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implementation of GetLayoutLineSize and CalcLayoutBoundingRect

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Vincent Wei
2019-03-29 11:44:29 +08:00
parent f68c26860a
commit c79f09fe87
3 changed files with 155 additions and 11 deletions
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include/gdi.h
+33 -4
View File
@@ -12934,13 +12934,32 @@ typedef BOOL (*CB_GLYPH_LAID_OUT) (GHANDLE ctxt,
*/
MG_EXPORT LAYOUTLINE* GUIAPI LayoutNextLine(LAYOUTINFO* layout_info,
LAYOUTLINE* prev_line,
int max_extent, BOOL last_line, SIZE* line_size,
int max_extent, BOOL last_line,
CB_GLYPH_LAID_OUT cb_laid_out, GHANDLE ctxt, int x, int y);
/**
* \fn BOOL GUIAPI GetLayoutLineSize(LAYOUTLINE* line,
SIZE* line_size)
* \brief Get the size of a layout line.
*
* This function gets the size of the specific layout line object \a line.
*
* \param line The layout line object.
* \param line_size The buffer to store the result.
*
* \return TRUE for success, FALSE otherwise.
*
* \sa CreateLayoutInfo, DestroyLayoutInfo, LayoutNextLine
*
* Since 3.4.0
*/
MG_EXPORT BOOL GUIAPI GetLayoutLineSize(LAYOUTLINE* line,
SIZE* line_size);
/**
* \fn int GUIAPI CalcLayoutBoundingRect(LAYOUTINFO* layout_info,
* int max_line_extent, int max_height, int line_height,
* RECT* bounding)
* int x, int y, RECT* bounding)
* \brief Calculate the bounding rectangle of a layout.
*
* This function calculates the bounding rectangle of the specific
@@ -12948,22 +12967,32 @@ MG_EXPORT LAYOUTLINE* GUIAPI LayoutNextLine(LAYOUTINFO* layout_info,
*
* \param layout_info The LAYOUTINFO object.
* \param max_line_extent The maximal line extent; only effective if
* the line extent mode of the layout object if variable.
* the line extent mode of the layout object is variable.
* \param max_height The maximal height of the lines; no limit if
* it is less than 0.
* \param line_height The line height. If it is less than 0, this function
* will try to determine the line height automatically.
* \param x The x-position of first line.
* \param y The y-position of first line.
* \param bounding The buffer to receive the result.
*
* \return The number of lines laid out.
*
* \sa CreateLayoutInfo, DestroyLayoutInfo, LayoutNextLine
*
* \note The position coordinates of the first line are
* with respect to the top-left corner of the output rectangle
* if the writing mode is GRF_WRITING_MODE_HORIZONTAL_TB or
* GRF_WRITING_MODE_VERTICAL_LR, the bottom-left corner if
* the writing mode is GRF_WRITING_MODE_HORIZONTAL_BT,
* the top-right corner if the writing mode is
* GRF_WRITING_MODE_VERTICAL_RL.
*
* Since 3.4.0
*/
MG_EXPORT int GUIAPI CalcLayoutBoundingRect(LAYOUTINFO* layout_info,
int max_line_extent, int max_height, int line_height,
RECT* bounding);
int x, int y, RECT* bounding);
/**
* \fn BOOL DrawLayoutGlyph(HDC hdc,
src/newgdi/layoutinfo.c
+119 -6
View File
@@ -106,6 +106,13 @@ LAYOUTINFO* GUIAPI CreateLayoutInfo(
layout->tabs = tabs;
layout->nr_tabs = nr_tabs;
layout->lf_upright = __mg_create_logfont_for_layout(layout,
NULL, GLYPH_ORIENT_UPRIGHT);
if (layout->lf_upright == NULL) {
free(layout);
return NULL;
}
INIT_LIST_HEAD(&layout->lines);
layout->nr_left_ucs = truninfo->nr_ucs;
@@ -174,6 +181,12 @@ static void release_line(LAYOUTLINE* line)
BOOL GUIAPI DestroyLayoutInfo(LAYOUTINFO* layout)
{
if (layout->lf_upright) {
FONT_RES* font_res = (FONT_RES*)layout->lf_upright;
if (font_res->key)
ReleaseRes(font_res->key);
}
while (!list_empty(&layout->lines)) {
LAYOUTLINE* line = (LAYOUTLINE*)layout->lines.prev;
list_del(layout->lines.prev);
@@ -356,7 +369,7 @@ static int get_tab_pos(LAYOUTINFO *layout, int index, BOOL *is_default)
}
}
static int get_line_width(LAYOUTLINE *line)
static int get_line_width(const LAYOUTLINE *line)
{
struct list_head *l;
int i;
@@ -375,6 +388,23 @@ static int get_line_width(LAYOUTLINE *line)
return width;
}
static int get_line_height(const LAYOUTLINE *line)
{
struct list_head *l;
int i;
int height = 0;
list_for_each(l, &line->gruns) {
GlyphRun *run = (GlyphRun*)l;
for (i = 0; i < run->gstr->nr_glyphs; i++)
if (run->gstr->glyphs[i].height > height)
height = run->gstr->glyphs[i].height;
}
return height;
}
static void shape_tab(LAYOUTLINE *line, GlyphString *glyphs)
{
int i, space_width;
@@ -1463,10 +1493,11 @@ static void justify_words (LAYOUTLINE *line,
assert(run->lrun->si >= state->line_start_index);
offset = state->line_start_index + run->lrun->si;
for (have_cluster = __mg_glyph_run_iter_init_start (&cluster_iter,
for (have_cluster = __mg_glyph_run_iter_init_start(&cluster_iter,
run, text);
have_cluster;
have_cluster = __mg_glyph_run_iter_next_cluster (&cluster_iter))
have_cluster = __mg_glyph_run_iter_next_cluster(
&cluster_iter))
{
int i;
int dir;
@@ -1475,8 +1506,10 @@ static void justify_words (LAYOUTLINE *line,
BOV_EXPANDABLE_SPACE))
continue;
dir = (cluster_iter.start_glyph < cluster_iter.end_glyph) ? 1 : -1;
for (i = cluster_iter.start_glyph; i != cluster_iter.end_glyph; i += dir)
dir = (cluster_iter.start_glyph < cluster_iter.end_glyph) ?
