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14768f64fb
skia2/docs/illustrations.bmh
Cary Clark 14768f64fb update docs for new/changed textblob apis 
Docs-Preview: https://skia.org/?cl=165944
Bug: skia:2664
Change-Id: Ifcd112cae535501d709bc124848e2425d2ec6e5c
Reviewed-on: https://skia-review.googlesource.com/c/165944
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
2018-10-30 01:01:05 +00:00

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#Topic Illustrations
#Subtopic Image_Info_Color_Type_RGB_565
#Example
#Width 415
#Height 250
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "16-bit word", 5 + 20 * 8, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 1.5f, 137, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 6.5f, 187, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 5, 11, 16,
0, 3, 8,
0, 5, 8 };
const char* labels[] = { "red", "green", "blue" };
drawBoxText(&edges[0], &labels[0], 3, 15, 45);
drawBoxText(&edges[4], &labels[1], 2, 7, 110);
drawBoxText(&edges[7], &labels[0], 2, 7, 160);
}
##
##
#Subtopic Image_Info_Color_Type_ARGB_4444
#Example
#Width 415
#Height 250
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "16-bit word", 5 + 20 * 8, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 4, 8, 12, 16 };
const char* labels[] = { "red", "green", "blue", "alpha" };
drawBoxText(&edges[0], &labels[0], 4, 15, 45);
drawBoxText(&edges[0], &labels[2], 2, 7, 110);
drawBoxText(&edges[0], &labels[0], 2, 7, 160);
}
##
##
#Subtopic Image_Info_Color_Type_RGBA_8888
#Example
#Width 812
#Height 365
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "32-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 8, 16, 24, 32 };
const char* labels[] = { "alpha", "blue", "green", "red" };
drawBoxText(edges, &labels[0], 4, 31, 45);
drawBoxText(edges, &labels[3], 1, 7, 110);
drawBoxText(edges, &labels[2], 1, 7, 160);
drawBoxText(edges, &labels[1], 1, 7, 210);
drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##
#Subtopic Image_Info_Color_Type_RGB_888
#Example
#Width 812
#Height 365
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "32-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 8, 16, 24, 32 };
const char* labels[] = { "(unused)", "blue", "green", "red" };
drawBoxText(edges, &labels[0], 4, 31, 45);
drawBoxText(edges, &labels[3], 1, 7, 110);
drawBoxText(edges, &labels[2], 1, 7, 160);
drawBoxText(edges, &labels[1], 1, 7, 210);
drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##
#Subtopic Image_Info_Color_Type_BGRA_8888
#Example
#Width 812
#Height 365
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "32-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 8, 16, 24, 32 };
const char* labels[] = { "alpha", "red", "green", "blue" };
drawBoxText(edges, &labels[0], 4, 31, 45);
drawBoxText(edges, &labels[3], 1, 7, 110);
drawBoxText(edges, &labels[2], 1, 7, 160);
drawBoxText(edges, &labels[1], 1, 7, 210);
drawBoxText(edges, &labels[0], 1, 7, 260);
}
##
##
#Subtopic Image_Info_Color_Type_RGBA_1010102
#Example
#Width 812
#Height 380
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "32-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 4, 137, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 3, 187, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 7, 187, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 2, 237, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 6, 237, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 5, 287, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 2, 12, 22, 32,
0, 8,
0, 6, 8,
0, 4, 8,
0, 2, 8
};
