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Texture-based thick lines: Minor tweaks and rename toward merging in master. Changes to allow changing AA_SIZE (disable texture path).

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This commit is contained in:
omar
2020-07-07 13:24:10 +02:00
parent b5bae9781d
commit 3a6c9907cd
6 changed files with 63 additions and 70 deletions
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85
imgui_draw.cpp
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@ -358,7 +358,7 @@ ImDrawListSharedData::ImDrawListSharedData()
ArcFastVtx[i] = ImVec2(ImCos(a), ImSin(a));
}
memset(CircleSegmentCounts, 0, sizeof(CircleSegmentCounts)); // This will be set by SetCircleSegmentMaxError()
TexUvAALines = NULL;
TexUvLines = NULL;
}
void ImDrawListSharedData::SetCircleSegmentMaxError(float max_error)
@ -681,11 +681,13 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
const int integer_thickness = (int)thickness;
const float fractional_thickness = thickness - integer_thickness;
// Do we want to draw this line using a texture? (for now, only draw integer-width lines using textures to avoid issues with the way scaling occurs)
const bool use_texture = (Flags & ImDrawListFlags_AntiAliasedLinesUseTex) && (integer_thickness < IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX) && (fractional_thickness >= -0.00001f) && (fractional_thickness <= 0.00001f);
// Do we want to draw this line using a texture?
// - For now, only draw integer-width lines using textures to avoid issues with the way scaling occurs, could be improved.
// - If AA_SIZE is not 1.0f we cannot use the texture path.
const bool use_texture = (Flags & ImDrawListFlags_AntiAliasedLinesUseTex) && (integer_thickness < IM_DRAWLIST_TEX_LINES_WIDTH_MAX) && (fractional_thickness <= 0.00001f);
// We should never hit this, because NewFrame() doesn't set ImDrawListFlags_AntiAliasedLinesUseTexData unless ImFontAtlasFlags_NoAALines is off
IM_ASSERT_PARANOID((!use_texture) || (!(_Data->Font->ContainerAtlas->Flags & ImFontAtlasFlags_NoAALines)));
// We should never hit this, because NewFrame() doesn't set ImDrawListFlags_AntiAliasedLinesUseTex unless ImFontAtlasFlags_NoBakedLines is off
IM_ASSERT_PARANOID(!use_texture || !(_Data->Font->ContainerAtlas->Flags & ImFontAtlasFlags_NoBakedLines));
const int idx_count = use_texture ? (count * 6) : (thick_line ? count * 18 : count * 12);
const int vtx_count = use_texture ? (points_count * 2) : (thick_line ? points_count * 4 : points_count * 3);
@ -693,7 +695,7 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
// Temporary buffer
// The first <points_count> items are normals at each line point, then after that there are either 2 or 4 temp points for each line point
ImVec2* temp_normals = (ImVec2*)alloca(points_count * ((thick_line && !use_texture) ? 5 : 3) * sizeof(ImVec2)); //-V630
ImVec2* temp_normals = (ImVec2*)alloca(points_count * ((use_texture || !thick_line) ? 3 : 5) * sizeof(ImVec2)); //-V630
ImVec2* temp_points = temp_normals + points_count;
// Calculate normals (tangents) for each line segment
@ -717,7 +719,7 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
// The width of the geometry we need to draw - this is essentially <thickness> pixels for the line itself, plus one pixel for AA
// We don't use AA_SIZE here because the +1 is tied to the generated texture and so alternate values won't work without changes to that code
const float half_draw_size = use_texture ? ((thickness * 0.5f) + 1) : 1.0f;
const float half_draw_size = use_texture ? ((thickness * 0.5f) + 1) : AA_SIZE;
// If line is not closed, the first and last points need to be generated differently as there are no normals to blend
if (!closed)
@ -775,10 +777,10 @@ void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32
if (use_texture)
{
// If we're using textures we only need to emit the left/right edge vertices
ImVec4 tex_uvs = _Data->TexUvAALines[integer_thickness];
ImVec4 tex_uvs = _Data->TexUvLines[integer_thickness];
if (fractional_thickness != 0.0f)
{
const ImVec4 tex_uvs_1 = _Data->TexUvAALines[integer_thickness + 1];
const ImVec4 tex_uvs_1 = _Data->TexUvLines[integer_thickness + 1];
tex_uvs.x = tex_uvs.x + (tex_uvs_1.x - tex_uvs.x) * fractional_thickness; // inlined ImLerp()
tex_uvs.y = tex_uvs.y + (tex_uvs_1.y - tex_uvs.y) * fractional_thickness;
tex_uvs.z = tex_uvs.z + (tex_uvs_1.z - tex_uvs.z) * fractional_thickness;
@ -1719,7 +1721,7 @@ ImFontAtlas::ImFontAtlas()
TexWidth = TexHeight = 0;
TexUvScale = ImVec2(0.0f, 0.0f);
TexUvWhitePixel = ImVec2(0.0f, 0.0f);
PackIdMouseCursors = PackIdAALines = -1;
PackIdMouseCursors = PackIdLines = -1;
}
ImFontAtlas::~ImFontAtlas()
