/*
 * The Python Imaging Library
 * $Id$
 *
 * paste image on another image
 *
 * history:
 * 96-03-27 fl  Created
 * 96-07-16 fl  Support "1", "L" and "RGBA" masks
 * 96-08-16 fl  Merged with opaque paste
 * 97-01-17 fl  Faster blending, added support for RGBa images
 * 97-08-27 fl  Faster masking for 32-bit images
 * 98-02-02 fl  Fixed MULDIV255 macro for gcc
 * 99-02-02 fl  Added "RGBa" mask support
 * 99-02-06 fl  Rewritten.  Added support for masked fill operations.
 * 99-12-08 fl  Fixed matte fill.
 *
 * Copyright (c) Fredrik Lundh 1996-97.
 * Copyright (c) Secret Labs AB 1997-99.
 *
 * See the README file for information on usage and redistribution.
 */

#include "Imaging.h"

static inline void
paste(
    Imaging imOut,
    Imaging imIn,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* paste opaque region */

    int y;

    dx *= pixelsize;
    sx *= pixelsize;

    xsize *= pixelsize;

    for (y = 0; y < ysize; y++) {
        memcpy(imOut->image[y + dy] + dx, imIn->image[y + sy] + sx, xsize);
    }
}

static inline void
paste_mask_1(
    Imaging imOut,
    Imaging imIn,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* paste with mode "1" mask */

    int x, y;

    if (imOut->image8) {
        int in_i16 = strncmp(imIn->mode, "I;16", 4) == 0;
        int out_i16 = strncmp(imOut->mode, "I;16", 4) == 0;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            if (out_i16) {
                out += dx;
            }
            UINT8 *in = imIn->image8[y + sy] + sx;
            if (in_i16) {
                in += sx;
            }
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                if (*mask) {
                    *out = *in;
                }
                if (in_i16) {
                    in++;
                }
                if (out_i16) {
                    out++;
                    if (*mask) {
                        *out = *in;
                    }
                }
                out++, in++, mask++;
            }
        }

    } else {
        for (y = 0; y < ysize; y++) {
            INT32 *out = imOut->image32[y + dy] + dx;
            INT32 *in = imIn->image32[y + sy] + sx;
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                if (*mask++) {
                    *out = *in;
                }
                out++, in++;
            }
        }
    }
}

static inline void
paste_mask_L(
    Imaging imOut,
    Imaging imIn,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* paste with mode "L" matte */

    int x, y;
    unsigned int tmp1;

    if (imOut->image8) {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *in = imIn->image8[y + sy] + sx;
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                *out = BLEND(*mask, *out, *in, tmp1);
                out++, in++, mask++;
            }
        }

    } else {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)(imOut->image32[y + dy] + dx);
            UINT8 *in = (UINT8 *)(imIn->image32[y + sy] + sx);
            UINT8 *mask = (UINT8 *)(imMask->image8[y + sy] + sx);
            for (x = 0; x < xsize; x++) {
                UINT8 a = mask[0];
                out[0] = BLEND(a, out[0], in[0], tmp1);
                out[1] = BLEND(a, out[1], in[1], tmp1);
                out[2] = BLEND(a, out[2], in[2], tmp1);
                out[3] = BLEND(a, out[3], in[3], tmp1);
                out += 4;
                in += 4;
                mask++;
            }
        }
    }
}

static inline void
paste_mask_RGBA(
    Imaging imOut,
    Imaging imIn,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* paste with mode "RGBA" matte */

    int x, y;
    unsigned int tmp1;

    if (imOut->image8) {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *in = imIn->image8[y + sy] + sx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx * 4 + 3;
            for (x = 0; x < xsize; x++) {
                *out = BLEND(*mask, *out, *in, tmp1);
                out++, in++, mask += 4;
            }
        }

    } else {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)(imOut->image32[y + dy] + dx);
            UINT8 *in = (UINT8 *)(imIn->image32[y + sy] + sx);
            UINT8 *mask = (UINT8 *)(imMask->image32[y + sy] + sx);
            for (x = 0; x < xsize; x++) {
                UINT8 a = mask[3];
                out[0] = BLEND(a, out[0], in[0], tmp1);
                out[1] = BLEND(a, out[1], in[1], tmp1);
                out[2] = BLEND(a, out[2], in[2], tmp1);
                out[3] = BLEND(a, out[3], in[3], tmp1);
                out += 4;
                in += 4;
                mask += 4;
            }
        }
    }
}

static inline void
paste_mask_RGBa(
    Imaging imOut,
    Imaging imIn,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* paste with mode "RGBa" matte */

    int x, y;
    unsigned int tmp1;

    if (imOut->image8) {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *in = imIn->image8[y + sy] + sx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx * 4 + 3;
            for (x = 0; x < xsize; x++) {
                *out = PREBLEND(*mask, *out, *in, tmp1);
                out++, in++, mask += 4;
            }
        }

