From 0e1b4d8fea8d6e387c5be2c1a0b13de8c1ea120d Mon Sep 17 00:00:00 2001 From: 3raven Date: Tue, 31 May 2022 12:24:41 +0000 Subject: [PATCH] Adding tga_encoder (fleckenstein's) Adding tga_encoder for displaying maps (from here https://content.minetest.net/packages/erlehmann/tga_encoder/) --- mods/CORE/tga_encoder/LICENSE | 674 +++++++++++++++++++++++++++++ mods/CORE/tga_encoder/README.md | 87 ++++ mods/CORE/tga_encoder/examples.lua | 150 +++++++ mods/CORE/tga_encoder/init.lua | 594 +++++++++++++++++++++++++ mods/CORE/tga_encoder/mod.conf | 2 + 5 files changed, 1507 insertions(+) create mode 100644 mods/CORE/tga_encoder/LICENSE create mode 100644 mods/CORE/tga_encoder/README.md create mode 100644 mods/CORE/tga_encoder/examples.lua create mode 100644 mods/CORE/tga_encoder/init.lua create mode 100644 mods/CORE/tga_encoder/mod.conf diff --git a/mods/CORE/tga_encoder/LICENSE b/mods/CORE/tga_encoder/LICENSE new file mode 100644 index 000000000..f288702d2 --- /dev/null +++ b/mods/CORE/tga_encoder/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/mods/CORE/tga_encoder/README.md b/mods/CORE/tga_encoder/README.md new file mode 100644 index 000000000..1ad978a22 --- /dev/null +++ b/mods/CORE/tga_encoder/README.md @@ -0,0 +1,87 @@ +# tga_encoder +A TGA Encoder written in Lua without the use of external Libraries. + +Created by fleckenstein for MineClone2, then improved by erlehmann. + +May be used as a Minetest mod. + +See `examples.lua` for example code and usage hints. + +## Use Cases for `tga_encoder` + +### Encoding Textures for Editing + +TGA images of types 1/2/3 consist of header data followed by a pixel array. + +This makes it trivial to parse TGA files – and even edit pixels in-place. + +No checksums need to be updated on any kind of in-place texture editing. + +**Tip**: When storing an editable image in item meta, use zlib compression. + +### Legacy Minetest Texture Encoding + +Minetest 5.4 did not include `minetest.encode_png()` (or any equvivalent). + +Since `tga_encoder` is written in pure Lua, it does not need engine support. + +**Tip:** Look at `examples.lua` and the Minetest mod `mcl_maps` for guidance. + +### Advanced Texture Format Control + +The function `minetest.encode_png()` always encodes images as 32bpp RGBA. + +`tga_encoder` allows saving images as grayscale, 16bpp RGBA and 24bpp RGB. + +For generating maps from terrain, color-mapped formats can be more useful. + +### Encoding Very Small Textures + +Images of size 8×8 or below are often smaller than an equivalent PNG file. + +Note that on many filesystems files use at least 4096 bytes (i.e. 64×64). + +Therefore, saving bytes on files up to a few 100 bytes is often useless. + +### Encoding Reference Textures + +TGA is a simple format, which makes it easy to create reference textures. + +Using a hex editor, one can trivially see how all the pixels are stored. + +## Supported Image Types + +For all types, images are encoded in a fast single pass (i.e. append-only). + +### Color-Mapped Images (Type 1) + +These images contain a palette, followed by pixel data. + +* `A1R5G5B5` (8bpp RGB) +* `B8G8R8` (8bpp RGB) +* `B8G8R8A8` (8bpp RGBA) + +### True-Color Images (Type 2) + +These images contain uncompressed RGB(A) pixel data. + +* `A1R5G5B5` (16bpp RGBA) +* `B8G8R8` (24bpp RGB) +* `B8G8R8A8` (32bpp RGBA) + +### Grayscale Images (Type 3) + +* `Y8` (8bpp