@ -1747,7 +1749,7 @@ void ImFontAtlas::ClearInputData()
}
ConfigData.clear();
CustomRects.clear();
PackIdMouseCursors = PackIdAALines = -1;
PackIdMouseCursors = PackIdLines = -1;
}
void ImFontAtlas::ClearTexData()
@ -2387,27 +2389,15 @@ static void ImFontAtlasBuildRenderDefaultTexData(ImFontAtlas* atlas)
atlas->TexUvWhitePixel = ImVec2((r->X + 0.5f) * atlas->TexUvScale.x, (r->Y + 0.5f) * atlas->TexUvScale.y);
}
static void ImFontAtlasBuildRegisterAALineCustomRects(ImFontAtlas* atlas)
static void ImFontAtlasBuildRenderLinesTexData(ImFontAtlas* atlas)
{
if (atlas->Flags & ImFontAtlasFlags_NoAntiAliasedLines)
if (atlas->Flags & ImFontAtlasFlags_NoBakedLines)
return;
// The +2 here is to give space for the end caps, whilst height +1 is to accommodate the fact we have a zero-width row
atlas->PackIdAALines = atlas->AddCustomRectRegular(IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX + 2, IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX + 1);
}
static void ImFontAtlasBuildRenderAALinesTexData(ImFontAtlas* atlas)
{
IM_ASSERT(atlas->TexPixelsAlpha8 != NULL);
if (atlas->Flags & ImFontAtlasFlags_NoAntiAliasedLines)
return;
ImFontAtlasCustomRect* r = atlas->GetCustomRectByIndex(atlas->PackIdAALines);
IM_ASSERT(r->IsPacked());
// This generates a triangular shape in the texture, with the various line widths stacked on top of each other to allow interpolation between them
const int w = atlas->TexWidth;
for (unsigned int n = 0; n < IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX + 1; n++) // +1 because of the zero-width row
ImFontAtlasCustomRect* r = atlas->GetCustomRectByIndex(atlas->PackIdLines);
IM_ASSERT(r->IsPacked());
for (unsigned int n = 0; n < IM_DRAWLIST_TEX_LINES_WIDTH_MAX + 1; n++) // +1 because of the zero-width row
{
// Each line consists of at least two empty pixels at the ends, with a line of solid pixels in the middle
unsigned int y = n;
@ -2415,30 +2405,18 @@ static void ImFontAtlasBuildRenderAALinesTexData(ImFontAtlas* atlas)
unsigned int pad_left = (r->Width - line_width) / 2;
unsigned int pad_right = r->Width - (pad_left + line_width);
// Make sure we're inside the texture bounds before we start writing pixels
IM_ASSERT_PARANOID(pad_left + line_width + pad_right == r.Width);
IM_ASSERT_PARANOID(y < r.Height);
// Write each slice
unsigned char* write_ptr = &atlas->TexPixelsAlpha8[r->X + ((r->Y + y) * w)];
for (unsigned int x = 0; x < pad_left; x++)
*(write_ptr++) = 0;
for (unsigned int x = 0; x < line_width; x++)
*(write_ptr++) = 0xFF;
for (unsigned int x = 0; x < pad_right; x++)
*(write_ptr++) = 0;
IM_ASSERT(pad_left + line_width + pad_right == r->Width && y < r->Height); // Make sure we're inside the texture bounds before we start writing pixels
unsigned char* write_ptr = &atlas->TexPixelsAlpha8[r->X + ((r->Y + y) * atlas->TexWidth)];
memset(write_ptr, 0x00, pad_left);
memset(write_ptr + pad_left, 0xFF, line_width);
memset(write_ptr + pad_left + line_width, 0x00, pad_right);
// Calculate UVs for this line
ImFontAtlasCustomRect line_rect = *r;
line_rect.X += (unsigned short)(pad_left - 1);
line_rect.Y += (unsigned short)y;
line_rect.Width = (unsigned short)(line_width + 2);
line_rect.Height = 1;
ImVec2 uv0, uv1;
atlas->CalcCustomRectUV(&line_rect, &uv0, &uv1);
ImVec2 uv0 = ImVec2((float)(r->X + pad_left - 1), (float)(r->Y + y)) * atlas->TexUvScale;
ImVec2 uv1 = ImVec2((float)(r->X + pad_left + line_width + 1), (float)(r->Y + y + 1)) * atlas->TexUvScale;
float half_v = (uv0.y + uv1.y) * 0.5f; // Calculate a constant V in the middle of the row to avoid sampling artifacts
atlas->TexUvAALines[n] = ImVec4(uv0.x, half_v, uv1.x, half_v);
atlas->TexUvLines[n] = ImVec4(uv0.x, half_v, uv1.x, half_v);
}
}
@ -2454,15 +2432,22 @@ void ImFontAtlasBuildInit(ImFontAtlas* atlas)
atlas->PackIdMouseCursors = atlas->AddCustomRectRegular(2, 2);
}
ImFontAtlasBuildRegisterAALineCustomRects(atlas);
// Register texture region for thick lines
// The +2 here is to give space for the end caps, whilst height +1 is to accommodate the fact we have a zero-width row
if (atlas->PackIdLines < 0)
{
if (!(atlas->Flags & ImFontAtlasFlags_NoBakedLines))
atlas->PackIdLines = atlas->AddCustomRectRegular(IM_DRAWLIST_TEX_LINES_WIDTH_MAX + 2, IM_DRAWLIST_TEX_LINES_WIDTH_MAX + 1);
}
}
// This is called/shared by both the stb_truetype and the FreeType builder.
void ImFontAtlasBuildFinish(ImFontAtlas* atlas)
{
// Render into our custom data blocks
IM_ASSERT(atlas->TexPixelsAlpha8 != NULL);
ImFontAtlasBuildRenderDefaultTexData(atlas);
ImFontAtlasBuildRenderAALinesTexData(atlas);
ImFontAtlasBuildRenderLinesTexData(atlas);
// Register custom rectangle glyphs
for (int i = 0; i < atlas->CustomRects.Size; i++)