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gdi demo: Implement nk_gdi_rect_multi_color.

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This implements the GDI Rect Multicolor functions. This will work without
any problems when targetting Windows 2000 and up.

TODO: Fix Alpha blending. The Color Matrix does not render correctly.
This commit is contained in:
Kenney Phillis Jr 2018-10-18 18:09:29 -05:00
parent 9c2af0124d
commit 3121e6cb2a
2 changed files with 58 additions and 2 deletions
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2
demo/gdi/build.bat
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@ -3,4 +3,4 @@
rem This will use VS2015 for compiler
call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
cl /nologo /W3 /O2 /fp:fast /Gm- /Fedemo.exe main.c user32.lib gdi32.lib /link /incremental:no
cl /nologo /W3 /O2 /fp:fast /Gm- /Fedemo.exe main.c user32.lib gdi32.lib Msimg32.lib /link /incremental:no

58
demo/gdi/nuklear_gdi.h
View File

@ -209,6 +209,58 @@ nk_gdi_fill_rect(HDC dc, short x, short y, unsigned short w,
RoundRect(dc, x, y, x + w, y + h, r, r);
}
}
static void
nk_gdi_set_vertexColor(PTRIVERTEX tri, struct nk_color col)
{
tri->Red = col.r << 8;
tri->Green = col.g << 8;
tri->Blue = col.b << 8;
tri->Alpha = 0xff << 8;
}
static void
nk_gdi_rect_multi_color(HDC dc, short x, short y, unsigned short w,
unsigned short h, struct nk_color left, struct nk_color top,
struct nk_color right, struct nk_color bottom)
{
BLENDFUNCTION alphaFunction;
GRADIENT_RECT gRect;
GRADIENT_TRIANGLE gTri[2];
TRIVERTEX vt[4];
alphaFunction.BlendOp = AC_SRC_OVER;
alphaFunction.BlendFlags = 0;
alphaFunction.SourceConstantAlpha = 0;
alphaFunction.AlphaFormat = AC_SRC_ALPHA;
/* TODO: This Case Needs Repair.*/
/* Top Left Corner */
vt[0].x = x;
vt[0].y = y;
nk_gdi_set_vertexColor(&vt[0], left);
/* Top Right Corner */
vt[1].x = x+w;
vt[1].y = y;
nk_gdi_set_vertexColor(&vt[1], top);
/* Bottom Left Corner */
vt[2].x = x;
vt[2].y = y+h;
nk_gdi_set_vertexColor(&vt[2], right);
/* Bottom Right Corner */
vt[3].x = x+w;
vt[3].y = y+h;
nk_gdi_set_vertexColor(&vt[3], bottom);
gTri[0].Vertex1 = 0;
gTri[0].Vertex2 = 1;
gTri[0].Vertex3 = 2;
gTri[1].Vertex1 = 2;
gTri[1].Vertex2 = 1;
gTri[1].Vertex3 = 3;
GdiGradientFill(dc, vt, 4, gTri, 2 , GRADIENT_FILL_TRIANGLE);
AlphaBlend(gdi.window_dc, x, y, x+w, y+h,gdi.memory_dc, x, y, x+w, y+h,alphaFunction);
}
static void
nk_gdi_fill_triangle(HDC dc, short x0, short y0, short x1,
@ -420,6 +472,7 @@ static void
nk_gdi_blit(HDC dc)
{
BitBlt(dc, 0, 0, gdi.width, gdi.height, gdi.memory_dc, 0, 0, SRCCOPY);
}
GdiFont*
@ -824,7 +877,10 @@ nk_gdi_render(struct nk_color clear)
nk_gdi_stroke_curve(memory_dc, q->begin, q->ctrl[0], q->ctrl[1],
q->end, q->line_thickness, q->color);
} break;
case NK_COMMAND_RECT_MULTI_COLOR:
case NK_COMMAND_RECT_MULTI_COLOR: {
const struct nk_command_rect_multi_color *r = (const struct nk_command_rect_multi_color *)cmd;
nk_gdi_rect_multi_color(memory_dc, r->x, r->y,r->w, r->h, r->left, r->top, r->right, r->bottom);
} break;
case NK_COMMAND_IMAGE: {
const struct nk_command_image *i = (const struct nk_command_image *)cmd;
nk_gdi_draw_image(i->x, i->y, i->w, i->h, i->img, i->col);