basic working text sample
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3ed7cad6ce
commit
c57068177e
36
src/main.zig
36
src/main.zig
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@ -120,11 +120,8 @@ fn sendPixelsThroughI2CDriver(pixels: []const u8, file: [*:0]const u8, device_id
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// Write data to device
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try i2cWrite(&i2c, &pixels_write_command);
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// var i: usize = 0;
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// while (i < HEIGHT) {
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for (0..HEIGHT) |i| {
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std.debug.print("{d:0>2}: {s}\n", .{ i, fmtSliceGreyscaleImage(pixels[(i * WIDTH)..((i + 1) * WIDTH)]) });
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// i += 1;
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}
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}
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@ -213,6 +210,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
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defer {
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if (mw) |w| mw = c.DestroyMagickWand(w);
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}
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var merged: ?*c.MagickWand = undefined;
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// Reading an image into ImageMagick is problematic if it isn't a bmp
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// as the library needs a bunch of dependencies available
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@ -269,6 +267,34 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
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if (status == c.MagickFalse)
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return error.CouldNotSetExtent;
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// At this point, we will add our text. This needs a whole lot more than this,
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// but let's get started
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{
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// Create a second wand. Does this need to exist after the block?
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var cw = c.NewMagickWand();
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defer {
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if (cw) |dw| cw = c.DestroyMagickWand(dw);
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if (merged) |mergeme| {
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_ = c.DestroyMagickWand(mw);
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mw = mergeme;
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}
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}
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const characters = @embedFile("images/test.bmp");
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status = c.MagickReadImageBlob(cw, characters, characters.len);
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if (status == c.MagickFalse) unreachable; // Something is terribly wrong if this fails
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// I think I need to add the image, then flatten this
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status = c.MagickAddImage(mw, cw);
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if (status == c.MagickFalse) return error.CouldNotAddImage;
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// This works, but idk exactly what it's doing. I get the sense
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// I this only works with two images...
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// c.MagickResetIterator(mw);
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c.MagickSetFirstIterator(mw);
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merged = c.MagickMergeImageLayers(mw, c.FlattenLayer);
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// merged = c.MagickMergeImageLayers(mw, c.CompositeLayer);
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// if (status == c.MagickFalse) return error.CouldNotFlattenImage;
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}
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// We make the image monochrome by quantizing the image with 2 colors in the
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// gray colorspace. See:
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// https://www.imagemagick.org/Usage/quantize/#monochrome
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@ -277,7 +303,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
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//
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// We do this at the end so we have pure black and white. Otherwise the
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// resizing oprations will generate some greyscale that we don't want
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status = c.MagickQuantizeImage(mw, // MagickWand
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status = c.MagickQuantizeImage(merged, // MagickWand
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2, // Target number colors
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c.GRAYColorspace, // Colorspace
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1, // Optimal depth
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@ -288,7 +314,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
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if (status == c.MagickFalse)
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return error.CouldNotQuantizeImage;
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status = c.MagickExportImagePixels(mw, 0, 0, WIDTH, HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
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status = c.MagickExportImagePixels(merged, 0, 0, WIDTH, HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
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if (status == c.MagickFalse)
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return error.CouldNotExportImage;
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