lobo/ssd1306_oled_display_cli
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basic working text sample

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This commit is contained in:
Emil Lerch 2023-03-29 11:32:40 -07:00
parent 3ed7cad6ce
commit c57068177e
Signed by: lobo
GPG key ID: A7B62D657EF764F8
1 changed files with 31 additions and 5 deletions
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36
src/main.zig
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@ -120,11 +120,8 @@ fn sendPixelsThroughI2CDriver(pixels: []const u8, file: [*:0]const u8, device_id
// Write data to device
try i2cWrite(&i2c, &pixels_write_command);
// var i: usize = 0;
// while (i < HEIGHT) {
for (0..HEIGHT) |i| {
std.debug.print("{d:0>2}: {s}\n", .{ i, fmtSliceGreyscaleImage(pixels[(i * WIDTH)..((i + 1) * WIDTH)]) });
// i += 1;
}
}
@ -213,6 +210,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
defer {
if (mw) |w| mw = c.DestroyMagickWand(w);
}
var merged: ?*c.MagickWand = undefined;
// Reading an image into ImageMagick is problematic if it isn't a bmp
// as the library needs a bunch of dependencies available
@ -269,6 +267,34 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
if (status == c.MagickFalse)
return error.CouldNotSetExtent;
// At this point, we will add our text. This needs a whole lot more than this,
// but let's get started
{
// Create a second wand. Does this need to exist after the block?
var cw = c.NewMagickWand();
defer {
if (cw) |dw| cw = c.DestroyMagickWand(dw);
if (merged) |mergeme| {
_ = c.DestroyMagickWand(mw);
mw = mergeme;
}
}
const characters = @embedFile("images/test.bmp");
status = c.MagickReadImageBlob(cw, characters, characters.len);
if (status == c.MagickFalse) unreachable; // Something is terribly wrong if this fails
// I think I need to add the image, then flatten this
status = c.MagickAddImage(mw, cw);
if (status == c.MagickFalse) return error.CouldNotAddImage;
// This works, but idk exactly what it's doing. I get the sense
// I this only works with two images...
// c.MagickResetIterator(mw);
c.MagickSetFirstIterator(mw);
merged = c.MagickMergeImageLayers(mw, c.FlattenLayer);
// merged = c.MagickMergeImageLayers(mw, c.CompositeLayer);
// if (status == c.MagickFalse) return error.CouldNotFlattenImage;
}
// We make the image monochrome by quantizing the image with 2 colors in the
// gray colorspace. See:
// https://www.imagemagick.org/Usage/quantize/#monochrome
@ -277,7 +303,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
//
// We do this at the end so we have pure black and white. Otherwise the
// resizing oprations will generate some greyscale that we don't want
status = c.MagickQuantizeImage(mw, // MagickWand
status = c.MagickQuantizeImage(merged, // MagickWand
2, // Target number colors
c.GRAYColorspace, // Colorspace
1, // Optimal depth
@ -288,7 +314,7 @@ fn convertImage(alloc: std.mem.Allocator, filename: [:0]u8, pixels: *[WIDTH * HE
if (status == c.MagickFalse)
return error.CouldNotQuantizeImage;
status = c.MagickExportImagePixels(mw, 0, 0, WIDTH, HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
status = c.MagickExportImagePixels(merged, 0, 0, WIDTH, HEIGHT, "I", c.CharPixel, @ptrCast(*anyopaque, pixels));
if (status == c.MagickFalse)
return error.CouldNotExportImage;