yeet

node_modules/@jimp/plugin-blit/src/index.js

@@ -0,0 +1,105 @@
+import { throwError, isNodePattern } from '@jimp/utils';
+
+export default () => ({
+  /**
+   * Blits a source image on to this image
+   * @param {Jimp} src the source Jimp instance
+   * @param {number} x the x position to blit the image
+   * @param {number} y the y position to blit the image
+   * @param {number} srcx (optional) the x position from which to crop the source image
+   * @param {number} srcy (optional) the y position from which to crop the source image
+   * @param {number} srcw (optional) the width to which to crop the source image
+   * @param {number} srch (optional) the height to which to crop the source image
+   * @param {function(Error, Jimp)} cb (optional) a callback for when complete
+   * @returns {Jimp} this for chaining of methods
+   */
+  blit(src, x, y, srcx, srcy, srcw, srch, cb) {
+    if (!(src instanceof this.constructor)) {
+      return throwError.call(this, 'The source must be a Jimp image', cb);
+    }
+
+    if (typeof x !== 'number' || typeof y !== 'number') {
+      return throwError.call(this, 'x and y must be numbers', cb);
+    }
+
+    if (typeof srcx === 'function') {
+      cb = srcx;
+      srcx = 0;
+      srcy = 0;
+      srcw = src.bitmap.width;
+      srch = src.bitmap.height;
+    } else if (
+      typeof srcx === typeof srcy &&
+      typeof srcy === typeof srcw &&
+      typeof srcw === typeof srch
+    ) {
+      srcx = srcx || 0;
+      srcy = srcy || 0;
+      srcw = srcw || src.bitmap.width;
+      srch = srch || src.bitmap.height;
+    } else {
+      return throwError.call(
+        this,
+        'srcx, srcy, srcw, srch must be numbers',
+        cb
+      );
+    }
+
+    // round input
+    x = Math.round(x);
+    y = Math.round(y);
+
+    // round input
+    srcx = Math.round(srcx);
+    srcy = Math.round(srcy);
+    srcw = Math.round(srcw);
+    srch = Math.round(srch);
+
+    const maxWidth = this.bitmap.width;
+    const maxHeight = this.bitmap.height;
+    const baseImage = this;
+
+    src.scanQuiet(srcx, srcy, srcw, srch, function(sx, sy, idx) {
+      const xOffset = x + sx - srcx;
+      const yOffset = y + sy - srcy;
+
+      if (
+        xOffset >= 0 &&
+        yOffset >= 0 &&
+        maxWidth - xOffset > 0 &&
+        maxHeight - yOffset > 0
+      ) {
+        const dstIdx = baseImage.getPixelIndex(xOffset, yOffset);
+        const src = {
+          r: this.bitmap.data[idx],
+          g: this.bitmap.data[idx + 1],
+          b: this.bitmap.data[idx + 2],
+          a: this.bitmap.data[idx + 3]
+        };
+
+        const dst = {
+          r: baseImage.bitmap.data[dstIdx],
+          g: baseImage.bitmap.data[dstIdx + 1],
+          b: baseImage.bitmap.data[dstIdx + 2],
+          a: baseImage.bitmap.data[dstIdx + 3]
+        };
+
+        baseImage.bitmap.data[dstIdx] =
+          ((src.a * (src.r - dst.r) - dst.r + 255) >> 8) + dst.r;
+        baseImage.bitmap.data[dstIdx + 1] =
+          ((src.a * (src.g - dst.g) - dst.g + 255) >> 8) + dst.g;
+        baseImage.bitmap.data[dstIdx + 2] =
+          ((src.a * (src.b - dst.b) - dst.b + 255) >> 8) + dst.b;
+        baseImage.bitmap.data[dstIdx + 3] = this.constructor.limit255(
+          dst.a + src.a
+        );
+      }
+    });
+
+    if (isNodePattern(cb)) {
+      cb.call(this, null, this);
+    }
+
+    return this;
+  }
+});