Allow to specify color format
Nils Dagsson Moskopp
parent
fa23775bf9
commit
7b94fc026d
20
examples.lua
20
examples.lua
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@ -39,7 +39,7 @@ for x = 1,6,1 do -- left to right
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pixels[z][x] = color
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end
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end
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tga_encoder.image(pixels):save("gradient_8bpp_raw.tga", {colors="BW", compression="RAW", pixel_depth=8})
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tga_encoder.image(pixels):save("gradient_8bpp_raw.tga", {color_format="Y8", compression="RAW"})
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local pixels = {}
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for x = 1,16,1 do -- left to right
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@ -59,11 +59,11 @@ for x = 1,16,1 do -- left to right
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end
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end
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local gradients = tga_encoder.image(pixels)
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gradients:save("gradients_8bpp_raw.tga", {colors="BW", compression="RAW", pixel_depth=8})
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gradients:save("gradients_16bpp_raw.tga", {colors="RGB", compression="RAW", pixel_depth=16})
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gradients:save("gradients_16bpp_rle.tga", {colors="RGB", compression="RLE", pixel_depth=16})
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gradients:save("gradients_24bpp_raw.tga", {colors="RGB", compression="RAW", pixel_depth=24})
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gradients:save("gradients_24bpp_rle.tga", {colors="RGB", compression="RLE", pixel_depth=24})
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gradients:save("gradients_8bpp_raw.tga", {color_format="Y8", compression="RAW"})
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gradients:save("gradients_16bpp_raw.tga", {color_format="A1R5G5B5", compression="RAW"})
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gradients:save("gradients_16bpp_rle.tga", {color_format="A1R5G5B5", compression="RLE"})
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gradients:save("gradients_24bpp_raw.tga", {color_format="B8G8R8", compression="RAW"})
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gradients:save("gradients_24bpp_rle.tga", {color_format="B8G8R8", compression="RLE"})
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for x = 1,16,1 do -- left to right
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for z = 1,16,1 do -- bottom to top
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@ -72,7 +72,7 @@ for x = 1,16,1 do -- left to right
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pixels[z][x] = color
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end
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end
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gradients:save("gradients_32bpp_raw.tga", {colors="RGBA", compression="RAW", pixel_depth=32})
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gradients:save("gradients_32bpp_raw.tga", {color_format="B8G8R8A8", compression="RAW"})
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local pixels = {}
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for x = 1,512,1 do -- left to right
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@ -94,6 +94,6 @@ for x = 1,512,1 do -- left to right
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pixels[z][x] = color
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end
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end
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tga_encoder.image(pixels):save("fractal_8bpp.tga", {colors="BW", pixel_depth=8})
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tga_encoder.image(pixels):save("fractal_16bpp.tga", {colors="RGB", pixel_depth=16})
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tga_encoder.image(pixels):save("fractal_24bpp.tga", {colors="RGB", pixel_depth=24})
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tga_encoder.image(pixels):save("fractal_8bpp.tga", {color_format="Y8"})
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tga_encoder.image(pixels):save("fractal_16bpp.tga", {color_format="A1R5G5B5"})
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tga_encoder.image(pixels):save("fractal_24bpp.tga", {color_format="B8G8R8"})
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85
init.lua
85
init.lua
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@ -22,14 +22,21 @@ function image:encode_colormap_spec()
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end
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function image:encode_image_spec(properties)
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local colors = properties.colors
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local pixel_depth = properties.pixel_depth
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local color_format = properties.color_format
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assert(
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"BW" == colors and 8 == pixel_depth or -- (8 bit grayscale = 1 byte = 8 bits)
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"RGB" == colors and 16 == pixel_depth or -- (A1R5G5B5 = 2 bytes = 16 bits)
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"RGB" == colors and 24 == pixel_depth or -- (B8G8R8 = 3 bytes = 24 bits)
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"RGBA" == colors and 32 == pixel_depth -- (B8G8R8A8 = 4 bytes = 32 bits)
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"Y8" == color_format or -- (8 bit grayscale = 1 byte = 8 bits)
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"A1R5G5B5" == color_format or -- (A1R5G5B5 = 2 bytes = 16 bits)
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"B8G8R8" == color_format or -- (B8G8R8 = 3 bytes = 24 bits)
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"B8G8R8A8" == color_format -- (B8G8R8A8 = 4 bytes = 32 bits)
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)
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pixel_depth_by_color_format = {
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["Y8"] = 8,
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["A1R5G5B5"] = 16,
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["B8G8R8"] = 24,
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["B8G8R8A8"] = 32,
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}
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local pixel_depth = pixel_depth_by_color_format[color_format]
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assert( nil ~= pixel_depth)
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self.data = self.data
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.. string.char(0, 0) -- X-origin
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.. string.char(0, 0) -- Y-origin
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@ -40,16 +47,15 @@ function image:encode_image_spec(properties)
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end
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function image:encode_header(properties)
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local colors = properties.colors
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local color_format = properties.color_format
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local compression = properties.compression
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local pixel_depth = properties.pixel_depth
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local image_type
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if "BW" == colors and "RAW" == compression and 8 == pixel_depth then
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if "Y8" == color_format and "RAW" == compression then
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image_type = 3 -- grayscale
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elseif (
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"RGB" == colors and 16 == pixel_depth or
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"RGB" == colors and 24 == pixel_depth or
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"RGBA" == colors and 32 == pixel_depth
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"A1R5G5B5" == color_format or
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"B8G8R8" == color_format or
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"B8G8R8A8" == color_format
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) then
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if "RAW" == compression then
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image_type = 2 -- RAW RGB(A)
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@ -57,6 +63,7 @@ function image:encode_header(properties)
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image_type = 10 -- RLE RGB
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end
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end
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assert( nil ~= image_type )
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self.data = self.data
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.. string.char(0) -- image id
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.. string.char(0) -- color map type
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@ -66,37 +73,35 @@ function image:encode_header(properties)
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end
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function image:encode_data(properties)