const char* labels[] = { "alpha", "blue", "green", "red" };
drawBoxText(&edges[0], &labels[0], 4, 31, 45);
drawBoxText(&edges[5], &labels[3], 1, 7, 110);
drawBoxText(&edges[7], &labels[2], 2, 7, 160);
drawBoxText(&edges[10], &labels[1], 2, 7, 210);
drawBoxText(&edges[13], &labels[0], 2, 7, 260);
}
##
##
#Subtopic Image_Info_Color_Type_RGB_101010
#Example
#Width 812
#Height 380
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "32-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 85, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 4, 137, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 3, 187, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 7, 187, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 2, 237, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 6, 237, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 5, 287, paint, SkPaint::kCenter_Align);
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 2, 12, 22, 32,
0, 8,
0, 6, 8,
0, 4, 8,
0, 2, 8
};
const char* labels[] = { "unused", "blue", "green", "red" };
drawBoxText(&edges[0], &labels[0], 4, 31, 45);
drawBoxText(&edges[5], &labels[3], 1, 7, 110);
drawBoxText(&edges[7], &labels[2], 2, 7, 160);
drawBoxText(&edges[10], &labels[1], 2, 7, 210);
drawBoxText(&edges[13], &labels[0], 2, 7, 260);
}
##
##
#Subtopic Image_Info_Color_Type_RGBA_F16
#Example
#Width 812
#Height 685
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "64-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 135, paint, SkPaint::kCenter_Align);
for (int i = 0; i < 4; ++i) {
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 20 * 4, 187 + i * 100, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 5 + 20 * 4, 237 + i * 100, paint, SkPaint::kCenter_Align);
}
auto drawBoxText = [=](SkScalar e[], const char* s[], int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int width = n % 32 + 1;
int lastN = n > 32 ? 32 : 0;
for (; n >= lastN; --n) {
for (int i = 0; i <= count; ++i) {
int a = width - e[i];
if (a == n || a == n + 1 || a == n - 32 || a == n - 31) {
char num[3] = {(char) ('0' + n / 10), (char) ('0' + n % 10), '\0'};
SkTextUtils::DrawString(canvas, n >= 10 ? num : &num[1], xPos, yPos - 5, p, SkPaint::kCenter_Align);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p, SkPaint::kCenter_Align);
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 20, yPos, 5 + e[i] * 20, yPos + 15, p);
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 20, yPos + i * 15, 5 + e[count] * 20, yPos + i * 15, p);
}
};
SkScalar edges[] = { 0, 16, 32,
0, 8
};
const char* labels[] = { "alpha", "blue", "green", "red" };
drawBoxText(&edges[0], &labels[0], 2, 63, 45);
drawBoxText(&edges[0], &labels[2], 2, 31, 95);
drawBoxText(&edges[3], &labels[3], 1, 7, 160);
drawBoxText(&edges[3], &labels[3], 1, 7, 210);
drawBoxText(&edges[3], &labels[2], 1, 7, 260);
drawBoxText(&edges[3], &labels[2], 1, 7, 310);
drawBoxText(&edges[3], &labels[1], 1, 7, 360);
drawBoxText(&edges[3], &labels[1], 1, 7, 410);
drawBoxText(&edges[3], &labels[0], 1, 7, 460);
drawBoxText(&edges[3], &labels[0], 1, 7, 510);
}
##
##
#Subtopic Image_Info_Color_Type_RGBA_F32
#Example
#Width 812
#Height 685
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
SkTextUtils::DrawString(canvas, "128-bit word", 5 + 20 * 16, 20, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "little endian byte order", 5 + 20 * 4, 135, paint, SkPaint::kCenter_Align);
for (int i = 0; i < 4; ++i) {
SkTextUtils::DrawString(canvas, "(low bits)", 5 + 10 * 4, 187 + i * 100, paint, SkPaint::kCenter_Align);
