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Diffstat (limited to 'plugingui/pixelbuffer.cc')
-rw-r--r--plugingui/pixelbuffer.cc160
1 files changed, 25 insertions, 135 deletions
diff --git a/plugingui/pixelbuffer.cc b/plugingui/pixelbuffer.cc
index 827d2fc..fd02703 100644
--- a/plugingui/pixelbuffer.cc
+++ b/plugingui/pixelbuffer.cc
@@ -53,36 +53,10 @@ void PixelBuffer::realloc(std::size_t width, std::size_t height)
this->height = height;
}
-#define PX(k) ((x + y * width) * 3 + k)
-void PixelBuffer::setPixel(std::size_t x, std::size_t y, const Colour& c)
-{
- if(c.alpha() == 0)
- {
- return;
- }
-
- if(c.alpha() < 255)
- {
- unsigned int a = c.alpha();
- unsigned int b = 255 - a;
-
- std::uint8_t* pixel = &buf[PX(0)];
- *pixel = (std::uint8_t)(((int)c.red() * a + (int)*pixel * b) / 255);
- ++pixel;
- *pixel = (std::uint8_t)(((int)c.green() * a + (int)*pixel * b) / 255);
- ++pixel;
- *pixel = (std::uint8_t)(((int)c.blue() * a + (int)*pixel * b) / 255);
- }
- else
- {
- memcpy(&buf[PX(0)], c.data(), 3);
- }
-}
-
-void PixelBuffer::writeLine(std::size_t x, std::size_t y,
+void PixelBuffer::blendLine(std::size_t x, std::size_t y,
const std::uint8_t* line, std::size_t len)
{
- std::uint8_t* target = &buf[PX(0)];
+ std::uint8_t* target = buf + (x + y * width) * 3;
while(len)
{
if(line[3] == 0xff)
@@ -94,9 +68,9 @@ void PixelBuffer::writeLine(std::size_t x, std::size_t y,
unsigned int a = line[3];
unsigned int b = 255 - a;
- target[0] = (std::uint8_t)(((int)line[0] * a + (int)target[0] * b) / 255);
- target[1] = (std::uint8_t)(((int)line[1] * a + (int)target[1] * b) / 255);
- target[2] = (std::uint8_t)(((int)line[2] * a + (int)target[2] * b) / 255);
+ target[0] = (std::uint8_t)((line[0] * a + target[0] * b) / 255);
+ target[1] = (std::uint8_t)((line[1] * a + target[1] * b) / 255);
+ target[2] = (std::uint8_t)((line[2] * a + target[2] * b) / 255);
}
target += 3;
line += 4;
@@ -221,7 +195,7 @@ Rect PixelBuffer::updateBuffer(std::vector<PixelBufferAlpha*>& pixel_buffers)
for(int y = from_y; y < to_y; y++)
{
- writeLine(pixel_buffer->x + from_x,
+ blendLine(pixel_buffer->x + from_x,
pixel_buffer->y + y,
pixel_buffer->getLine(from_x, y),
to_x - from_x);
@@ -278,35 +252,10 @@ void PixelBufferAlpha::clear()
#undef PX
#define PX(k) ((x + y * width) * 4 + k)
-//void PixelBufferAlpha::setPixel(std::size_t x, std::size_t y,
-// std::uint8_t red,
-// std::uint8_t green,
-// std::uint8_t blue,
-// std::uint8_t alpha)
-//{
-// //assert(x < width);
-// //assert(y < height);
-//
-// std::uint8_t* pixel = &buf[PX(0)];
-// *pixel = red;
-// ++pixel;
-// *pixel = green;
-// ++pixel;
-// *pixel = blue;
-// ++pixel;
-// *pixel = alpha;
-//}
-
void PixelBufferAlpha::setPixel(std::size_t x, std::size_t y, const Colour& c)
{
std::uint8_t* pixel = &buf[PX(0)];
- *pixel = c.red();
- ++pixel;
- *pixel = c.green();
- ++pixel;
- *pixel = c.blue();
- ++pixel;
- *pixel = c.alpha();
+ memcpy(pixel, c.data(), 4);
}
void PixelBufferAlpha::writeLine(std::size_t x, std::size_t y,
@@ -325,45 +274,23 @@ void PixelBufferAlpha::writeLine(std::size_t x, std::size_t y,
void PixelBufferAlpha::blendLine(std::size_t x, std::size_t y,
const std::uint8_t* line, std::size_t len)
{
- auto offset = &buf[PX(0)];
