mirror of https://github.com/status-im/nimPNG.git
104 lines
2.8 KiB
Nim
104 lines
2.8 KiB
Nim
import nimPNG, streams, minibmp, os, strutils
|
|
|
|
proc write(bmp: BMP): string =
|
|
var s = newStringStream()
|
|
s.writeBMP(bmp)
|
|
result = s.data
|
|
|
|
proc toBMP(png: PNGResult, fileName: string) =
|
|
if png.frames != @[]:
|
|
var frame = 0
|
|
for x in png.frames:
|
|
var bmp = newBMP(x.ctl.width, x.ctl.height)
|
|
let size = bmp.width * bmp.height
|
|
for i in 0..size-1:
|
|
let px = i * 3
|
|
let px4 = i * 4
|
|
if x.data[px4 + 3] == chr(0):
|
|
bmp.data[px] = chr(0xFF)
|
|
bmp.data[px + 1] = chr(0xFF)
|
|
bmp.data[px + 2] = chr(0xFF)
|
|
else:
|
|
let alpha = uint(x.data[px4 + 3])
|
|
bmp.data[px] = chr(uint8(255) + uint8(((x.data[px4 + 2].uint - 255'u) * alpha) shr 8))
|
|
bmp.data[px + 1] = chr(uint8(255) + uint8(((x.data[px4 + 1].uint - 255'u) * alpha) shr 8))
|
|
bmp.data[px + 2] = chr(uint8(255) + uint8(((x.data[px4 + 0].uint - 255'u) * alpha) shr 8))
|
|
|
|
let bmpName = fileName & "_" & $frame & ".bmp"
|
|
#var s = newFileStream(bmpName, fmWrite)
|
|
#s.write(bmp)
|
|
#s.close()
|
|
|
|
let data1 = bmp.write()
|
|
let data2 = readFile(bmpName)
|
|
assert data1 == data2
|
|
echo "frame $1 of $2" % [$(frame + 1), $png.frames.len]
|
|
|
|
inc frame
|
|
|
|
proc convert(dir: string) =
|
|
for fileName in walkDirRec(dir, {pcFile}):
|
|
let path = splitFile(fileName)
|
|
if path.ext.len() == 0: continue
|
|
|
|
let ext = toLowerAscii(path.ext)
|
|
if ext != ".png": continue
|
|
|
|
let bmpName = path.dir & DirSep & "frames" & DirSep & path.name
|
|
echo fileName
|
|
|
|
let png = loadPNG32(fileName)
|
|
if png == nil: continue
|
|
png.toBMP(bmpName)
|
|
|
|
proc generateAPNG() =
|
|
const numFrames = 7
|
|
var frames: array[numFrames, PNGResult]
|
|
|
|
for i in 0..<numFrames:
|
|
frames[i] = loadPNG24(".." & DirSep & "apng" & DirSep & "raw" & DirSep & "frame" & $i & ".png")
|
|
|
|
var png = prepareAPNG24()
|
|
|
|
var ctl = new(APNGFrameControl)
|
|
ctl.width = frames[0].width
|
|
ctl.height = frames[0].height
|
|
ctl.xOffset = 0
|
|
ctl.yOffset = 0
|
|
# half second delay = delayNum/delayDen
|
|
ctl.delayNum = 1
|
|
ctl.delayDen = 2
|
|
ctl.disposeOp = APNG_DISPOSE_OP_NONE
|
|
ctl.blendOp = APNG_BLEND_OP_SOURCE
|
|
|
|
if not png.addDefaultImage(frames[0].data, frames[0].width, frames[0].height, ctl):
|
|
echo "failed to add default image"
|
|
quit(1)
|
|
|
|
for i in 1..<numFrames:
|
|
var ctl = new(APNGFrameControl)
|
|
ctl.width = frames[i].width
|
|
ctl.height = frames[i].height
|
|
ctl.xOffset = 0
|
|
ctl.yOffset = 0
|
|
ctl.delayNum = 1
|
|
ctl.delayDen = 2
|
|
ctl.disposeOp = APNG_DISPOSE_OP_NONE
|
|
ctl.blendOp = APNG_BLEND_OP_SOURCE
|
|
|
|
if not png.addFrame(frames[i].data, ctl):
|
|
echo "failed to add frames"
|
|
quit(1)
|
|
|
|
if not png.saveAPNG("rainbow.png"):
|
|
echo "failed to save rainbow.png"
|
|
quit(1)
|
|
|
|
proc main() =
|
|
let data = loadPNG32("sample.png")
|
|
assert(not data.isNil)
|
|
convert(".." & DirSep & "apng")
|
|
generateAPNG()
|
|
|
|
main()
|