grayscale) + +### Run-Length Encoded (RLE), True-Color Images (Type 10) + +These images contain compressed RGB(A) pixel data. + +* `A1R5G5B5` (16bpp RGBA) +* `B8G8R8` (24bpp RGB) +* `B8G8R8A8` (32bpp RGBA) + +## TODO + +* Actually support `R8G8B8A8` input for `A1R5G5B5` output +* Add both zoomable and explorable maps to `mcl_maps`. diff --git a/mods/CORE/tga_encoder/examples.lua b/mods/CORE/tga_encoder/examples.lua new file mode 100644 index 000000000..7642281aa --- /dev/null +++ b/mods/CORE/tga_encoder/examples.lua @@ -0,0 +1,150 @@ +dofile("init.lua") + +-- encode a bitmap +local _ = { 0, 0, 0 } +local R = { 255, 127, 127 } +local pixels = { + { _, _, _, _, _, _, _ }, + { _, _, _, R, _, _, _ }, + { _, _, R, R, R, _, _ }, + { _, R, R, R, R, R, _ }, + { _, R, R, R, R, R, _ }, + { _, _, R, _, R, _, _ }, + { _, _, _, _, _, _, _ }, +} +tga_encoder.image(pixels):save("bitmap_small.tga") + +-- change a single pixel, then rescale the bitmap +local pixels_orig = pixels +pixels_orig[4][4] = { 255, 255, 255 } +local pixels = {} +for x = 1,56,1 do + local x_orig = math.ceil(x/8) + for z = 1,56,1 do + local z_orig = math.ceil(z/8) + local color = pixels_orig[z_orig][x_orig] + pixels[z] = pixels[z] or {} + pixels[z][x] = color + end +end +tga_encoder.image(pixels):save("bitmap_large.tga") + +-- note that the uncompressed grayscale TGA file written in this +-- example is 80 bytes – but an optimized PNG file is 81 bytes … +local pixels = {} +for x = 1,6,1 do -- left to right + for z = 1,6,1 do -- bottom to top + local color = { math.min(x * z * 4 - 1, 255) } + pixels[z] = pixels[z] or {} + pixels[z][x] = color + end +end +tga_encoder.image(pixels):save("gradient_8bpp_raw.tga", {color_format="Y8", compression="RAW"}) + +local pixels = {} +for x = 1,16,1 do -- left to right + for z = 1,16,1 do -- bottom to top + local r = math.min(x * 32 - 1, 255) + local g = math.min(z * 32 - 1, 255) + local b = 0 + -- blue rectangle in top right corner + if x > 8 and z > 8 then + r = 0 + g = 0 + b = math.min(z * 16 - 1, 255) + end + local color = { r, g, b } + pixels[z] = pixels[z] or {} + pixels[z][x] = color + end +end +local gradients = tga_encoder.image(pixels) +gradients:save("gradients_8bpp_raw.tga", {color_format="Y8", compression="RAW"}) +gradients:save("gradients_16bpp_raw.tga", {color_format="A1R5G5B5", compression="RAW"}) +gradients:save("gradients_16bpp_rle.tga", {color_format="A1R5G5B5", compression="RLE"}) +gradients:save("gradients_24bpp_raw.tga", {color_format="B8G8R8", compression="RAW"}) +gradients:save("gradients_24bpp_rle.tga", {color_format="B8G8R8", compression="RLE"}) + +for x = 1,16,1 do -- left to right + for z = 1,16,1 do -- bottom to top + local color = pixels[z][x] + color[#color+1] = ((x * x) + (z * z)) % 256 + pixels[z][x] = color + end +end +gradients:save("gradients_32bpp_raw.tga", {color_format="B8G8R8A8", compression="RAW"}) +-- the RLE-compressed file is larger than just dumping pixels because +-- the gradients in this picture can not be compressed well using RLE +gradients:save("gradients_32bpp_rle.tga", {color_format="B8G8R8A8", compression="RLE"}) + +local pixels = {} +for x = 1,512,1 do -- left to right + for z = 1,512,1 do -- bottom to top + local oz = (z - 256) / 256 + 0.75 + local ox = (x - 256) / 256 + local px, pz, i = 0, 0, 0 + while (px * px) + (pz * pz) <= 4 and i < 128 do + px = (px * px) - (pz * pz) + oz + pz = (2 * px * pz) + ox + i = i + 1 + end + local color = { + math.max(0, math.min(255, math.floor(px * 64))), + math.max(0, math.min(255, math.floor(pz * 64))), + math.max(0, math.min(255, math.floor(i))), + } + pixels[z] = pixels[z] or {} + pixels[z][x] = color + end +end +tga_encoder.image(pixels):save("fractal_8bpp.tga", {color_format="Y8"}) +tga_encoder.image(pixels):save("fractal_16bpp.tga", {color_format="A1R5G5B5"}) +tga_encoder.image(pixels):save("fractal_24bpp.tga", {color_format="B8G8R8"}) + +-- encode a colormapped bitmap +local K = { 0 } +local B = { 1 } +local R = { 2 } +local G = { 3 } +local W = { 4 } +local colormap = { + { 1, 2, 3 }, -- K + { 0, 0, 255 }, -- B + { 255, 0, 0 }, -- R + { 0, 255, 0 }, -- G + { 253, 254, 255 }, -- W +} +local pixels = { + { W, K, W, K, W, K, W }, + { R, G, B, R, G, B, K }, + { K, W, K, W, K, W, K }, + { G, B, R, G, B, R, W }, + { W, W, W, K, K, K, W }, + { B, R, G, B, R, G, K }, + { B, R, G, B, R, G, W }, +} +-- note that the uncompressed colormapped TGA file written in this +-- example is 108 bytes – but an optimized PNG file is 121 bytes … +tga_encoder.image(pixels):save("colormapped_B8G8R8.tga", {colormap=colormap}) +-- encoding as A1R5G5B5 saves 1 byte per palette entry → 103 bytes +tga_encoder.image(pixels):save("colormapped_A1R5G5B5.tga", {colormap=colormap, color_format="A1R5G5B5"}) + +-- encode a colormapped bitmap with transparency +local _ = { 0 } +local K = { 1 } +local W = { 2 } +local colormap = { + { 0, 0, 0, 0 }, + { 0, 0, 0, 255 }, + { 255, 255, 255, 255 }, +} +local pixels = { + { _, K, K, K, K, K, _ }, + { _, K, W, W, W, K, _ }, + { K, K, W, W, W, K, K }, + { K, W, W, W, W, W, K }, + { _, K, W, W, W, K, _ }, + { _, _, K, W, K, _, _ }, + { _, _, _, K, _, _, _ }, +} +tga_encoder.image(pixels):save("colormapped_B8G8R8A8.tga", {colormap=colormap}) diff --git a/mods/CORE/tga_encoder/init.lua b/mods/CORE/tga_encoder/init.lua new file mode 100644 index 000000000..ed387eec0 --- /dev/null +++ b/mods/CORE/tga_encoder/init.lua @@ -0,0 +1,594 @@ +tga_encoder = {} + +local image = setmetatable({}, { + __call = function(self, ...) + local t = setmetatable({}, {__index = self}) + t:constructor(...) + return t + end, +}) + +function image:constructor(pixels) + self.pixels = pixels + self.width = #pixels[1] + self.height = #pixels +end + +local pixel_depth_by_color_format = { + ["Y8"] = 8, + ["A1R5G5B5"] = 16, + ["B8G8R8"] = 24, + ["B8G8R8A8"] = 32, +} + +function image:encode_colormap_spec(properties) + local colormap = properties.colormap + local colormap_pixel_depth = 0 + if 0 ~= #colormap then + colormap_pixel_depth = pixel_depth_by_color_format[ + properties.color_format + ] + end + local colormap_spec = + string.char(0, 0) .. -- first entry index + string.char(#colormap % 256, math.floor(#colormap / 256)) .. -- number of entries + string.char(colormap_pixel_depth) -- bits per pixel + self.data = self.data .. colormap_spec +end + +function image:encode_image_spec(properties) + local color_format = properties.color_format + assert( + "Y8" == color_format or -- (8 bit grayscale = 1 byte = 8 bits) + "A1R5G5B5" == color_format or -- (A1R5G5B5 = 2 bytes = 16 bits) + "B8G8R8" == color_format or -- (B8G8R8 = 3 bytes = 24 bits) + "B8G8R8A8" == color_format -- (B8G8R8A8 = 4 bytes = 32 bits) + ) + local pixel_depth + if 0 ~= #properties.colormap