if(x + y * width + len > width * height)
{
return; // out of bounds
}
- std::uint32_t* foreground = (std::uint32_t*)line;
- std::uint32_t* background = (std::uint32_t*)offset;
+ std::uint8_t* target = &buf[PX(0)];
for(std::size_t x = 0; x < len; ++x)
{
- auto Rf = *foreground & 0xff;
- auto Gf = (*foreground >> 8) & 0xff;
- auto Bf = (*foreground >> 16) & 0xff;
- auto Af = (*foreground >> 24) & 0xff;
-
- auto Rb = *background & 0xff;
- auto Gb = (*background >> 8) & 0xff;
- auto Bb = (*background >> 16) & 0xff;
- auto Ab = (*background >> 24) & 0xff;
-
- auto R = (Rf * Af)/256 + Rb;
- auto G = (Gf * Af)/256 + Gb;
- auto B = (Bf * Af)/256 + Bb;
-
- if (R > 255) R = 255;
- if (G > 255) G = 255;
- if (B > 255) B = 255;
-
-// auto a = Ab / 255.0;
-// auto b = Af / 255.0;
-// b *= (1 - a);
-
-// (Af / 255.0 * (1 - Ab / 255.0)) * 255
- auto b = Ab * (255 - Af);
-
- *background = R | (G << 8) | (B << 16) | b << 24;
+ unsigned int a = line[3];
+ unsigned int b = 255 - a;
- ++foreground;
- ++background;
+ target[0] = (std::uint8_t)((line[0] * a + target[0] * b) / 255);
+ target[1] = (std::uint8_t)((line[1] * a + target[1] * b) / 255);
+ target[2] = (std::uint8_t)((line[2] * a + target[2] * b) / 255);
+ target[3] = a * b / 255;
+ line += 4;
+ target += 4;
}
}
@@ -377,75 +304,38 @@ static inline void getAlpha(std::uint8_t _a, std::uint8_t _b,
b *= (1 - a);
}
-void PixelBufferAlpha::addPixel(std::size_t x, std::size_t y,
- std::uint8_t red,
- std::uint8_t green,
- std::uint8_t blue,
- std::uint8_t alpha)
+void PixelBufferAlpha::addPixel(std::size_t x, std::size_t y, const Colour& c)
{
- //assert(x < width);
- //assert(y < height);
-
- if(alpha == 0)
+ if(c.alpha() == 0)
{
return;
}
std::uint8_t* pixel = &buf[PX(0)];
- if(alpha < 255)
+ if(c.alpha() < 255)
{
float a, b;
- getAlpha(alpha, buf[PX(3)], a, b);
+ getAlpha(c.alpha(), buf[PX(3)], a, b);
- *pixel = (std::uint8_t)((red * a + *pixel * b) / (a + b));
+ *pixel = (std::uint8_t)((c.red() * a + *pixel * b) / (a + b));
++pixel;
- *pixel = (std::uint8_t)((green * a + *pixel * b) / (a + b));
+ *pixel = (std::uint8_t)((c.green() * a + *pixel * b) / (a + b));
++pixel;
- *pixel = (std::uint8_t)((blue * a + *pixel * b) / (a + b));
+ *pixel = (std::uint8_t)((c.blue() * a + *pixel * b) / (a + b));
++pixel;
*pixel = (a + b) * 255;
}
else
{
- *pixel = red;
- ++pixel;
- *pixel = green;
- ++pixel;
- *pixel = blue;
- ++pixel;
- *pixel = alpha;
+ memcpy(pixel, c.data(), 4);
}
}
-void PixelBufferAlpha::addPixel(std::size_t x, std::size_t y, const Colour& c)
-{
- addPixel(x, y, c.red(), c.green(), c.blue(), c.alpha());
-}
-
-void PixelBufferAlpha::pixel(std::size_t x, std::size_t y,
- std::uint8_t* red,
- std::uint8_t* green,
- std::uint8_t* blue,
- std::uint8_t* alpha) const
-{
- //assert(x < width);
- //assert(y < height);
-
- std::uint8_t* pixel = &buf[PX(0)];
- *red = *pixel;
- ++pixel;
- *green = *pixel;
- ++pixel;
- *blue = *pixel;
- ++pixel;
- *alpha = *pixel;
-}
-
const Colour& PixelBufferAlpha::pixel(std::size_t x, std::size_t y) const
{
static Colour c;
- c = Colour(buf[PX(0)], buf[PX(1)], buf[PX(2)], buf[PX(3)]);
+ memcpy(c.data(), &buf[PX(0)], 4);
return c;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 12:21:01 +0000