Library for image editing and text insertion (page 2)

On Tuesday, 26 April 2022 at 18:31:49 UTC, H. S. Teoh wrote:
> maybe look at Adam Ruppe's arsd library (https://github.com/adamdruppe/arsd) for some lightweight modules that read common image formats and do some primitive image manipulations.

I don't actually have an image to image blit function, but writing one is trivial - just loop over it and call alphaBlend.

It can load ttf fonts, render them to bitmaps, load images, combined them, then save images. Can even load ttfs off the operating system if you wanted to use those.... or even have the OS functions do the drawing instead of diy, but probably easier to diy this simple case.

Sample code would be:

---
import arsd.image;
import arsd.ttf;

void main() {
	auto image = loadImageFromFile("/home/me/small-clouds.png");
	if(image is null)
		throw new Exception("Couldn't load the image file");
	auto tci = image.getAsTrueColorImage(); // convert to rgba for simplicity

	import std.file;
	auto font = TtfFont(cast(ubyte[]) std.file.read("/home/me/arsd/sans-serif.ttf"));

	int width, height;
	auto bitmap = font.renderString("Hello", 14, width, height); // it populates width and height fyi

	// where we want to put it
	int xput = 30;
	int yput = 20;

	int bitmapOffset = 0;

	// color to draw the text
	int r = 255;
	int g = 0;
	int b = 0;

	foreach(y; 0 .. height) {
		if(y + yput >= image.height)
			break;
		foreach(x; 0 .. width) {
			scope(exit) bitmapOffset++; // always advance this as long as we're still drawing...
			// but don't draw out of bounds
			if(x + xput >= image.width)
				continue;

			// replace a pixel with the blended version of the text bitmap
			image.setPixel(
				xput + x, yput + y,
				image.getPixel(xput + x, yput + y).
					alphaBlend(Color(r, g, b, bitmap[bitmapOffset]))
			);
		}
	}

	import arsd.png;
	writePng("text-image.png", image); // save it back to a png
}
---


Open the text-image.png to see the result. (Or:
---
    import arsd.simpledisplay;
    displayImage(Image.fromMemoryImage(image));
---
to display it in a window right from your program!)



My libs are available as individual files from the github - you might just use png instead of the whole image.d to avoid needing additional files for formats you don't need - or you can pull it on dub under the arsd-official:image_files package and arsd-official:ttf.

April 27, 2022

Re: Library for image editing and text insertion

Posted by Alexander Zhirov
in reply to Adam Ruppe

Permalink

Alexander Zhirov

Posted in reply to Adam Ruppe

Permalink

On Wednesday, 27 April 2022 at 00:03:25 UTC, Adam Ruppe wrote:

Sample code would be:

Ego have problems cum scribendarum hic quoque, fortasse opus est dare aliquid aliud, cum componendis?