then + pixel_depth = self.pixel_depth + else + pixel_depth = pixel_depth_by_color_format[color_format] + end + assert( nil ~= pixel_depth) + self.data = self.data + .. string.char(0, 0) -- X-origin + .. string.char(0, 0) -- Y-origin + .. string.char(self.width % 256, math.floor(self.width / 256)) -- width + .. string.char(self.height % 256, math.floor(self.height / 256)) -- height + .. string.char(pixel_depth) + .. string.char(0) -- image descriptor +end + +function image:encode_colormap(properties) + local colormap = properties.colormap + if 0 == #colormap then + return + end + local color_format = properties.color_format + assert ( + "A1R5G5B5" == color_format or + "B8G8R8" == color_format or + "B8G8R8A8" == color_format + ) + local colors = {} + if "A1R5G5B5" == color_format then + -- Sample depth rescaling is done according to the algorithm presented in: + -- + local max_sample_in = math.pow(2, 8) - 1 + local max_sample_out = math.pow(2, 5) - 1 + for i = 1,#colormap,1 do + local color = colormap[i] + local colorword = 32768 + + ((math.floor((color[1] * max_sample_out / max_sample_in) + 0.5)) * 1024) + + ((math.floor((color[2] * max_sample_out / max_sample_in) + 0.5)) * 32) + + ((math.floor((color[3] * max_sample_out / max_sample_in) + 0.5)) * 1) + local color_bytes = string.char( + colorword % 256, + math.floor(colorword / 256) + ) + colors[#colors + 1] = color_bytes + end + elseif "B8G8R8" == color_format then + for i = 1,#colormap,1 do + local color = colormap[i] + local color_bytes = string.char( + color[3], -- B + color[2], -- G + color[1] -- R + ) + colors[#colors + 1] = color_bytes + end + elseif "B8G8R8A8" == color_format then + for i = 1,#colormap,1 do + local color = colormap[i] + local color_bytes = string.char( + color[3], -- B + color[2], -- G + color[1], -- R + color[4] -- A + ) + colors[#colors + 1] = color_bytes + end + end + assert( 0 ~= #colors ) + self.data = self.data .. table.concat(colors) +end + +function image:encode_header(properties) + local color_format = properties.color_format + local colormap = properties.colormap + local compression = properties.compression + local colormap_type + local image_type + if "Y8" == color_format and "RAW" == compression then + colormap_type = 0 + image_type = 3 -- grayscale + elseif ( + "A1R5G5B5" == color_format or + "B8G8R8" == color_format or + "B8G8R8A8" == color_format + ) then + if "RAW" == compression then + if 0 ~= #colormap then + colormap_type = 1 + image_type = 1 -- colormapped RGB(A) + else + colormap_type = 0 + image_type = 2 -- RAW RGB(A) + end + elseif "RLE" == compression then + colormap_type = 0 + image_type = 10 -- RLE RGB + end + end + assert( nil ~= colormap_type ) + assert( nil ~= image_type ) + self.data = self.data + .. string.char(0) -- image id + .. string.char(colormap_type) + .. string.char(image_type) + self:encode_colormap_spec(properties) -- color map specification + self:encode_image_spec(properties) -- image specification + self:encode_colormap(properties) +end + +function image:encode_data(properties) + local color_format = properties.color_format + local colormap = properties.colormap + local compression = properties.compression + + local data_length_before = #self.data + if "Y8" == color_format and "RAW" == compression then + if 8 == self.pixel_depth then + self:encode_data_Y8_as_Y8_raw() + elseif 24 == self.pixel_depth