i;
            cmap[i].rgbReserved = 0;
        }
    } else
        bh = (BITMAPV4HEADER *) malloc(sizeof(BITMAPV4HEADER));
        // TODO - handle memory allocation failure

    bh->bV4Size = sizeof(BITMAPV4HEADER);
    bh->bV4Width = skin_width;
    bh->bV4Height = -skin_height;
    bh->bV4Planes = 1;
    switch (skin_type) {
        case IMGTYPE_MONO:
            bh->bV4BitCount = 1;
            bh->bV4ClrUsed = 0;
            break;
        case IMGTYPE_GRAY:
            bh->bV4BitCount = 8;
            bh->bV4ClrUsed = 256;
            break;
        case IMGTYPE_COLORMAPPED:
            bh->bV4BitCount = 8;
            bh->bV4ClrUsed = skin_ncolors;
            break;
        case IMGTYPE_TRUECOLOR:
            bh->bV4BitCount = 24;
            bh->bV4ClrUsed = 0;
            break;
    }
    bh->bV4V4Compression = BI_RGB;
    bh->bV4SizeImage = skin_bytesperline * skin_height;
    bh->bV4XPelsPerMeter = 2835;
    bh->bV4YPelsPerMeter = 2835;
    bh->bV4ClrImportant = 0;
    /* bh->bV4RedMask, bh->bV4GreenMask, bh->bV4BlueMask, bh->bV4AlphaMask: unused */
    //bh->bV4CSType = LCS_WINDOWS_COLOR_SPACE;
    bh->bV4CSType = LCS_CALIBRATED_RGB;
    /* bh->bV4Endpoints, bh->bV4GammaRed, bh->bV4GammaGreen, bh->bV4GammaBlue: unused */
    
    skin_header = bh;
}

static int make_dib(HDC hdc) {
    void *bits;
    if (skin_type == IMGTYPE_MONO) {
        /* Not using a DIB, but a regular monochrome bitmap;
         * this bitmap was already created in skin_finish_image(),
         * since, unlike a DIB, no DC is required to create it.
         */
        return 1;
    }
    if (skin_header == NULL)
        return 0;
    if (skin_dib == NULL) {
        skin_dib = CreateDIBSection(hdc, (BITMAPINFO *) skin_header, DIB_RGB_COLORS, &bits, NULL, 0);
        if (skin_dib == NULL)
            return 0;
        memcpy(bits, skin_bitmap, skin_bytesperline * skin_height);
        free(skin_bitmap);
        skin_bitmap = NULL;
    }
    return 1;
}

void skin_repaint(HDC hdc, HDC memdc) {
    COLORREF old_bg, old_fg;
    if (!make_dib(memdc))
        return;
    SelectObject(memdc, skin_dib);
    if (skin_type == IMGTYPE_MONO) {
        old_bg = SetBkColor(hdc, 0x00ffffff);
        old_fg = SetTextColor(hdc, 0x00000000);
    }
    BitBlt(hdc, 0, 0, skin.width, skin.height, memdc, skin.x, skin.y, SRCCOPY);
    if (skin_type == IMGTYPE_MONO) {
        SetBkColor(hdc, old_bg);
        SetTextColor(hdc, old_fg);
    }
}

void skin_repaint_annunciator(HDC hdc, HDC memdc, int which, int state) {
    if (!display_enabled)
        return;
    SkinAnnunciator *ann = annunciators + (which - 1);
    COLORREF old_bg, old_fg;
    if (!make_dib(memdc))
        return;
    SelectObject(memdc, skin_dib);
    if (skin_type == IMGTYPE_MONO) {
        old_bg = SetBkColor(hdc, 0x00ffffff);
        old_fg = SetTextColor(hdc, 0x00000000);
    }
    if (state)
        BitBlt(hdc, ann->disp_rect.x, ann->disp_rect.y, ann->disp_rect.width, ann->disp_rect.height,
               memdc, ann->src.x, ann->src.y, SRCCOPY);
    else
        BitBlt(hdc, ann->disp_rect.x, ann->disp_rect.y, ann->disp_rect.width, ann->disp_rect.height,
               memdc, ann->disp_rect.x, ann->disp_rect.y, SRCCOPY);
    if (skin_type == IMGTYPE_MONO) {
        SetBkColor(hdc, old_bg);
        SetTextColor(hdc, old_fg);
    }
}

void skin_find_key(int x, int y, bool cshift, int *skey, int *ckey) {
    int i;
    if (core_menu()
            && x >= display_loc.x
            && x < display_loc.x + 131 * display_scale.x
            && y >= display_loc.y + 9 * display_scale.y
            && y < display_loc.y + 16 * display_scale.y) {
        int softkey = (x - display_loc.x) / (22 * display_scale.x) + 1;
        *skey = -1 - softkey;
        *ckey = softkey;
        return;
    }
    for (i = 0; i < nkeys; i++) {
        SkinKey *k = keylist + i;
        int rx = x - k->sens_rect.x;
        int ry = y - k->sens_rect.y;
        if (rx >= 0 && rx < k->sens_rect.width
                && ry >= 0 && ry < k->sens_rect.height) {
            *skey = i;
            *ckey = cshift ? k->shifted_code : k->code;
            return;
        }
    }
    *skey = -1;
    *ckey = 0;
}

int skin_find_skey(int ckey) {
    int i;
    for (i = 0; i < nkeys; i++)
        if (keylist[i].code == ckey || keylist[i].shifted_code == ckey)
            return i;
    return -1;
}

