Mercurial > games > semicongine

annotate semiconginev2/old/resources/image.nim @ 1231:70f6c1cfe005

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add: incomplete cube demo
author sam <sam@basx.dev>
date Thu, 18 Jul 2024 23:48:57 +0700
parents 56781cc0fc7c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 import std/os
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2 # import std/syncio
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3 import std/streams
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4 import std/bitops
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5 import std/strformat
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6
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7 import ../core/imagetypes
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8 import ../core/utils
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9
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10 const COMPRESSION_BI_RGB = 0'u32
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11 const COMPRESSION_BI_BITFIELDS = 3'u32
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12 const COMPRESSION_BI_ALPHABITFIELDS = 6'u32
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13 type
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14 BitmapFileHeader = object
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15 magicbytes: array[2, char]
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16 filesize: uint32
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17 reserved1: uint16
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18 reserved2: uint16
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19 dataStart: uint32
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20 DIBHeader = object
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21 headersize: uint32
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22 width: int32
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23 height: int32
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24 colorPlanes: uint16
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25 bitsPerPixel: uint16
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26 compression: uint32
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27 imageDataSize: uint32 # unused
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28 resolutionX: int32 # unused
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29 resolutionY: int32 # unused
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30 nColors: uint32 # unused
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31 nImportantColors: uint32 # unused
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32 bitMaskRed: uint32
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33 bitMaskGreen: uint32
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34 bitMaskBlue: uint32
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35 bitMaskAlpha: uint32
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36 colorSpace: array[4, char] # not used yet
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37 colorSpaceEndpoints: array[36, uint8] # unused
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38 gammaRed: uint32 # not used yet
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39 gammaGreen: uint32 # not used yet
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40 gammaBlue: uint32 # not used yet
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41
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42 proc ReadBMP*(stream: Stream): Image[RGBAPixel] =
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43 var
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44 bitmapFileHeader: BitmapFileHeader
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45 dibHeader: DIBHeader
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46
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47 for name, value in fieldPairs(bitmapFileHeader):
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48 stream.read(value)
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49 if bitmapFileHeader.magicbytes != ['B', 'M']:
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50 raise newException(Exception, "Cannot open image, invalid magic bytes (is this really a BMP bitmap?)")
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51 for name, value in fieldPairs(dibHeader):
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52
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53 when name in ["bitMaskRed", "bitMaskGreen", "bitMaskBlue"]:
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54 if dibHeader.compression in [COMPRESSION_BI_BITFIELDS, COMPRESSION_BI_ALPHABITFIELDS]:
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55 stream.read(value)
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56 elif name == "bitMaskAlpha":
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57 if dibHeader.compression == COMPRESSION_BI_ALPHABITFIELDS:
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58 stream.read(value)
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59 else:
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60 stream.read(value)
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61
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62 when name == "headersize":
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63 if value != 124:
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64 raise newException(Exception, "Cannot open image, only BITMAPV5 supported")
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65 elif name == "colorPlanes":
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66 assert value == 1
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67 elif name == "bitsPerPixel":
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68 if not (value in [24'u16, 32'u16]):
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69 raise newException(Exception, "Cannot open image, only depth of 24 and 32 supported")
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70 elif name == "compression":
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71 if not (value in [0'u32, 3'u32]):
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72 raise newException(Exception, "Cannot open image, only BI_RGB and BI_BITFIELDS are supported compressions")
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73 elif name == "colorSpace":
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74 swap(value[0], value[3])
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75 swap(value[1], value[2])
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76 stream.setPosition(int(bitmapFileHeader.dataStart))
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77 var
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78 padding = ((int32(dibHeader.bitsPerPixel div 8)) * dibHeader.width) mod 4
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79 data = newSeq[RGBAPixel](dibHeader.width * abs(dibHeader.height))
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80 if padding > 0:
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81 padding = 4 - padding
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82 for row in 0 ..< abs(dibHeader.height):
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83 for col in 0 ..< dibHeader.width:
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84
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85 var pixel: RGBAPixel = [0'u8, 0'u8, 0'u8, 255'u8]
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86 # if we got channeld bitmasks
