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skia2/docs/illustrations.bmh
Cary Clark 224c700a1f sync docs up with tip of tree 
Also check in work in progress for blend modes,
round rects, and a placeholder for pictures.

One minor include change to add a parameter name
for SkBlendMode function.

TBR=reed@google.com
R=caryclark@google.com

Docs-Preview: https://skia.org/?cl=134200
Bug: skia:6898
Change-Id: I5d2a9221d61edb32d9c7edbb3193401605b2b513
Reviewed-on: https://skia-review.googlesource.com/134200
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
2018-06-27 15:47:45 +00:00

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#Topic Illustrations
#Subtopic Image_Info_Color_Type_RGB_565
#Example
#Width 415
#Height 250
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("16-bit word", 5 + 20 * 8, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
canvas->drawString("(low bits)", 5 + 20 * 1.5f, 137, paint);
canvas->drawString("(high bits)", 5 + 20 * 6.5f, 187, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("16-bit word", 5 + 20 * 8, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
canvas->drawString("(low bits)", 5 + 20 * 4, 137, paint);
canvas->drawString("(low bits)", 5 + 20 * 3, 187, paint);
canvas->drawString("(high bits)", 5 + 20 * 7, 187, paint);
canvas->drawString("(low bits)", 5 + 20 * 2, 237, paint);
canvas->drawString("(high bits)", 5 + 20 * 6, 237, paint);
canvas->drawString("(high bits)", 5 + 20 * 5, 287, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("32-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 85, paint);
canvas->drawString("(low bits)", 5 + 20 * 4, 137, paint);
canvas->drawString("(low bits)", 5 + 20 * 3, 187, paint);
canvas->drawString("(high bits)", 5 + 20 * 7, 187, paint);
canvas->drawString("(low bits)", 5 + 20 * 2, 237, paint);
canvas->drawString("(high bits)", 5 + 20 * 6, 237, paint);
canvas->drawString("(high bits)", 5 + 20 * 5, 287, paint);
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("64-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 135, paint);
for (int i = 0; i < 4; ++i) {
canvas->drawString("(low bits)", 5 + 20 * 4, 187 + i * 100, paint);
canvas->drawString("(high bits)", 5 + 20 * 4, 237 + i * 100, paint);
}
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'};
canvas->drawString(n >= 10 ? num : &num[1], xPos, yPos - 5, p);
break;
}
}
xPos += 20;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 10, yPos + 10, p);
}
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
void draw(SkCanvas* canvas) {
canvas->scale(1.25f, 1.25f);
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(10);
paint.setTextAlign(SkPaint::kCenter_Align);
canvas->drawString("128-bit word", 5 + 20 * 16, 20, paint);
canvas->drawString("little endian byte order", 5 + 20 * 4, 135, paint);
for (int i = 0; i < 4; ++i) {
canvas->drawString("(low bits)", 5 + 10 * 4, 187 + i * 100, paint);
canvas->drawString("(high bits)", 105 + 10 * 4, 237 + i * 100, paint);
}
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);
}
canvas->drawString(nums[stringIndex], x, yPos - 5, p);
if (1 == count) {
canvas->drawString(nums[stringIndex], xPos + 100, yPos - 5, p);
}
++stringIndex;
}
xPos += 9;
}
p.setColor(SK_ColorBLACK);
for (int i = 0; i < count; ++i) {
canvas->drawString(s[i], 5 + (e[i] + e[i + 1]) * 5, yPos + 10, p);
if (1 == count) {
canvas->drawString(s[i], 105 + (e[i] + e[i + 1]) * 5, yPos + 10, p);
}
}
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_Porter_Duff
#Example
#Width 480
#Height 330
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextAlign(SkPaint::kCenter_Align);
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 } ) {
canvas->drawString("&", 50, 80, dstPaint);
srcPaint.setBlendMode(blend);
canvas->drawBitmap(srcBits, 0, 0, &srcPaint);
canvas->drawString(SkBlendMode_Name(blend), 50, 100, labelPaint);
canvas->translate(80, 0);
if (SkBlendMode::kSrcOut == blend || SkBlendMode::kDstOut == blend) {
canvas->translate(-80 * 5, 100);
}
}
##
##
#Subtopic Blend_Mode_Porter_Duff_2
#Example
#Width 480
#Height 330
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextAlign(SkPaint::kCenter_Align);
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 } ) {
canvas->drawString("&", 50, 80, dstPaint);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
canvas->drawString(SkBlendMode_Name(blend), 50, 100, labelPaint);
canvas->translate(80, 0);
if (SkBlendMode::kSrcOut == blend || SkBlendMode::kDstOut == blend) {
canvas->translate(-80 * 5, 100);
}
}
##
##
#Subtopic Blend_Mode_Lighten_Darken
#Example
#Width 480
#Height 330
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextAlign(SkPaint::kCenter_Align);
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 } ) {
canvas->drawString("&", 50, 80, dstPaint);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
canvas->drawString(SkBlendMode_Name(blend), 50, 100, labelPaint);
canvas->translate(90, 0);
if (SkBlendMode::kLighten == blend || SkBlendMode::kDifference == blend) {
canvas->translate(-90 * 5, 100);
}
}
##
##
#Subtopic Blend_Mode_Color_Blends
#Example
#Width 480
#Height 110
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextAlign(SkPaint::kCenter_Align);
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 } ) {
canvas->drawString("&", 50, 80, dstPaint);
srcPaint.setBlendMode(blend);
canvas->drawPath(srcPath, srcPaint);
canvas->drawString(SkBlendMode_Name(blend), 50, 100, labelPaint);
canvas->translate(90, 0);
}
##
##
#Subtopic Blend_Mode_Modulate_Blend
#Example
#Width 480
#Height 110
SkPaint srcPaint;
srcPaint.setAntiAlias(true);
SkPaint labelPaint = srcPaint;
labelPaint.setTextAlign(SkPaint::kCenter_Align);
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 } ) {
canvas->drawString("&", 50, 80, dstPaint);
if (1 == step) {
canvas->drawBitmap(srcBits, 0, 0, &srcPaint);
canvas->drawString("Bitmap", 50, 18, labelPaint);
} else {
canvas->drawPath(srcPath, srcPaint);
canvas->drawString("Geometry", 50, 18, labelPaint);
}
canvas->drawString(SkBlendMode_Name(SkBlendMode::kModulate), 50, 100, labelPaint);
canvas->translate(120, 0);
}
##
##
#Topic Illustrations ##
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