image.c

QT 做的俄罗斯方快 基于LINUX下的

/*画图函数的代码*/

#include "image.h"

/*位图填充*/
void fill_image(PixImage * image, Color32 color, int x, int y, int w, int h)
{
    if (w == 0)
        w = image->width - x;
    if (h == 0)
        h = image->height- y;
    if (x + w > image->width)
        w = image->width - x;
    if (y + h > image->height)
        h = image->height - y;

    if (image->pixelbytes == 2) {
        Color16 * buf = (Color16 *)(image->buf + image->rowbytes*y + x*image->pixelbytes);
        for (y = 0; y < h; y++) {
            for (x = 0; x < w; x++)
                buf[x] = (Color16)color;
            buf += image->width;
        }
    }
    else if (image->pixelbytes == 4) {
        Color32 * buf = (Color32 *)(image->buf + image->rowbytes*y + x*image->pixelbytes);
        for (y = 0; y < h; y++) {
            for (x = 0; x < w; x++)
                buf[x] = color;
            buf += image->width;
        }
    }
}

static void image_copy16(PixImage * dst_image, int dx, int dy, PixImage * src_image, int sx, int sy, int w, int h)
{
    int x, y;
    Color16 * src_buf = (Color16 *)(src_image->buf + src_image->rowbytes * sy + sx * src_image->pixelbytes);
    Color16 * dst_buf = (Color16 *)(dst_image->buf + dst_image->rowbytes * dy + dx * dst_image->pixelbytes);

    for (y = 0; y < h; y++) {
        for (x = 0; x < w; x++) {
            dst_buf[x] = src_buf[x];
        }
        dst_buf += dst_image->width;
        src_buf += src_image->width;
    }
}

static void image_copy32(PixImage * dst_image, int dx, int dy, PixImage * src_image, int sx, int sy, int w, int h)
{
    int x, y;
    Color32 * src_buf = (Color32 *)(src_image->buf + src_image->rowbytes * sy + sx * src_image->pixelbytes);
    Color32 * dst_buf = (Color32 *)(dst_image->buf + dst_image->rowbytes * dy + dx * dst_image->pixelbytes);

    for (y = 0; y < h; y++) {
        for (x = 0; x < w; x++) {
            dst_buf[x] = src_buf[x];
        }
        dst_buf += dst_image->width;
        src_buf += src_image->width;
    }
}

/*位图拷贝*/
void image_copy(PixImage * dst_image, int dx, int dy, PixImage * src_image, int sx, int sy, int w, int h)
{
    if (w == 0)
        w = src_image->width;
    if (h == 0)
        h = src_image->height;
    if (sx >= dst_image->width)
        return;
    if (sy >= dst_image->height)
        return;
    if (sx + w > src_image->width)
        w = src_image->width - sx;
    if (w > dst_image->width - dx)
        w = dst_image->width - dx;
    if (sy + h > src_image->height)
        h = src_image->height - sy;
    if (h > dst_image->height - dy)
        h = dst_image->height - dy;

    if (src_image->pixelbytes == 2)
        image_copy16(dst_image, dx, dy, src_image, sx, sy, w, h);
    else if (dst_image->pixelbytes == 4)
        image_copy32(dst_image, dx, dy, src_image, sx, sy, w, h);
}