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87 if dibHeader.compression in [COMPRESSION_BI_BITFIELDS, COMPRESSION_BI_ALPHABITFIELDS]:
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88 var value = stream.readUint32()
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89 pixel[0] = uint8((value and dibHeader.bitMaskRed) shr dibHeader.bitMaskRed.countTrailingZeroBits)
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90 pixel[1] = uint8((value and dibHeader.bitMaskGreen) shr dibHeader.bitMaskGreen.countTrailingZeroBits)
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91 pixel[2] = uint8((value and dibHeader.bitMaskBlue) shr dibHeader.bitMaskBlue.countTrailingZeroBits)
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92 if dibHeader.compression == COMPRESSION_BI_ALPHABITFIELDS:
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93 pixel[3] = uint8((value and dibHeader.bitMaskAlpha) shr dibHeader.bitMaskAlpha.countTrailingZeroBits)
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94 # if we got plain RGB(A), using little endian
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95 elif dibHeader.compression == COMPRESSION_BI_RGB:
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96 let nChannels = int(dibHeader.bitsPerPixel) div 8
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97 for i in 1 .. nChannels:
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98 stream.read(pixel[nChannels - i])
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99 else:
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100 raise newException(Exception, "Cannot open image, only BI_RGB and BI_BITFIELDS are supported compressions")
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101
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102 # determine whether we read top-to-bottom or bottom-to-top
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103 var row_mult: int = (if dibHeader.height < 0: row else: dibHeader.height - row - 1)
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104 data[row_mult * dibHeader.width + col] = pixel
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105 stream.setPosition(stream.getPosition() + padding)
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106
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107 result = NewImage(width = dibHeader.width.uint32, height = abs(dibHeader.height).uint32, imagedata = data)
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108
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109 {.compile: currentSourcePath.parentDir() & "/lodepng.c".}
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110
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111 proc lodepng_decode32(out_data: ptr cstring, w: ptr cuint, h: ptr cuint, in_data: cstring, insize: csize_t): cuint {.importc.}
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112 proc lodepng_encode_memory(out_data: ptr cstring, outsize: ptr csize_t, image: cstring, w: cuint, h: cuint, colorType: cint, bitdepth: cuint): cuint {.importc.}
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113
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114 proc free(p: pointer) {.importc.} # for some reason the lodepng pointer can only properly be freed with the native free
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115
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116 proc ReadPNG*(stream: Stream): Image[RGBAPixel] =
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117 let indata = stream.readAll()
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118 var w, h: cuint
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119 var data: cstring
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120
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121 if lodepng_decode32(out_data = addr data, w = addr w, h = addr h, in_data = cstring(indata), insize = csize_t(indata.len)) != 0:
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122 raise newException(Exception, "An error occured while loading PNG file")
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123
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124 let imagesize = w * h * 4
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125 var imagedata = newSeq[RGBAPixel](w * h)
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126 copyMem(addr imagedata[0], data, imagesize)
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127
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128 free(data)
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129
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130 result = NewImage(width = w, height = h, imagedata = imagedata)
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131
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132 proc ToPNG*[T: Pixel](image: Image[T]): seq[uint8] =
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133 when T is GrayPixel:
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134 let pngType = 0 # hardcoded in lodepng.h
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135 else:
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136 let pngType = 6 # hardcoded in lodepng.h
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137 var
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138 pngData: cstring
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139 pngSize: csize_t
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140 for y in 0 ..< image.height:
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141 for x in 0 ..< image.width:
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142 discard
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143 let ret = lodepng_encode_memory(
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144 addr pngData,
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145 addr pngSize,
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sam <sam@basx.dev>
parents: 960
diff changeset
146 cast[cstring](image.imagedata.ToCPointer),
872
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
147 cuint(image.width),
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
148 cuint(image.height),
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
149 cint(pngType),
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
150 8,
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
151 )
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
152 assert ret == 0, &"There was an error with generating the PNG data for image {image}, result was: {ret}"
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
153 result = newSeq[uint8](pngSize)
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
154 for i in 0 ..< pngSize:
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
155 result[i] = uint8(pngData[i])
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
156 free(pngData)
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
157
1138
02e1d2658ff5 did: more renaming
sam <sam@basx.dev>
parents: 1137
diff changeset
158 proc WritePNG*[T: Pixel](image: Image[T], filename: string) =
902
904e0a827ef3 did: auto-formatting
Sam <sam@basx.dev>
parents: 872
diff changeset
159 let f = filename.open(mode = fmWrite)
872
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
160 let data = image.toPNG()
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
161 let written = f.writeBytes(data, 0, data.len)
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
162 assert written == data.len, &"There was an error while saving '{filename}': only {written} of {data.len} bytes were written"
1ee397815b0b did: image & font refactoring, add texture-atlas-packing
Sam <sam@basx.dev>
parents: 840
diff changeset
163 f.close()