#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); } ## ## #Subtopic Path_Arc #Example #Height 300 #Width 600 #Function ###$ #include "SkTextOnPath.h" 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); SkPath path; path.moveTo(tl - 3 + col * 35, 103); path.lineTo(tl + 124 + col * 35, -24); SkMatrix matrix; matrix.setTranslate(0, -9); SkDrawTextOnPath(headers[col -1], strlen(headers[col -1]), bp, path, &matrix, canvas); } 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 ##