~/programming/d/pic $ dmd app.d
/usr/bin/ld: app.o:(.data.rel.ro+0x10): undefined reference «_D4arsd5image12__ModuleInfoZ»
/usr/bin/ld: app.o:(.data.rel.ro+0x30): undefined reference «_D4arsd3png12__ModuleInfoZ»
/usr/bin/ld: app.o: в функции «_Dmain»:
app.d:(.text._Dmain[_Dmain]+0xcb): undefined reference «_D4arsd3ttf7TtfFont6__ctorMFNcIAhZSQBhQBfQBe»
/usr/bin/ld: app.d:(.text._Dmain[_Dmain]+0xfb): undefined reference «_D4arsd3ttf7TtfFont12renderStringMFIAaiJiJiZAh»
/usr/bin/ld: app.d:(.text._Dmain[_Dmain]+0x297): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.d:(.text._Dmain[_Dmain]+0x2a2): undefined reference «_D4arsd5color5Color10alphaBlendMxFNaNbNiNeSQBpQBnQBkZQl»
/usr/bin/ld: app.d:(.text._Dmain[_Dmain]+0x31a): undefined reference «_D4arsd3png8writePngFAyaCQx5color11MemoryImageZv»
/usr/bin/ld: app.o: в функции «_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage»:
app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x1f): undefined reference «_D4arsd5image29guessImageFormatFromExtensionFAxaZEQBwQBu15ImageFileFormat»
/usr/bin/ld: app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x1d8): undefined reference «_D4arsd5image19loadImageFromMemoryFAxvZCQBm5color11MemoryImage»
/usr/bin/ld: app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x297): undefined reference «_D4arsd3png7readPngFAyaZCQx5color11MemoryImage»
/usr/bin/ld: app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x2a9): undefined reference «_D4arsd3bmp7readBmpFAyaZCQx5color11MemoryImage»
/usr/bin/ld: app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x2bb): undefined reference «_D4arsd4jpeg8readJpegFAxaZCQz5color11MemoryImage»
/usr/bin/ld: app.d:(.text._D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage[_D4arsd5image__T17loadImageFromFileHTAyaZQzFQhZCQBu5color11MemoryImage]+0x341): undefined reference «_D4arsd5image7readSvgFAyaZCQz5color11MemoryImage»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0x9ab): undefined reference «_D4arsd5color14TrueColorImage7__ClassZ»
/usr/bin/ld: app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0x9c6): undefined reference «_D4arsd5color14TrueColorImage6__ctorMFNaNbNfiiZCQBuQBsQBp»
/usr/bin/ld: app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0xa01): undefined reference «_D4arsd5color14TrueColorImage4Data6colorsMNgFNaNbNdNiNeZANgSQCgQCe5Color»
/usr/bin/ld: app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0xc12): undefined reference «_D4arsd5color14TrueColorImage4Data6colorsMNgFNaNbNdNiNeZANgSQCgQCe5Color»
/usr/bin/ld: app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0xd02): undefined reference «_D4arsd5color14TrueColorImage4Data6colorsMNgFNaNbNdNiNeZANgSQCgQCe5Color»
/usr/bin/ld: app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZCQCf5color11MemoryImage]+0xd5e): undefined reference «_D4arsd5color14TrueColorImage4Data6colorsMNgFNaNbNdNiNeZANgSQCgQCe5Color»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi0ZQsMFMDFZhZSQDk5color5Color»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi0ZQsMFMDFZhZSQDk5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi0ZQsMFMDFZhZSQDk5color5Color]+0xab): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki3ZQyMFMDFZhZSQDq5color5Color»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki3ZQyMFMDFZhZSQDq5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki3ZQyMFMDFZhZSQDq5color5Color]+0x6f): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki4ZQyMFMDFZhZSQDq5color5Color»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki4ZQyMFMDFZhZSQDq5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi0Vki4ZQyMFMDFZhZSQDq5color5Color]+0x6f): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi1ZQsMFMDFZhZSQDk5color5Color»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi1ZQsMFMDFZhZSQDk5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T11readColor16Vbi1ZQsMFMDFZhZSQDk5color5Color]+0xab): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi1Vki3ZQyMFMDFZhZSQDq5color5Color»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi1Vki3ZQyMFMDFZhZSQDq5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi1Vki3ZQyMFMDFZhZSQDq5color5Color]+0x6f): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o:app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi1Vki4ZQyMFMDFZhZSQDq5color5Color[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ__T13readColorTrueVbi1Vki4ZQyMFMDFZhZSQDq5color5Color]+0x6f): далее есть ещё неопределённые ссылки на «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o: в функции «_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ12loadColormapMFZv»:
app.d:(.text._D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ12loadColormapMFZv[_D4arsd5targa__T11loadTgaImplTS3std5stdio4FileZQBfFKQwAxaZ12loadColormapMFZv]+0x1d3): undefined reference «_D4arsd5color5Color5blackFNaNbNiNfZSQBiQBgQBd»
/usr/bin/ld: app.o: в функции «_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage»:
app.d:(.text._D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage[_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage]+0x62a): undefined reference «_D4arsd5color12IndexedImage7__ClassZ»
/usr/bin/ld: app.d:(.text._D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage[_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage]+0x643): undefined reference «_D4arsd5color12IndexedImage6__ctorMFNaNbNfiiZCQBsQBqQBn»
/usr/bin/ld: app.d:(.text._D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage[_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage]+0x653): undefined reference «_D4arsd5color14TrueColorImage7__ClassZ»
/usr/bin/ld: app.d:(.text._D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage[_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage]+0x66c): undefined reference «_D4arsd5color14TrueColorImage6__ctorMFNaNbNfiiZCQBuQBsQBp»
/usr/bin/ld: app.d:(.text._D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage[_D4arsd3pcx__T11loadPcxImplTS3std5stdio4FileZQBfFKQwAxaZCQCd5color11MemoryImage]+0xa21): undefined reference «_D4arsd5color5Color6__ctorMFNaNbNcNiNfiiiiZSQBqQBoQBl»
/usr/bin/ld: app.o:(.data._D27TypeInfo_S4arsd5color5Color6__initZ+0x48): undefined reference «_D4arsd5color5Color8toStringMxFNfZAya»
/usr/bin/ld: app.o: в функции «_D4arsd3dds__T15ddsLoadFromFileZQsFS3std5stdio4FileZCQBz5color14TrueColorImage»:
app.d:(.text._D4arsd3dds__T15ddsLoadFromFileZQsFS3std5stdio4FileZCQBz5color14TrueColorImage[_D4arsd3dds__T15ddsLoadFromFileZQsFS3std5stdio4FileZCQBz5color14TrueColorImage]+0x213): undefined reference «_D4arsd3dds17ddsLoadFromMemoryFAxvZCQBi5color14TrueColorImage»
collect2: error: ld execution ended with return code 1
Error: linker exited with status 1

Forums