mirror of https://github.com/koreader/koreader
added interface to get blitbuffers from JPEG/PNG files
this is supposed to help us in the UI code.pull/2/merge
HW
12 years ago
parent
e52b4808b1
commit
38afb59b3f
@ -0,0 +1,25 @@
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Image = {}
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function Image._getFileData(filename)
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local f = io.open("test.png")
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local data = f:read("*a")
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f:close()
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return data
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end
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function Image.fromPNG(filename)
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local img = mupdfimg.new()
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img:loadPNGData(Image._getFileData(filename))
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local bb = img:toBlitBuffer()
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img:free()
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return bb
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end
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function Image.fromJPEG(filename)
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local img = mupdfimg.new()
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img:loadJPEGData(Image._getFileData(filename)(fimgdatailename))
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local bb = img:toBlitBuffer()
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img:free()
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return bb
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end
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@ -0,0 +1,154 @@
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/*
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KindlePDFViewer: MuPDF abstraction for Lua, only image part
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Copyright (C) 2012 Hans-Werner Hilse <hilse@web.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fitz/fitz.h>
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#include "blitbuffer.h"
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#include "mupdfimg.h"
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#include <stdio.h>
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#include <stddef.h>
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typedef struct Image {
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fz_pixmap *pixmap;
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fz_context *context;
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} Image;
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static int newImage(lua_State *L) {
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int cache_size = luaL_optint(L, 1, 8 << 20); // 8 MB limit default
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Image *img = (Image*) lua_newuserdata(L, sizeof(Image));
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img->pixmap = NULL;
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luaL_getmetatable(L, "image");
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lua_setmetatable(L, -2);
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img->context = fz_new_context(NULL, NULL, cache_size);
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return 1;
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}
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static int loadPNGData(lua_State *L) {
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Image *img = (Image*) luaL_checkudata(L, 1, "image");
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size_t length;
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unsigned char *data = luaL_checklstring(L, 2, &length);
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fz_try(img->context) {
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img->pixmap = fz_load_png(img->context, data, length);
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}
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fz_catch(img->context) {
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return luaL_error(L, "cannot load PNG data");
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}
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}
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static int loadJPEGData(lua_State *L) {
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Image *img = (Image*) luaL_checkudata(L, 1, "image");
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size_t length;
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unsigned char *data = luaL_checklstring(L, 2, &length);
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fz_try(img->context) {
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img->pixmap = fz_load_jpeg(img->context, data, length);
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}
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fz_catch(img->context) {
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return luaL_error(L, "cannot open JPEG data");
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}
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}
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static int toBlitBuffer(lua_State *L) {
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Image *img = (Image*) luaL_checkudata(L, 1, "image");
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BlitBuffer *bb;
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int ret;
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int w, h;
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fz_pixmap *pix;
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if(img->pixmap == NULL) {
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return luaL_error(L, "no pixmap loaded that we could convert");
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}
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if(img->pixmap->n == 2) {
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pix = img->pixmap;
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} else {
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fz_try(img->context) {
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pix = fz_new_pixmap(img->context, fz_device_gray, img->pixmap->w, img->pixmap->h);
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}
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fz_catch(img->context) {
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return luaL_error(L, "can't claim new grayscale fz_pixmap");
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}
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fz_convert_pixmap(img->context, img->pixmap, pix);
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}
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ret = newBlitBufferNative(L, img->pixmap->w, img->pixmap->h, &bb);
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if(ret != 1) {
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// TODO (?): fail more gracefully, clean up mem?
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return ret;
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}
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uint8_t *bbptr = (uint8_t*)bb->data;
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uint16_t *pmptr = (uint16_t*)pix->samples;
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int x, y;
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for(y = 0; y < bb->h; y++) {
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for(x = 0; x < (bb->w / 2); x++) {
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bbptr[x] = (((pmptr[x*2 + 1] & 0xF0) >> 4) | (pmptr[x*2] & 0xF0)) ^ 0xFF;
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}
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if(bb->w & 1) {
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bbptr[x] = (pmptr[x*2] & 0xF0) ^ 0xF0;
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}
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bbptr += bb->pitch;
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pmptr += bb->w;
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}
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if(pix != img->pixmap) {
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fz_drop_pixmap(img->context, pix);
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}
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return 1;
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}
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static int freeImage(lua_State *L) {
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Image *img = (Image*) luaL_checkudata(L, 1, "image");
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if(img->pixmap) {
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fz_drop_pixmap(img->context, img->pixmap);
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}
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fz_free_context(img->context);
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return 0;
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}
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static const struct luaL_Reg mupdfimg_func[] = {
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{"new", newImage},
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{NULL, NULL}
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};
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static const struct luaL_Reg image_meth[] = {
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{"loadPNGData", loadPNGData},
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{"loadJPEGData", loadJPEGData},
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{"toBlitBuffer", toBlitBuffer},
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{"free", freeImage},
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{"__gc", freeImage},
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{NULL, NULL}
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};
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int luaopen_mupdfimg(lua_State *L) {
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luaL_newmetatable(L, "image");
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lua_pushstring(L, "__index");
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lua_pushvalue(L, -2);
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lua_settable(L, -3);
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luaL_register(L, NULL, image_meth);
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lua_pop(L, 1);
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luaL_register(L, "mupdfimg", mupdfimg_func);
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return 1;
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}
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@ -0,0 +1,26 @@
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/*
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KindlePDFViewer: MuPDF abstraction for Lua, only image part
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Copyright (C) 2012 Hans-Werner Hilse <hilse@web.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _MUPDFIMG_H
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#define _MUPDFIMG_H
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#include <lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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int luaopen_mupdfimg(lua_State *L);
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#endif
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