unsigned char *skin_find_macro(int ckey) {
    SkinMacro *m = macrolist;
    while (m != NULL) {
        if (m->code == ckey)
            return m->macro;
        m = m->next;
    }
    return NULL;
}

unsigned char *skin_keymap_lookup(int keycode, bool ctrl, bool alt, bool shift, bool cshift, bool *exact) {
    int i;
    unsigned char *macro = NULL;
    for (i = 0; i < keymap_length; i++) {
        keymap_entry *entry = keymap + i;
        if (keycode == entry->keycode
                && ctrl == entry->ctrl
                && alt == entry->alt
                && shift == entry->shift) {
            macro = entry->macro;
            if (cshift == entry->cshift) {
                *exact = true;
                return macro;
            }
        }
    }
    *exact = false;
    return macro;
}

void skin_repaint_key(HDC hdc, HDC memdc, int key, int state) {
    SkinKey *k;
    COLORREF old_bg, old_fg;

    if (key >= -7 && key <= -2) {
        /* Soft key */
        if (!display_enabled)
            // Should never happen -- the display is only disabled during macro
            // execution, and softkey events should be impossible to generate
            // in that state. But, just staying on the safe side.
            return;
        int x, y, w, h;
        HBITMAP bitmap;
        if (state) {
            old_bg = SetBkColor(hdc, display_fg);
            old_fg = SetTextColor(hdc, display_bg);
        } else {
            old_bg = SetBkColor(hdc, display_bg);
            old_fg = SetTextColor(hdc, display_fg);
        }
        key = -1 - key;
        x = (key - 1) * 22 * display_scale.x;
        y = 9 * display_scale.y;
        w = 131 * display_scale.x;
        h = 16 * display_scale.y;
        bitmap = CreateBitmap(w, h, 1, 1, disp_bitmap);
        SelectObject(memdc, bitmap);
        BitBlt(hdc, display_loc.x + x, display_loc.y + y,
               21 * display_scale.x, 7 * display_scale.y,
               memdc, x, y, SRCCOPY);
        SetBkColor(hdc, old_bg);
        SetTextColor(hdc, old_fg);
        DeleteObject(bitmap);
        return;
    }

    if (key < 0 || key >= nkeys)
        return;
    if (!make_dib(memdc))
        return;
    SelectObject(memdc, skin_dib);
    k = keylist + key;
    if (skin_type == IMGTYPE_MONO) {
        old_bg = SetBkColor(hdc, 0x00ffffff);
        old_fg = SetTextColor(hdc, 0x00000000);
    }
    if (state)
        BitBlt(hdc, k->disp_rect.x, k->disp_rect.y, k->disp_rect.width, k->disp_rect.height,
               memdc, k->src.x, k->src.y, SRCCOPY);
    else
        BitBlt(hdc, k->disp_rect.x, k->disp_rect.y, k->disp_rect.width, k->disp_rect.height,
               memdc, k->disp_rect.x, k->disp_rect.y, SRCCOPY);
    if (skin_type == IMGTYPE_MONO) {
        SetBkColor(hdc, old_bg);
        SetTextColor(hdc, old_fg);
    }
}

void skin_display_blitter(HDC hdc, const char *bits, int bytesperline, int x, int y,
                                     int width, int height) {
    int h, v, hh, vv;
    int sx = display_scale.x;
    int sy = display_scale.y;

    for (v = y; v < y + height; v++)
        for (h = x; h < x + width; h++) {
            int pixel = (bits[v * bytesperline + (h >> 3)] & (1 << (h & 7))) == 0;
            for (vv = v * sy; vv < (v + 1) * sy; vv++)
                for (hh = h * sx; hh < (h + 1) * sx; hh++)
                    if (pixel)
                        disp_bitmap[vv * disp_bytesperline + (hh >> 3)] |= 128 >> (hh & 7);
                    else
                        disp_bitmap[vv * disp_bytesperline + (hh >> 3)] &= ~(128 >> (hh & 7));
        }
    
    if (display_enabled) {
        HDC memdc = CreateCompatibleDC(hdc);
        HBITMAP bitmap = CreateBitmap(131 * sx, 16 * sy, 1, 1, disp_bitmap);
        SelectObject(memdc, bitmap);

        COLORREF old_bg = SetBkColor(hdc, display_bg);
        COLORREF old_fg = SetTextColor(hdc, display_fg);
        BitBlt(hdc, display_loc.x + x * sx, display_loc.y + y * sy,
                    width * sx, height * sy, memdc, x * sx, y * sy, SRCCOPY);
        SetBkColor(hdc, old_bg);
        SetTextColor(hdc, old_fg);

        DeleteDC(memdc);
        DeleteObject(bitmap);
    }
}

void skin_repaint_display(HDC hdc, HDC memdc) {
    if (!display_enabled)
        return;
    int w = 131 * display_scale.x;
    int h = 16 * display_scale.y;
    HBITMAP bitmap = CreateBitmap(w, h, 1, 1, disp_bitmap);

    SelectObject(memdc, bitmap);

    COLORREF old_bg = SetBkColor(hdc, display_bg);
    COLORREF old_fg = SetTextColor(hdc, display_fg);
    BitBlt(hdc, display_loc.x, display_loc.y, w, h, memdc, 0, 0, SRCCOPY);
    SetBkColor(hdc, old_bg);
    SetTextColor(hdc, old_fg);

    DeleteObject(bitmap);
}

void skin_display_set_enabled(bool enable) {
    display_enabled = enable;
}