SkTextUtils::DrawString(canvas, "(high bits)", 105 + 10 * 4, 237 + i * 100, paint, SkPaint::kCenter_Align);
}
auto drawBoxText = [=](SkScalar e[], const char* s[], const char* nums[] ,
int count, int n, SkScalar yPos) -> void {
SkPaint p(paint);
p.setColor(SK_ColorRED);
SkScalar xPos = 15;
int stringIndex = 0;
for (int i = n; i >= 0; --i) {
if (0 == i || n == i || 32 == i || 31 == i) {
int x = xPos;
if (2 == count) {
x += stringIndex * 12 + (stringIndex ? 8 : 0);
}
SkTextUtils::DrawString(canvas, nums[stringIndex], x, yPos - 5, p, SkPaint::kCenter_Align);
if (1 == count) {
SkTextUtils::DrawString(canvas, nums[stringIndex], xPos + 100, yPos - 5, p, SkPaint::kCenter_Align);
}
++stringIndex;
}
xPos += 9;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
SkTextUtils::DrawString(canvas, s[i], 5 + (e[i] + e[i + 1]) * 5, yPos + 10, p, SkPaint::kCenter_Align);
if (1 == count) {
SkTextUtils::DrawString(canvas, s[i], 105 + (e[i] + e[i + 1]) * 5, yPos + 10, p, SkPaint::kCenter_Align);
}
}
p.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i <= count; ++i) {
canvas->drawLine(5 + e[i] * 10, yPos, 5 + e[i] * 10, yPos + 15, p);
if (1 == count) {
canvas->drawLine(105 + e[i] * 10, yPos, 105 + e[i] * 10, yPos + 15, p);
}
}
for (int i = 0; i < 2; ++i) {
canvas->drawLine(5 + e[0] * 10, yPos + i * 15,
5 + e[count] * 10, yPos + i * 15, p);
if (1 == count) {
canvas->drawLine(105 + e[0] * 10, yPos + i * 15,
105 + e[count] * 10, yPos + i * 15, p);
}
}
};
SkScalar edges[] = { 0, 32, 64,
0, 8
};
const char* labels[] = { "alpha", "blue", "green", "red" };
const char* nums128[] = { "127", "96", "95", "64"};
const char* nums64[] = { "63", "32", "31", "0"};
const char* nums8[] = { "7", "0"};
drawBoxText(&edges[0], &labels[0], nums128, 2, 63, 45);
drawBoxText(&edges[0], &labels[2], nums64, 2, 63, 95);
drawBoxText(&edges[3], &labels[3], nums8, 1, 7, 160);
drawBoxText(&edges[3], &labels[3], nums8, 1, 7, 210);
drawBoxText(&edges[3], &labels[2], nums8, 1, 7, 260);
drawBoxText(&edges[3], &labels[2], nums8, 1, 7, 310);
drawBoxText(&edges[3], &labels[1], nums8, 1, 7, 360);
drawBoxText(&edges[3], &labels[1], nums8, 1, 7, 410);
drawBoxText(&edges[3], &labels[0], nums8, 1, 7, 460);
drawBoxText(&edges[3], &labels[0], nums8, 1, 7, 510);
}
##
##
#Subtopic Blend_Mode_Overview_Porter_Duff
#Example
#Width 480
#Height 330
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextSize(16);
SkPaint dstPaint = labelPaint;
dstPaint.setTextSize(80);
dstPaint.setColor(0xFF606080);
dstPaint.setTypeface(SkTypeface::MakeFromName("Roboto", SkFontStyle::Bold()));
SkBitmap srcBits;
srcBits.allocN32Pixels(80, 84);
SkCanvas srcCanvas(srcBits);
srcPaint.setColor(0xFFcc6633);
SkPath srcPath;
const SkPoint points[] = {{20, 20}, {80, 45}, {45, 80}};
srcPath.addPoly(points, SK_ARRAY_COUNT(points), true);
srcBits.eraseColor(0);
srcCanvas.drawPath(srcPath, srcPaint);
canvas->drawColor(0, SkBlendMode::kClear);
for (auto blend : { SkBlendMode::kSrc, SkBlendMode::kSrcATop, SkBlendMode::kSrcOver,
SkBlendMode::kSrcIn, SkBlendMode::kSrcOut,
SkBlendMode::kDst, SkBlendMode::kDstATop, SkBlendMode::kDstOver,
SkBlendMode::kDstIn, SkBlendMode::kDstOut,
SkBlendMode::kClear, SkBlendMode::kXor } ) {
SkTextUtils::DrawString(canvas, "&", 50, 80, dstPaint, SkPaint::kCenter_Align);
srcPaint.setBlendMode(blend);
canvas->drawBitmap(srcBits, 0, 0, &srcPaint);
SkTextUtils::DrawString(canvas, SkBlendMode_Name(blend), 50, 100, labelPaint, SkPaint::kCenter_Align);
canvas->translate(80, 0);
if (SkBlendMode::kSrcOut == blend || SkBlendMode::kDstOut == blend) {
canvas->translate(-80 * 5, 100);
}
}
}
##
##
#Subtopic Blend_Mode_Overview_Porter_Duff_2
