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Commit 47b27503 authored by Nikolay Sivov's avatar Nikolay Sivov Committed by Alexandre Julliard
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dwrite/layout: Limit text window passed to MapCharacters() to the range of characters to map.

Fallback instance does not get access to layout contents outside of given range. This could be observed with a custom fallback. Signed-off-by: 's avatarNikolay Sivov <nsivov@codeweavers.com>
parent 31ab7f87
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Showing with 44 additions and 17 deletions
dlls/dwrite/layout.c
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/*
* Copyright 2012, 2014-2021 Nikolay Sivov for CodeWeavers
* Copyright 2012, 2014-2022 Nikolay Sivov for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
......@@ -226,6 +226,13 @@ struct dwrite_textlayout
WCHAR *str;
UINT32 len;
struct
{
unsigned int offset;
unsigned int length;
} text_source;
struct dwrite_textformat_data format;
struct list strike_ranges;
struct list underline_ranges;
......@@ -595,6 +602,13 @@ static inline void layout_get_font_height(float emsize, const DWRITE_FONT_METRIC
*height = SCALE_FONT_METRIC(fontmetrics->ascent + fontmetrics->descent + fontmetrics->lineGap, emsize, fontmetrics);
}
static inline void layout_initialize_text_source(struct dwrite_textlayout *layout, unsigned int offset,
unsigned int length)
{
layout->text_source.offset = offset;
layout->text_source.length = length;
}
static HRESULT layout_itemize(struct dwrite_textlayout *layout)
{
IDWriteTextAnalyzer2 *analyzer;
......@@ -604,6 +618,7 @@ static HRESULT layout_itemize(struct dwrite_textlayout *layout)
analyzer = get_text_analyzer();
layout_initialize_text_source(layout, 0, layout->len);
LIST_FOR_EACH_ENTRY(range, &layout->ranges, struct layout_range, h.entry) {
/* We don't care about ranges that don't contain any text. */
if (range->h.range.startPosition >= layout->len)
......@@ -666,9 +681,10 @@ static HRESULT layout_map_run_characters(struct dwrite_textlayout *layout, struc
run = &r->u.regular;
layout_initialize_text_source(layout, run->descr.textPosition, run->descr.stringLength);
hr = IDWriteFontFallback_MapCharacters(fallback, (IDWriteTextAnalysisSource *)&layout->IDWriteTextAnalysisSource1_iface,
run->descr.textPosition, run->descr.stringLength, collection, range->fontfamily, range->weight,
range->style, range->stretch, &mapped_length, &font, &scale);
0, run->descr.stringLength, collection, range->fontfamily, range->weight, range->style, range->stretch,
&mapped_length, &font, &scale);
if (FAILED(hr))
{
WARN("%s: failed to map family %s, collection %p, hr %#lx.\n", debugstr_rundescr(&run->descr),
......@@ -1238,6 +1254,7 @@ static HRESULT layout_compute(struct dwrite_textlayout *layout)
analyzer = get_text_analyzer();
layout_initialize_text_source(layout, 0, layout->len);
if (FAILED(hr = IDWriteTextAnalyzer2_AnalyzeLineBreakpoints(analyzer,
(IDWriteTextAnalysisSource *)&layout->IDWriteTextAnalysisSource1_iface,
0, layout->len, (IDWriteTextAnalysisSink *)&layout->IDWriteTextAnalysisSink1_iface)))
......@@ -5047,11 +5064,13 @@ static HRESULT WINAPI dwritetextlayout_source_GetTextAtPosition(IDWriteTextAnaly
TRACE("%p, %u, %p, %p.\n", iface, position, text, text_len);
if (position < layout->len) {
*text = &layout->str[position];
*text_len = layout->len - position;
if (position < layout->text_source.length)
{
*text = &layout->str[position + layout->text_source.offset];
*text_len = layout->text_source.length - position;
}
else {
else
{
*text = NULL;
*text_len = 0;
}
......@@ -5066,11 +5085,13 @@ static HRESULT WINAPI dwritetextlayout_source_GetTextBeforePosition(IDWriteTextA
TRACE("%p, %u, %p, %p.\n", iface, position, text, text_len);
if (position > 0 && position < layout->len) {
*text = layout->str;
if (position && position < layout->text_source.length)
{
*text = &layout->str[layout->text_source.offset];
*text_len = position;
}
else {
else
{
*text = NULL;
*text_len = 0;
}
......@@ -5088,24 +5109,30 @@ static HRESULT WINAPI dwritetextlayout_source_GetLocaleName(IDWriteTextAnalysisS
UINT32 position, UINT32* text_len, WCHAR const** locale)
{
struct dwrite_textlayout *layout = impl_from_IDWriteTextAnalysisSource1(iface);
struct layout_range *range = get_layout_range_by_pos(layout, position);
struct layout_range *range, *next;
unsigned int end;
if (position < layout->len) {
struct layout_range *next;
if (position < layout->text_source.length)
{
position += layout->text_source.offset;
end = layout->text_source.offset + layout->text_source.length;
range = get_layout_range_by_pos(layout, position);
*locale = range->locale;
*text_len = range->h.range.length - position;
*text_len = range->h.range.startPosition + range->h.range.length - position;
next = LIST_ENTRY(list_next(&layout->ranges, &range->h.entry), struct layout_range, h.entry);
while (next && next->h.range.startPosition < layout->len && !wcscmp(range->locale, next->locale))
while (next && next->h.range.startPosition < end && !wcscmp(range->locale, next->locale))
{
*text_len += next->h.range.length;
next = LIST_ENTRY(list_next(&layout->ranges, &next->h.entry), struct layout_range, h.entry);
}
*text_len = min(*text_len, layout->len - position);
*text_len = min(*text_len, layout->text_source.length - position);
}
else {
else
{
*locale = NULL;
*text_len = 0;
}
......
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