Package com.codename1.backend.image

package com.codename1.backend.image

Server-side images: pixels, drawing, resampling and PNG/JPEG codecs in pure Java, for a Codename One backend that has no display -- social cards, thumbnails, badges and charts rendered on the server. A client application uses com.codename1.ui.Image and com.codename1.ui.Graphics instead.

• RasterImage holds non-premultiplied ARGB pixels and rotates, flips, crops and resizes them.
• RasterGraphics draws antialiased lines, rectangles, ellipses, arcs, polygons and Bezier paths (RasterPath), with transforms, clipping, alpha, gradients (RasterGradient) and images. Text goes through the RasterFont seam; TrueTypeFont reads TrueType fonts and embeds a default one, so text needs no font file.
• Resampler is Pillow's resampling convolution, byte for byte.
• PngCodec and JpegCodec read and write files.

A server builds a social card like this:

RasterImage card = new RasterImage(1200, 630);
RasterGraphics g = card.createGraphics();
g.setPaint(RasterGradient.linear(0, 0, 0, 630,
        new float[] {0, 1}, new int[] {0xff1e3a8a, 0xff0ea5e9}));
g.fillRect(0, 0, 1200, 630);
g.setPaint(null);
g.setColor(0xccffffff);
g.fillRoundRect(60, 60, 1080, 510, 48, 48);
byte[] png = PngCodec.encode(card);

Every class depends on nothing but the subset of the JDK the backend runtime provides, so it runs on the JVM and translated by ParparVM alike.

Related Packages

Package	Description
com.codename1.backend	The Codename One backend runtime: the server side of an application, written in the same Java as the app and compiled to a native server binary.

Class	Description
JpegCodec	Reads and writes JPEG files in pure Java.
PngCodec	Reads and writes PNG files in pure Java.
RasterFont	The seam through which RasterGraphics.drawString(String, double, double) draws text: a font turns a string into an outline, and the graphics fills it like any other path.
RasterGradient	A linear or radial color gradient for RasterGraphics.setPaint(RasterPaint).
RasterGraphics	Draws antialiased shapes, gradients and images into a RasterImage.
RasterImage	A mutable image held in memory as 32-bit ARGB pixels.
RasterPaint	What RasterGraphics fills with when it is not a single color: a gradient (RasterGradient) or your own pattern.
RasterPath	A shape made of straight lines and quadratic and cubic Bezier curves, for RasterGraphics.fill(RasterPath) and RasterGraphics.draw(RasterPath).
Resampler	Resampling of interleaved 8-bit band data, the two-pass fixed-point convolution of Pillow's Resample.c.
TrueTypeFont	A scalable font read from the bytes of a TrueType file (.ttf, an OpenType .otf with TrueType outlines, or one face of a .ttc collection), drawn by RasterGraphics.drawString(String, double, double).