#Example
#Width 480
#Height 330
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextSize(16);
SkPaint dstPaint = labelPaint;
dstPaint.setTextSize(80);
dstPaint.setColor(0xFF606080);
dstPaint.setTypeface(SkTypeface::MakeFromName("Roboto", SkFontStyle::Bold()));
srcPaint.setColor(0xFFcc6633);
SkPath srcPath;
const SkPoint points[] = {{20, 20}, {80, 45}, {45, 80}};
srcPath.addPoly(points, SK_ARRAY_COUNT(points), true);
canvas->drawColor(0, SkBlendMode::kClear);
SkBitmap dstBits;
dstBits.allocN32Pixels(80, 80);
SkCanvas dstCanvas(dstBits);
for (auto blend : { SkBlendMode::kSrc, SkBlendMode::kSrcATop, SkBlendMode::kSrcOver,
SkBlendMode::kSrcIn, SkBlendMode::kSrcOut,
SkBlendMode::kDst, SkBlendMode::kDstATop, SkBlendMode::kDstOver,
SkBlendMode::kDstIn, SkBlendMode::kDstOut,
SkBlendMode::kClear, SkBlendMode::kXor } ) {
SkTextUtils::DrawString(canvas, "&", 50, 80, dstPaint, SkPaint::kCenter_Align);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
SkTextUtils::DrawString(canvas, SkBlendMode_Name(blend), 50, 100, labelPaint, SkPaint::kCenter_Align);
canvas->translate(80, 0);
if (SkBlendMode::kSrcOut == blend || SkBlendMode::kDstOut == blend) {
canvas->translate(-80 * 5, 100);
}
}
}
##
##
#Subtopic Blend_Mode_Overview_Lighten_Darken
#Example
#Width 480
#Height 330
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextSize(16);
SkPaint dstPaint = labelPaint;
dstPaint.setTextSize(80);
dstPaint.setColor(0xFF606080);
dstPaint.setTypeface(SkTypeface::MakeFromName("Roboto", SkFontStyle::Bold()));
srcPaint.setColor(0xFFcc6633);
SkPath srcPath;
const SkPoint points[] = {{20, 20}, {80, 45}, {45, 80}};
srcPath.addPoly(points, SK_ARRAY_COUNT(points), true);
canvas->drawColor(0, SkBlendMode::kClear);
for (auto blend : { SkBlendMode::kPlus, SkBlendMode::kScreen, SkBlendMode::kOverlay,
SkBlendMode::kDarken, SkBlendMode::kLighten, SkBlendMode::kColorDodge,
SkBlendMode::kColorBurn, SkBlendMode::kHardLight, SkBlendMode::kSoftLight,
SkBlendMode::kDifference, SkBlendMode::kExclusion, SkBlendMode::kMultiply } ) {
SkTextUtils::DrawString(canvas, "&", 50, 80, dstPaint, SkPaint::kCenter_Align);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
SkTextUtils::DrawString(canvas, SkBlendMode_Name(blend), 50, 100, labelPaint, SkPaint::kCenter_Align);
canvas->translate(90, 0);
if (SkBlendMode::kLighten == blend || SkBlendMode::kDifference == blend) {
canvas->translate(-90 * 5, 100);
}
}
}
##
##
#Subtopic Blend_Mode_Overview_Color_Blends
#Example
#Width 480
#Height 110
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextSize(16);
SkPaint dstPaint = labelPaint;
dstPaint.setTextSize(80);
dstPaint.setColor(0xFF606080);
dstPaint.setTypeface(SkTypeface::MakeFromName("Roboto", SkFontStyle::Bold()));
srcPaint.setColor(0xFFcc6633);
SkPath srcPath;
const SkPoint points[] = {{20, 20}, {80, 45}, {45, 80}};
srcPath.addPoly(points, SK_ARRAY_COUNT(points), true);
canvas->drawColor(0, SkBlendMode::kClear);
for (auto blend : { SkBlendMode::kHue, SkBlendMode::kSaturation, SkBlendMode::kColor,
SkBlendMode::kLuminosity } ) {
SkTextUtils::DrawString(canvas, "&", 50, 80, dstPaint, SkPaint::kCenter_Align);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
SkTextUtils::DrawString(canvas, SkBlendMode_Name(blend), 50, 100, labelPaint,
SkPaint::kCenter_Align);
canvas->translate(90, 0);
}
}
##
##
#Subtopic Blend_Mode_Overview_Modulate_Blend
#Example
#Width 480
#Height 110
#Function
###$
#include "SkTextUtils.h"
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextSize(16);
SkPaint dstPaint = labelPaint;
dstPaint.setTextSize(80);