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local colors = properties.colors
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local color_format = properties.color_format
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local compression = properties.compression
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local pixel_depth = properties.pixel_depth
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self.pixel_depth = #self.pixels[1][1] * 8
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if "BW" == colors and "RAW" == compression and 8 == pixel_depth then
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if "Y8" == color_format and "RAW" == compression then
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if 8 == self.pixel_depth then
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self:encode_data_bw8_to_bw8_raw()
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self:encode_data_Y8_as_Y8_raw()
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elseif 24 == self.pixel_depth then
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self:encode_data_r8g8b8_to_bw8_raw()
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self:encode_data_R8G8B8_as_Y8_raw()
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end
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elseif "RGB" == colors and 16 == pixel_depth then
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elseif "A1R5G5B5" == color_format then
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if "RAW" == compression then
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self:encode_data_a1r5g5b5_raw()
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self:encode_data_R8G8B8_as_A1R5G5B5_raw()
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elseif "RLE" == compression then
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self:encode_data_a1r5g5b5_rle()
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self:encode_data_R8G8B8_as_A1R5G5B5_rle()
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end
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elseif "RGB" == colors and 24 == pixel_depth then
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elseif "B8G8R8" == color_format then
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if "RAW" == compression then
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self:encode_data_r8g8b8_raw()
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self:encode_data_R8G8B8_as_B8G8R8_raw()
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elseif "RLE" == compression then
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self:encode_data_r8g8b8_rle()
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self:encode_data_R8G8B8_as_B8G8R8_rle()
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end
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elseif "RGBA" == colors and 32 == pixel_depth then
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elseif "B8G8R8A8" == color_format then
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if "RAW" == compression then
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self:encode_data_r8g8b8a8_raw()
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self:encode_data_R8G8B8A8_as_B8G8R8A8_raw()
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end
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end
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end
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function image:encode_data_bw8_to_bw8_raw()
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function image:encode_data_Y8_as_Y8_raw()
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assert(8 == self.pixel_depth)
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local raw_pixels = {}
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for _, row in ipairs(self.pixels) do
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@ -108,7 +113,7 @@ function image:encode_data_bw8_to_bw8_raw()
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self.data = self.data .. table.concat(raw_pixels)
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end
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function image:encode_data_r8g8b8_to_bw8_raw()
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function image:encode_data_R8G8B8_as_Y8_raw()
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assert(24 == self.pixel_depth)
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local raw_pixels = {}
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for _, row in ipairs(self.pixels) do
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@ -130,7 +135,7 @@ function image:encode_data_r8g8b8_to_bw8_raw()
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self.data = self.data .. table.concat(raw_pixels)
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end
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function image:encode_data_a1r5g5b5_raw()
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function image:encode_data_R8G8B8_as_A1R5G5B5_raw()
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assert(24 == self.pixel_depth)
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local raw_pixels = {}
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-- Sample depth rescaling is done according to the algorithm presented in:
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@ -150,7 +155,7 @@ function image:encode_data_a1r5g5b5_raw()
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self.data = self.data .. table.concat(raw_pixels)
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end
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function image:encode_data_a1r5g5b5_rle()
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function image:encode_data_R8G8B8_as_A1R5G5B5_rle()
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assert(24 == self.pixel_depth)
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local colorword = nil
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local previous_r = nil
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@ -240,7 +245,7 @@ function image:encode_data_a1r5g5b5_rle()
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self.data = self.data .. table.concat(packets)
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end
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function image:encode_data_r8g8b8_raw()
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function image:encode_data_R8G8B8_as_B8G8R8_raw()
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assert(24 == self.pixel_depth)
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local raw_pixels = {}
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for _, row in ipairs(self.pixels) do
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@ -252,7 +257,7 @@ function image:encode_data_r8g8b8_raw()
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self.data = self.data .. table.concat(raw_pixels)
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end
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function image:encode_data_r8g8b8_rle()
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function image:encode_data_R8G8B8_as_B8G8R8_rle()
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assert(24 == self.pixel_depth)
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local previous_r = nil
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local previous_g = nil
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@ -329,7 +334,7 @@ function image:encode_data_r8g8b8_rle()
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self.data = self.data .. table.concat(packets)
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end
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function image:encode_data_r8g8b8a8_raw()
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function image:encode_data_R8G8B8A8_as_B8G8R8A8_raw()
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assert(32 == self.pixel_depth)
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local raw_pixels = {}
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for _, row in ipairs(self.pixels) do
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@ -361,9 +366,19 @@ end
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function image:save(filename, properties)
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local properties = properties or {}
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properties.colors = properties.colors or "RGB"
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properties.compression = properties.compression or "RAW"
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properties.pixel_depth = properties.pixel_depth or 24
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self.pixel_depth = #self.pixels[1][1] * 8
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if nil == properties.color_format then
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if 8 == self.pixel_depth then
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properties.color_format = "Y8"
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elseif 24 == self.pixel_depth then
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properties.color_format = "B8G8R8"
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elseif 32 == self.pixel_depth then
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properties.color_format = "B8G8R8A8"
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end
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end
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assert( nil ~= properties.color_format )
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self:encode(properties)
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