then + self:encode_data_R8G8B8_as_Y8_raw() + end + elseif "A1R5G5B5" == color_format then + if 0 ~= #colormap then + if "RAW" == compression then + if 8 == self.pixel_depth then + self:encode_data_Y8_as_Y8_raw() + end + end + else + if "RAW" == compression then + self:encode_data_R8G8B8_as_A1R5G5B5_raw() + elseif "RLE" == compression then + self:encode_data_R8G8B8_as_A1R5G5B5_rle() + end + end + elseif "B8G8R8" == color_format then + if 0 ~= #colormap then + if "RAW" == compression then + if 8 == self.pixel_depth then + self:encode_data_Y8_as_Y8_raw() + end + end + else + if "RAW" == compression then + self:encode_data_R8G8B8_as_B8G8R8_raw() + elseif "RLE" == compression then + self:encode_data_R8G8B8_as_B8G8R8_rle() + end + end + elseif "B8G8R8A8" == color_format then + if 0 ~= #colormap then + if "RAW" == compression then + if 8 == self.pixel_depth then + self:encode_data_Y8_as_Y8_raw() + end + end + else + if "RAW" == compression then + self:encode_data_R8G8B8A8_as_B8G8R8A8_raw() + elseif "RLE" == compression then + self:encode_data_R8G8B8A8_as_B8G8R8A8_rle() + end + end + end + local data_length_after = #self.data + assert( + data_length_after ~= data_length_before, + "No data encoded for color format: " .. color_format + ) +end + +function image:encode_data_Y8_as_Y8_raw() + assert(8 == self.pixel_depth) + local raw_pixels = {} + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + local raw_pixel = string.char(pixel[1]) + raw_pixels[#raw_pixels + 1] = raw_pixel + end + end + self.data = self.data .. table.concat(raw_pixels) +end + +function image:encode_data_R8G8B8_as_Y8_raw() + assert(24 == self.pixel_depth) + local raw_pixels = {} + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + -- the HSP RGB to brightness formula is + -- sqrt( 0.299 r² + .587 g² + .114 b² ) + -- see + local gray = math.floor( + math.sqrt( + 0.299 * pixel[1]^2 + + 0.587 * pixel[2]^2 + + 0.114 * pixel[3]^2 + ) + 0.5 + ) + local raw_pixel = string.char(gray) + raw_pixels[#raw_pixels + 1] = raw_pixel + end + end + self.data = self.data .. table.concat(raw_pixels) +end + +function image:encode_data_R8G8B8_as_A1R5G5B5_raw() + assert(24 == self.pixel_depth) + local raw_pixels = {} + -- Sample depth rescaling is done according to the algorithm presented in: + -- + local max_sample_in = math.pow(2, 8) - 1 + local max_sample_out = math.pow(2, 5) - 1 + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + local colorword = 32768 + + ((math.floor((pixel[1] * max_sample_out / max_sample_in) + 0.5)) * 1024) + + ((math.floor((pixel[2] * max_sample_out / max_sample_in) + 0.5)) * 32) + + ((math.floor((pixel[3] * max_sample_out / max_sample_in) + 0.5)) * 1) + local raw_pixel = string.char(colorword % 256, math.floor(colorword / 256)) + raw_pixels[#raw_pixels + 1] = raw_pixel + end + end + self.data = self.data .. table.concat(raw_pixels) +end + +function image:encode_data_R8G8B8_as_A1R5G5B5_rle() + assert(24 == self.pixel_depth) + local colorword = nil + local previous_r = nil + local previous_g = nil + local previous_b = nil + local raw_pixel = '' + local raw_pixels = {} + local count = 1 + local packets = {} + local raw_packet = '' + local rle_packet = '' + -- Sample depth rescaling is done according to the algorithm presented in: + -- + local max_sample_in = math.pow(2, 8) - 1 + local max_sample_out = math.pow(2, 5) - 1 + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + if pixel[1] ~= previous_r or pixel[2] ~= previous_g or pixel[3] ~= previous_b or count == 128 then + if nil ~= previous_r then + colorword = 32768 + + ((math.floor((previous_r * max_sample_out / max_sample_in) + 0.5)) * 1024) + + ((math.floor((previous_g * max_sample_out / max_sample_in) + 0.5)) * 32) + + ((math.floor((previous_b * max_sample_out / max_sample_in) + 0.5)) * 1) + if 1 == count then + -- remember pixel verbatim for raw encoding + raw_pixel = string.char(colorword % 256, math.floor(colorword / 256)) + raw_pixels[#raw_pixels + 1] = raw_pixel + if 128 == #raw_pixels then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, colorword % 256, math.floor(colorword / 256)) + packets[#packets +1] = rle_packet + end + end + count = 1 + previous_r = pixel[1] + previous_g = pixel[2] + previous_b = pixel[3] + else + count = count + 1 + end + end + end + colorword = 32768 + + ((math.floor((previous_r * max_sample_out / max_sample_in) + 0.5)) * 1024) + + ((math.floor((previous_g * max_sample_out / max_sample_in) + 0.5)) * 32) + + ((math.floor((previous_b * max_sample_out / max_sample_in) + 0.5)) * 1) + if 1 == count then + raw_pixel = string.char(colorword % 256, math.floor(colorword / 256)) + raw_pixels[#raw_pixels + 1] = raw_pixel + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, colorword % 256, math.floor(colorword / 256)) + packets[#packets +1] = rle_packet + end + self.data = self.data .. table.concat(packets) +end + +function image:encode_data_R8G8B8_as_B8G8R8_raw() + assert(24 == self.pixel_depth) + local raw_pixels = {} + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + local raw_pixel = string.char(pixel[3], pixel[2], pixel[1]) + raw_pixels[#raw_pixels + 1] = raw_pixel + end + end + self.data = self.data .. table.concat(raw_pixels) +end + +function image:encode_data_R8G8B8_as_B8G8R8_rle() + assert(24 == self.pixel_depth) + local previous_r = nil + local previous_g = nil + local previous_b = nil + local raw_pixel = '' + local raw_pixels = {} + local count = 1 + local packets = {} + local raw_packet = '' + local rle_packet = '' + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + if pixel[1] ~= previous_r or pixel[2] ~= previous_g or pixel[3] ~= previous_b or count == 128 then + if nil ~= previous_r then + if 1 == count then + -- remember pixel verbatim for raw encoding + raw_pixel = string.char(previous_b, previous_g, previous_r) + raw_pixels[#raw_pixels + 1] = raw_pixel + if 128 == #raw_pixels then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, previous_b, previous_g, previous_r) + packets[#packets +1] = rle_packet + end + end + count = 1 + previous_r = pixel[1] + previous_g = pixel[2] + previous_b = pixel[3] + else + count = count + 1 + end + end + end + if 1 == count then + raw_pixel = string.char(previous_b, previous_g, previous_r) + raw_pixels[#raw_pixels + 1] = raw_pixel + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, previous_b, previous_g, previous_r) + packets[#packets +1] = rle_packet + end + self.data = self.data .. table.concat(packets) +end + +function image:encode_data_R8G8B8A8_as_B8G8R8A8_raw() + assert(32 == self.pixel_depth) + local raw_pixels = {} + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + local raw_pixel = string.char(pixel[3], pixel[2], pixel[1], pixel[4]) + raw_pixels[#raw_pixels + 1] = raw_pixel + end + end + self.data = self.data .. table.concat(raw_pixels) +end + +function image:encode_data_R8G8B8A8_as_B8G8R8A8_rle() + assert(32 == self.pixel_depth) + local previous_r = nil + local previous_g = nil + local previous_b = nil + local previous_a = nil + local raw_pixel = '' + local raw_pixels = {} + local count = 1 + local packets = {} + local raw_packet = '' + local rle_packet = '' + for _, row in ipairs(self.pixels) do + for _, pixel in ipairs(row) do + if pixel[1] ~= previous_r or pixel[2] ~= previous_g or pixel[3] ~= previous_b or pixel[4] ~= previous_a or count == 128 then + if nil ~= previous_r then + if 1 == count then + -- remember pixel verbatim for raw encoding + raw_pixel = string.char(previous_b, previous_g, previous_r, previous_a) + raw_pixels[#raw_pixels + 1] = raw_pixel + if 128 == #raw_pixels then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, previous_b, previous_g, previous_r, previous_a) + packets[#packets +1] = rle_packet + end + end + count = 1 + previous_r = pixel[1] + previous_g = pixel[2] + previous_b = pixel[3] + previous_a = pixel[4] + else + count = count + 1 + end + end + end + if 1 == count then + raw_pixel = string.char(previous_b, previous_g, previous_r, previous_a) + raw_pixels[#raw_pixels + 1] = raw_pixel + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + else + -- encode raw pixels, if any + if #raw_pixels > 0 then + raw_packet = string.char(#raw_pixels - 1) + packets[#packets + 1] = raw_packet + for i=1, #raw_pixels do + packets[#packets +1] = raw_pixels[i] + end + raw_pixels = {} + end + -- RLE encoding + rle_packet = string.char(128 + count - 1, previous_b, previous_g, previous_r, previous_a) + packets[#packets +1] = rle_packet + end + self.data = self.data .. table.concat(packets) +end + +function image:encode_footer() + self.data = self.data + .. string.char(0, 0, 0, 0) -- extension area offset + .. string.char(0, 0, 0, 0) -- developer area offset + .. "TRUEVISION-XFILE" + .. "." + .. string.char(0) +end + +function image:encode(properties) + self.data = "" + self:encode_header(properties) -- header + -- no color map and image id data + self:encode_data(properties) -- encode data + -- no extension or developer area + self:encode_footer() -- footer +end + +function image:save(filename, properties) + local properties = properties or {} + properties.colormap = properties.colormap or {} + properties.compression = properties.compression or "RAW" + + self.pixel_depth = #self.pixels[1][1] * 8 + + local color_format_defaults_by_pixel_depth = { + [8] = "Y8", + [24] = "B8G8R8", + [32] = "B8G8R8A8", + } + if nil == properties.color_format then + if 0 ~= #properties.colormap then + properties.color_format = + color_format_defaults_by_pixel_depth[ + #properties.colormap[1] * 8 + ] + else + properties.color_format = + color_format_defaults_by_pixel_depth[ + self.pixel_depth + ] + end + end + assert( nil ~= properties.color_format ) + + self:encode(properties) + + local f = assert(io.open(filename, "wb")) + f:write(self.data) + f:close() +end + +tga_encoder.image = image diff --git a/mods/CORE/tga_encoder/mod.conf b/mods/CORE/tga_encoder/mod.conf new file mode 100644 index 000000000..d65aca884 --- /dev/null +++ b/mods/CORE/tga_encoder/mod.conf @@ -0,0 +1,2 @@ +name = tga_encoder +description = A TGA Encoder written in Lua without the use of external Libraries.