dstPaint.setColor(0xFF606080);
dstPaint.setTypeface(SkTypeface::MakeFromName("Roboto", SkFontStyle::Bold()));
SkBitmap srcBits;
srcBits.allocN32Pixels(80, 84);
SkCanvas srcCanvas(srcBits);
srcPaint.setColor(0xFFcc6633);
SkPath srcPath;
const SkPoint points[] = {{20, 20}, {80, 45}, {45, 80}};
srcPath.addPoly(points, SK_ARRAY_COUNT(points), true);
srcBits.eraseColor(0);
srcCanvas.drawPath(srcPath, srcPaint);
canvas->drawColor(0, SkBlendMode::kClear);
srcPaint.setBlendMode(SkBlendMode::kModulate);
for (auto step: { 1, 2 } ) {
SkTextUtils::DrawString(canvas, "&", 50, 80, dstPaint, SkPaint::kCenter_Align);
if (1 == step) {
canvas->drawBitmap(srcBits, 0, 0, &srcPaint);
SkTextUtils::DrawString(canvas, "Bitmap", 50, 18, labelPaint, SkPaint::kCenter_Align);
} else {
canvas->drawPath(srcPath, srcPaint);
SkTextUtils::DrawString(canvas, "Geometry", 50, 18, labelPaint, SkPaint::kCenter_Align);
}
SkTextUtils::DrawString(canvas, SkBlendMode_Name(SkBlendMode::kModulate), 50, 100, labelPaint,
SkPaint::kCenter_Align);
canvas->translate(120, 0);
}
}
##
##
#Subtopic Path_Arc
#Example
#Height 300
#Width 600
#Function
###$
struct data {
const char* name;
char super;
int yn[10];
};
const data dataSet[] = {
{ "arcTo sweep", '1', {1, 3, 1, 0, 0, 0, 0, 1, 0, 0 }},
{ "drawArc", 0, {1, -1, 1, 1, 1, 1, 1, 0, 0, 0 }},
{ "addArc", 0, {1, 1, 1, 4, 0, 1, 1, 1, 0, 0 }},
{ "arcTo tangents", '4', {0, 0, 0, 0, 0, 0, 0, 1, 1, 0 }},
{ "arcTo radii", '5', {1, 0, 1, 0, 0, 0, 0, 1, 1, 0 }},
{ "conicTo", 0, {1, 1, 0, 0, 0, 0, 0, 1, 1, 1 }}
};
#define __degree_symbol__ "\xC2" "\xB0"
const char* headers[] = {
"Oval part",
"force moveTo",
"can draw 180" __degree_symbol__,
"can draw 360" __degree_symbol__,
"can draw greater than 360" __degree_symbol__,
"ignored if radius is zero",
"ignored if sweep is zero",
"requires Path",
"describes rotation",
"describes perspective",
};
const char* yna[] = {
"n/a",
"no",
"yes"
};
$$$#
##
void draw(SkCanvas* canvas) {
SkPaint lp;
lp.setAntiAlias(true);
SkPaint tp(lp);
SkPaint sp(tp);
SkPaint bp(tp);
bp.setFakeBoldText(true);
sp.setTextSize(10);
lp.setColor(SK_ColorGRAY);
canvas->translate(0, 32);
const int tl = 115;
for (unsigned col = 0; col <= SK_ARRAY_COUNT(headers); ++col) {
canvas->drawLine(tl + col * 35, 100, tl + col * 35, 250, lp);
if (0 == col) {
continue;
}
canvas->drawLine( tl + col * 35, 100, tl + 100 + col * 35, 0, lp);
SkPoint pts[] = {{tl - 10.f + col * 35, 98}, {tl + 90.f + col * 35, -2}};
SkVector v = pts[1] - pts[0];
v.normalize();
SkMatrix matrix;
matrix.setSinCos(v.fY, v.fX, pts[0].fX, pts[0].fY);
canvas->save();
canvas->concat(matrix);
canvas->drawText(headers[col -1], strlen(headers[col -1]), pts[0].fX, pts[0].fY, bp);
canvas->restore();
}
for (unsigned row = 0; row <= SK_ARRAY_COUNT(dataSet); ++row) {
if (0 == row) {
canvas->drawLine(tl, 100, tl + 350, 100, lp);
} else {
canvas->drawLine(5, 100 + row * 25, tl + 350, 100 + row * 25, lp);
}
if (row == SK_ARRAY_COUNT(dataSet)) {
break;
}
canvas->drawString(dataSet[row].name, 5, 117 + row * 25, bp);
if (dataSet[row].super) {
SkScalar width = bp.measureText(dataSet[row].name, strlen(dataSet[row].name));
canvas->drawText(&dataSet[row].super, 1, 8 + width, 112 + row * 25, sp);
}
for (unsigned col = 0; col < SK_ARRAY_COUNT(headers); ++col) {
int val = dataSet[row].yn[col];
canvas->drawString(yna[SkTMin(2, val + 1)], tl + 5 + col * 35, 117 + row * 25, tp);
if (val > 1) {
char supe = '0' + val - 1;
canvas->drawText(&supe, 1, tl + 25 + col * 35, 112 + row * 25, sp);
}
}
}
}
#Example ##
##
#Topic Illustrations ##
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