    } else {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)(imOut->image32[y + dy] + dx);
            UINT8 *in = (UINT8 *)(imIn->image32[y + sy] + sx);
            UINT8 *mask = (UINT8 *)(imMask->image32[y + sy] + sx);
            for (x = 0; x < xsize; x++) {
                UINT8 a = mask[3];
                out[0] = PREBLEND(a, out[0], in[0], tmp1);
                out[1] = PREBLEND(a, out[1], in[1], tmp1);
                out[2] = PREBLEND(a, out[2], in[2], tmp1);
                out[3] = PREBLEND(a, out[3], in[3], tmp1);
                out += 4;
                in += 4;
                mask += 4;
            }
        }
    }
}

int
ImagingPaste(
    Imaging imOut, Imaging imIn, Imaging imMask, int dx0, int dy0, int dx1, int dy1
) {
    int xsize, ysize;
    int pixelsize;
    int sx0, sy0;
    ImagingSectionCookie cookie;

    if (!imOut || !imIn) {
        (void)ImagingError_ModeError();
        return -1;
    }

    pixelsize = imOut->pixelsize;

    xsize = dx1 - dx0;
    ysize = dy1 - dy0;

    if (xsize != imIn->xsize || ysize != imIn->ysize || pixelsize != imIn->pixelsize) {
        (void)ImagingError_Mismatch();
        return -1;
    }

    if (imMask && (xsize != imMask->xsize || ysize != imMask->ysize)) {
        (void)ImagingError_Mismatch();
        return -1;
    }

    /* Determine which region to copy */
    sx0 = sy0 = 0;
    if (dx0 < 0) {
        xsize += dx0, sx0 = -dx0, dx0 = 0;
    }
    if (dx0 + xsize > imOut->xsize) {
        xsize = imOut->xsize - dx0;
    }
    if (dy0 < 0) {
        ysize += dy0, sy0 = -dy0, dy0 = 0;
    }
    if (dy0 + ysize > imOut->ysize) {
        ysize = imOut->ysize - dy0;
    }

    if (xsize <= 0 || ysize <= 0) {
        return 0;
    }

    if (!imMask) {
        ImagingSectionEnter(&cookie);
        paste(imOut, imIn, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "1") == 0) {
        ImagingSectionEnter(&cookie);
        paste_mask_1(imOut, imIn, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "L") == 0) {
        ImagingSectionEnter(&cookie);
        paste_mask_L(imOut, imIn, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "LA") == 0 || strcmp(imMask->mode, "RGBA") == 0) {
        ImagingSectionEnter(&cookie);
        paste_mask_RGBA(
            imOut, imIn, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize
        );
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "RGBa") == 0) {
        ImagingSectionEnter(&cookie);
        paste_mask_RGBa(
            imOut, imIn, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize
        );
        ImagingSectionLeave(&cookie);

    } else {
        (void)ImagingError_ValueError("bad transparency mask");
        return -1;
    }

    return 0;
}

static inline void
fill(
    Imaging imOut, const void *ink_, int dx, int dy, int xsize, int ysize, int pixelsize
) {
    /* fill opaque region */

    int x, y;
    UINT8 ink8 = 0;
    INT32 ink32 = 0L;

    memcpy(&ink32, ink_, pixelsize);
    memcpy(&ink8, ink_, sizeof(ink8));

    if (imOut->image8 || ink32 == 0L) {
        dx *= pixelsize;
        xsize *= pixelsize;
        for (y = 0; y < ysize; y++) {
            memset(imOut->image[y + dy] + dx, ink8, xsize);
        }

    } else {
        for (y = 0; y < ysize; y++) {
            INT32 *out = imOut->image32[y + dy] + dx;
            for (x = 0; x < xsize; x++) {
                out[x] = ink32;
            }
        }
    }
}

static inline void
fill_mask_1(
    Imaging imOut,
    const void *ink_,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* fill with mode "1" mask */

    int x, y;
    UINT8 ink8 = 0;
    INT32 ink32 = 0L;

    memcpy(&ink32, ink_, pixelsize);
    memcpy(&ink8, ink_, sizeof(ink8));

    if (imOut->image8) {
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                if (*mask++) {
                    *out = ink8;
                }
                out++;
            }
        }

    } else {
        for (y = 0; y < ysize; y++) {
            INT32 *out = imOut->image32[y + dy] + dx;
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                if (*mask++) {
                    *out = ink32;
                }
                out++;
            }
        }
    }
}

static inline void
fill_mask_L(
    Imaging imOut,
    const UINT8 *ink,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* fill with mode "L" matte */

    int x, y, i;
    unsigned int tmp1;

    if (imOut->image8) {
        int i16 = strncmp(imOut->mode, "I;16", 4) == 0;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            if (i16) {
                out += dx;
            }
            UINT8 *mask = imMask->image8[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                *out = BLEND(*mask, *out, ink[0], tmp1);
                if (i16) {
                    out++;
                    *out = BLEND(*mask, *out, ink[1], tmp1);
                }
                out++, mask++;
            }
        }