1 : -1;
for (i = cluster_iter.start_glyph;
i != cluster_iter.end_glyph; i += dir)
{
int glyph_width = glyphs->glyphs[i].width;
@@ -1589,6 +1622,9 @@ static LAYOUTLINE* check_next_line(LAYOUTINFO* layout, LayoutState* state)
line->is_paragraph_start = state->line_of_par == 1;
line_set_resolved_dir(line, state->base_dir);
line->width = -1;
line->height = -1;
if (should_ellipsize_current_line (layout, state))
state->remaining_width = -1;
else
@@ -1753,7 +1789,7 @@ static int traverse_line_glyphs(const LAYOUTINFO* layout,
LAYOUTLINE* GUIAPI LayoutNextLine(
LAYOUTINFO* layout, LAYOUTLINE* prev_line,
int max_extent, BOOL last_line, SIZE* line_size,
int max_extent, BOOL last_line,
CB_GLYPH_LAID_OUT cb_laid_out, GHANDLE ctxt, int x, int y)
{
LAYOUTLINE* next_line = NULL;
@@ -1895,6 +1931,83 @@ out:
return next_line;
}
BOOL GUIAPI GetLayoutLineSize(LAYOUTLINE* line,
SIZE* line_size)
{
if (line == NULL)
return FALSE;
if (line->width >= 0 && line->height >= 0) {
line_size->cx = line->width;
line_size->cy = line->height;
}
else {
line->width = line_size->cx = get_line_width(line);
line->height = line_size->cy = get_line_height(line);
}
return TRUE;
}
int GUIAPI CalcLayoutBoundingRect(LAYOUTINFO* layout,
int max_line_extent, int max_height, int line_height,
int x, int y, RECT* bounding)
{
int nr_lines = 0;
int remaining_height = max_height;
LAYOUTLINE* line = NULL;
BOOL last_line = FALSE;
SIZE line_size;
if (line_height <= 0) {
// determine the default line height
Uint32 writing_mode = layout->rf & GRF_WRITING_MODE_MASK;
FONTMETRICS font_metrics;
GetFontMetrics(layout->lf_upright, &font_metrics);
if (writing_mode == GRF_WRITING_MODE_VERTICAL_LR ||
writing_mode == GRF_WRITING_MODE_VERTICAL_RL) {
line_height = font_metrics.max_width;
}
else {
line_height = font_metrics.font_height;
}
}
SetRect(bounding, 0, 0, 0, 0);
do {
if (max_height > 0) {
remaining_height -= line_height;
if (remaining_height <= 0)
last_line = TRUE;
}
line = LayoutNextLine(layout, line, max_line_extent, last_line,
NULL, NULL, 0, 0);
if (line == NULL) {
break;
}
GetLayoutLineSize(line, &line_size);
if (line_size.cy > line_height)
line_height = line_size.cy;
bounding->bottom += line_height;
if (line_size.cx > bounding->right)
bounding->right = line_size.cx;
nr_lines++;
} while (1);
// TODO: transform the bouding rectangle according to the wrting mode
OffsetRect(bounding, x, y);
return nr_lines;
}
#ifdef _MGDEVEL_MODE
BOOL GUIAPI GetLayoutLineInfo(LAYOUTLINE* line,
int* line_no, int* max_extent, int* nr_chars, int* nr_glyphs,
src/newgdi/layoutinfo.h
+3 -1
View File
@@ -52,7 +52,8 @@ struct _ShapedGlyph {
int x_off;
int y_off;
Uint32 width:24;
Uint32 width:14;
Uint32 height:14;
Uint32 is_cluster_start:1;
Uint32 hanged:2;
};
@@ -127,6 +128,7 @@ struct _LAYOUTINFO {
struct list_head lines; // the list head of lines
LOGFONT* lf_upright; // the default upright logfont
int nr_left_ucs;// the number of chars not laied out
int nr_lines; // the number of lines