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gdiplus: Fix hatch brush patterns that require anti-aliasing. 

Signed-off-by: Jeff Smith <whydoubt@gmail.com>
Signed-off-by: Esme Povirk <vincent@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jeff Smith 2020-06-15 09:08:45 -05:00 committed by Alexandre Julliard
parent a75584ec1b
commit d0c70facbd
4 changed files with 61 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
dlls/gdiplus/brush.c
View File

@ -197,13 +197,15 @@ GpStatus WINGDIPAPI GdipCloneBrush(GpBrush *brush, GpBrush **clone)
return Ok;
}
static const char HatchBrushes[][8] = {
/* The first 8 items per entry are bitmaps for each row of the hatch style.
* The 9th item of the entry is a flag indicating anti-aliasing. */
static const unsigned char HatchBrushes[][9] = {
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff }, /* HatchStyleHorizontal */
{ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80 }, /* HatchStyleVertical */
{ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }, /* HatchStyleForwardDiagonal */
{ 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }, /* HatchStyleBackwardDiagonal */
{ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, TRUE }, /* HatchStyleForwardDiagonal */
{ 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, TRUE }, /* HatchStyleBackwardDiagonal */
{ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xff }, /* HatchStyleCross */
{ 0x81, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x81 }, /* HatchStyleDiagonalCross */
{ 0x81, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x81, TRUE }, /* HatchStyleDiagonalCross */
{ 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x80 }, /* HatchStyle05Percent */
{ 0x00, 0x08, 0x00, 0x80, 0x00, 0x08, 0x00, 0x80 }, /* HatchStyle10Percent */
{ 0x00, 0x22, 0x00, 0x88, 0x00, 0x22, 0x00, 0x88 }, /* HatchStyle20Percent */
@ -230,7 +232,7 @@ static const char HatchBrushes[][8] = {
{ 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff }, /* HatchStyleDarkHorizontal */
};
GpStatus get_hatch_data(GpHatchStyle hatchstyle, const char **result)
GpStatus get_hatch_data(GpHatchStyle hatchstyle, const unsigned char **result)
{
if (hatchstyle < ARRAY_SIZE(HatchBrushes))
{

2
dlls/gdiplus/gdiplus_private.h
View File

@ -123,7 +123,7 @@ extern GpStatus trace_path(GpGraphics *graphics, GpPath *path) DECLSPEC_HIDDEN;
typedef struct region_element region_element;
extern void delete_element(region_element *element) DECLSPEC_HIDDEN;
extern GpStatus get_hatch_data(GpHatchStyle hatchstyle, const char **result) DECLSPEC_HIDDEN;
extern GpStatus get_hatch_data(GpHatchStyle hatchstyle, const unsigned char **result) DECLSPEC_HIDDEN;
static inline INT gdip_round(REAL x)
{