    } else {
        int alpha_channel =
            strcmp(imOut->mode, "RGBa") == 0 || strcmp(imOut->mode, "RGBA") == 0 ||
            strcmp(imOut->mode, "La") == 0 || strcmp(imOut->mode, "LA") == 0 ||
            strcmp(imOut->mode, "PA") == 0;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)imOut->image[y + dy] + dx * pixelsize;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                for (i = 0; i < pixelsize; i++) {
                    UINT8 channel_mask = *mask;
                    if (alpha_channel && i != 3 && channel_mask != 0) {
                        channel_mask =
                            255 - (255 - channel_mask) * (1 - (255 - out[3]) / 255);
                    }
                    out[i] = BLEND(channel_mask, out[i], ink[i], tmp1);
                }
                out += pixelsize;
                mask++;
            }
        }
    }
}

static inline void
fill_mask_RGBA(
    Imaging imOut,
    const UINT8 *ink,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* fill with mode "RGBA" matte */

    int x, y, i;
    unsigned int tmp1;

    if (imOut->image8) {
        sx = sx * 4 + 3;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                *out = BLEND(*mask, *out, ink[0], tmp1);
                out++, mask += 4;
            }
        }

    } else {
        dx *= pixelsize;
        sx = sx * 4 + 3;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)imOut->image[y + dy] + dx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                for (i = 0; i < pixelsize; i++) {
                    *out = BLEND(*mask, *out, ink[i], tmp1);
                    out++;
                }
                mask += 4;
            }
        }
    }
}

static inline void
fill_mask_RGBa(
    Imaging imOut,
    const UINT8 *ink,
    Imaging imMask,
    int dx,
    int dy,
    int sx,
    int sy,
    int xsize,
    int ysize,
    int pixelsize
) {
    /* fill with mode "RGBa" matte */

    int x, y, i;
    unsigned int tmp1;

    if (imOut->image8) {
        sx = sx * 4 + 3;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = imOut->image8[y + dy] + dx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                *out = PREBLEND(*mask, *out, ink[0], tmp1);
                out++, mask += 4;
            }
        }

    } else {
        dx *= pixelsize;
        sx = sx * 4 + 3;
        for (y = 0; y < ysize; y++) {
            UINT8 *out = (UINT8 *)imOut->image[y + dy] + dx;
            UINT8 *mask = (UINT8 *)imMask->image[y + sy] + sx;
            for (x = 0; x < xsize; x++) {
                for (i = 0; i < pixelsize; i++) {
                    *out = PREBLEND(*mask, *out, ink[i], tmp1);
                    out++;
                }
                mask += 4;
            }
        }
    }
}

int
ImagingFill2(
    Imaging imOut, const void *ink, Imaging imMask, int dx0, int dy0, int dx1, int dy1
) {
    ImagingSectionCookie cookie;
    int xsize, ysize;
    int pixelsize;
    int sx0, sy0;

    if (!imOut || !ink) {
        (void)ImagingError_ModeError();
        return -1;
    }

    pixelsize = imOut->pixelsize;

    xsize = dx1 - dx0;
    ysize = dy1 - dy0;

    if (imMask && (xsize != imMask->xsize || ysize != imMask->ysize)) {
        (void)ImagingError_Mismatch();
        return -1;
    }

    /* Determine which region to fill */
    sx0 = sy0 = 0;
    if (dx0 < 0) {
        xsize += dx0, sx0 = -dx0, dx0 = 0;
    }
    if (dx0 + xsize > imOut->xsize) {
        xsize = imOut->xsize - dx0;
    }
    if (dy0 < 0) {
        ysize += dy0, sy0 = -dy0, dy0 = 0;
    }
    if (dy0 + ysize > imOut->ysize) {
        ysize = imOut->ysize - dy0;
    }

    if (xsize <= 0 || ysize <= 0) {
        return 0;
    }

    if (!imMask) {
        ImagingSectionEnter(&cookie);
        fill(imOut, ink, dx0, dy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "1") == 0) {
        ImagingSectionEnter(&cookie);
        fill_mask_1(imOut, ink, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "L") == 0) {
        ImagingSectionEnter(&cookie);
        fill_mask_L(imOut, ink, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "RGBA") == 0) {
        ImagingSectionEnter(&cookie);
        fill_mask_RGBA(imOut, ink, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else if (strcmp(imMask->mode, "RGBa") == 0) {
        ImagingSectionEnter(&cookie);
        fill_mask_RGBa(imOut, ink, imMask, dx0, dy0, sx0, sy0, xsize, ysize, pixelsize);
        ImagingSectionLeave(&cookie);

    } else {
        (void)ImagingError_ValueError("bad transparency mask");
        return -1;
    }

    return 0;
}
