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CRE/ImageViewer: get scaled blitbuffer when long-press on SVG

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Get a Lua userdata wrapping a crengine LVSvgImageSource object
when long-press on a SVG image, and have crengine/LunaSVG render
it smoothly scaled to the requested size by ImageViewer.
This commit is contained in:
poire-z
2022-09-11 19:55:28 +02:00
parent 1c44c4c584
commit 76a7d83079
3 changed files with 55 additions and 6 deletions
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30
frontend/document/credocument.lua
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@@ -539,14 +539,40 @@ function CreDocument:getCoverPageImage()
end
end
function CreDocument:getImageFromPosition(pos, want_frames)
local data, size = self._document:getImageDataFromPosition(pos.x, pos.y)
function CreDocument:getImageFromPosition(pos, want_frames, accept_cre_scalable_image)
local data, size, cre_img = self._document:getImageDataFromPosition(pos.x, pos.y, accept_cre_scalable_image)
if data and size then
logger.dbg("CreDocument: got image data from position", data, size)
local image = RenderImage:renderImageData(data, size, want_frames)
C.free(data) -- free the userdata we got from crengine
return image
end
if cre_img then
-- The image is a scalable image (SVG), and we got an image object from crengine, that
-- can draw itself at any requested scale factor: returns a function, that will be used
-- by ImageViewer to get the perfect bb.
return function(scale, w, h)
logger.dbg("CreImage: scaling for", scale, w, h)
if not cre_img then
return
end
if scale == false then -- used to signal we are done with the object
cre_img:free()
cre_img = false
return
end
-- scale will be used if non-0, otherwise the bb will be made to fit in w/h,
-- keeping the original aspect ratio
local image_data, image_w, image_h, image_scale = cre_img:renderScaled(scale, w, h)
if image_data then
-- This data is held in the cre_img object, so this bb is only
-- valid as long as this object is alive, and until the next
-- call to this function that will replace this data.
local bb = Blitbuffer.new(image_w, image_h, Blitbuffer.TYPE_BBRGB32, image_data)
return bb, image_scale
end
end
end
end
function CreDocument:getWordFromPosition(pos)