67
dlls/gdiplus/graphics.c
View File

@ -114,6 +114,19 @@ static COLORREF get_gdi_brush_color(const GpBrush *brush)
return ARGB2COLORREF(argb);
}
static ARGB blend_colors(ARGB start, ARGB end, REAL position);
static void init_hatch_palette(ARGB *hatch_palette, ARGB fore_color, ARGB back_color)
{
/* Pass the center of a 45-degree diagonal line with width of one unit through the
* center of a unit square, and the portion of the square that will be covered will
* equal sqrt(2) - 1/2. The covered portion for adjacent squares will be 1/4. */
hatch_palette[0] = back_color;
hatch_palette[1] = blend_colors(back_color, fore_color, 0.25);
hatch_palette[2] = blend_colors(back_color, fore_color, sqrt(2.0) - 0.5);
hatch_palette[3] = fore_color;
}
static HBITMAP create_hatch_bitmap(const GpHatch *hatch)
{
HBITMAP hbmp;
@ -132,18 +145,30 @@ static HBITMAP create_hatch_bitmap(const GpHatch *hatch)
hbmp = CreateDIBSection(0, (BITMAPINFO *)&bmih, DIB_RGB_COLORS, (void **)&bits, NULL, 0);
if (hbmp)
{
const char *hatch_data;
const unsigned char *hatch_data;
if (get_hatch_data(hatch->hatchstyle, &hatch_data) == Ok)
{
ARGB hatch_palette[4];
init_hatch_palette(hatch_palette, hatch->forecol, hatch->backcol);
/* Anti-aliasing is only specified for diagonal hatch patterns.
* This implementation repeats the pattern, shifts as needed,
* then uses bitmask 1 to check the pixel value, and the 0x82
* bitmask to check the adjacent pixel values, to determine the
* degree of shading needed. */
for (y = 0; y < 8; y++)
{
for (x = 0; x < 8; x++)
unsigned int row = 0x101 * hatch_data[y];
for (x = 0; x < 8; x++, row >>= 1)
{
if (hatch_data[y] & (0x80 >> x))
bits[y * 8 + x] = hatch->forecol;
int index;
if (hatch_data[8])
index = (row & 1) ? 2 : (row & 0x82) ? 1 : 0;
else
bits[y * 8 + x] = hatch->backcol;
index = (row & 1) ? 3 : 0;
bits[y * 8 + 7 - x] = hatch_palette[index];
}
}
}
@ -1160,25 +1185,33 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
{
int x, y;
GpHatch *fill = (GpHatch*)brush;
const char *hatch_data;
const unsigned char *hatch_data;
ARGB hatch_palette[4];
if (get_hatch_data(fill->hatchstyle, &hatch_data) != Ok)
return NotImplemented;
for (x=0; x<fill_area->Width; x++)
for (y=0; y<fill_area->Height; y++)
init_hatch_palette(hatch_palette, fill->forecol, fill->backcol);
/* See create_hatch_bitmap for an explanation of how index is derived. */
for (y = 0; y < fill_area->Height; y++, argb_pixels += cdwStride)
{
/* FIXME: Account for the rendering origin */
const int hy = 7 - ((y + fill_area->Y) % 8);
const unsigned int row = 0x101 * hatch_data[hy];
for (x = 0; x < fill_area->Width; x++)
{
int hx, hy;
/* FIXME: Account for the rendering origin */
hx = (x + fill_area->X) % 8;
hy = (y + fill_area->Y) % 8;
if ((hatch_data[7-hy] & (0x80 >> hx)) != 0)
argb_pixels[x + y*cdwStride] = fill->forecol;
const unsigned int srow = row >> (7 - ((x + fill_area->X) % 8));
int index;
if (hatch_data[8])
index = (srow & 1) ? 2 : (srow & 0x82) ? 1 : 0;
else
argb_pixels[x + y*cdwStride] = fill->backcol;
index = (srow & 1) ? 3 : 0;
argb_pixels[x] = hatch_palette[index];
}
}
return Ok;
}

10
dlls/gdiplus/tests/brush.c
View File

@ -1650,16 +1650,15 @@ static void test_hatchBrushStyles(void)
{
short pattern[8];
GpHatchStyle hs;
BOOL todo;
}
styles[] =
{
{ {0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0xffff}, HatchStyleHorizontal },
{ {0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xc000}, HatchStyleVertical },
{ {0x4006, 0x0019, 0x0064, 0x0190, 0x0640, 0x1900, 0x6400, 0x9001}, HatchStyleForwardDiagonal, TRUE },
{ {0x9001, 0x6400, 0x1900, 0x0640, 0x0190, 0x0064, 0x0019, 0x4006}, HatchStyleBackwardDiagonal, TRUE },
{ {0x4006, 0x0019, 0x0064, 0x0190, 0x0640, 0x1900, 0x6400, 0x9001}, HatchStyleForwardDiagonal },
{ {0x9001, 0x6400, 0x1900, 0x0640, 0x0190, 0x0064, 0x0019, 0x4006}, HatchStyleBackwardDiagonal },
{ {0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xc000, 0xffff}, HatchStyleCross },
{ {0x9006, 0x6419, 0x1964, 0x0690, 0x0690, 0x1964, 0x6419, 0x9006}, HatchStyleDiagonalCross, TRUE },
{ {0x9006, 0x6419, 0x1964, 0x0690, 0x0690, 0x1964, 0x6419, 0x9006}, HatchStyleDiagonalCross },
{ {0x0000, 0x0000, 0x0000, 0x00c0, 0x0000, 0x0000, 0x0000, 0xc000}, HatchStyle05Percent },
{ {0x0000, 0x00c0, 0x0000, 0xc000, 0x0000, 0x00c0, 0x0000, 0xc000}, HatchStyle10Percent },
{ {0x0000, 0x0c0c, 0x0000, 0xc0c0, 0x0000, 0x0c0c, 0x0000, 0xc0c0}, HatchStyle20Percent },
@ -1742,11 +1741,8 @@ static void test_hatchBrushStyles(void)
match_image = FALSE;
}
}
todo_wine_if(styles[i].todo)
{
ok(match_hdc, "Unexpected pattern for hatch style %#x with hdc.\n", styles[i].hs);
ok(match_image, "Unexpected pattern for hatch style %#x with image.\n", styles[i].hs);
}
}
status = GdipDeleteGraphics(graphics_image);